FSB downclock mod on the intel GL960 and GL40 --- useful info for PLL Modders

Introduction:
This thread explains a BSEL Mod that will allow a latest generation of Core 2 Duo processor such as the T9900 to work in a laptop equipped with an old chipset such as the Intel GL960. The mod forces the latest generation of Core 2 Duo to operate with an FSB of 800MHz (4 x 200MHz) instead of its native 1066MHz (4 x 266MHz). Applying the PLL mod as explained by moral hazard here after applying the BSEL Mod should allow re-increasing the FSB back to 1066MHz.

How is this useful:
1- The CPU will not lock at its lowest multiplier (i.e. x6).
2- This would help turn a latest generation Core 2 Duo CPU into a ULV. For instance, my T9900 was running at 2.29GHz after mod instead of the stock 3.06GHz. The T9900 was stable with a Vcore of 1.1v and the maximum temperature under orthos was between 55c and 60c.
3- Run the latest generation of Core 2 Duo at native speed or close to their native speed with a chipset that is not designed to support them.

Chipset concerned by the mod:
- Intel GL960, GM965, PM965, or GL40.
- non Intel chipsets that support FSB 800MHz.

CPU concerned by the mod:
- P7350, P7370, P7450, P7550, P7570.
- P4800, P8600, P8700, P8800.
- P9500, P9600, P9700.
- T9400, T9600, T9700, T9800, T9900.
- Q9000, Q9100.
- X9100, QX9300.

Requirements:
1- One of the above chipsets.
2- One of the above CPUs.
3- A BIOS that supports the latest generation of Core 2 Duo processors.

Testing the BIOS:
The cheapest way I know of to test the BIOS is to install a Pentium Dual Core T4*00 series or a Core 2 Duo T6*00 CPU in your laptop. The T4200 is cheap and can be bought from ebay for about £15. A BIOS that supports the above CPUs will not make your laptop freeze or refuse to boot into Windows. Thus, if your laptop freezes with the T4200 this means that your BIOS doesn't have the necessary code to detect and manage the latest generation of Core 2 Duo.

Origin of this thread:
nando4 contacted me regarding a reply I received a while ago from one of the NBR members. I don't remember who it was from so if you are this person PM me and I'll credit you. Without going into detail this member pointed out to the fact that a CPU will not lock at multiplier x6 if the BSEL Mod is applied to decrease the FSB on a laptop with an Intel chipset. You can read more about the BSEL Mod here. This means that a Core Duo or Core 2 Duo won't lock at multiplier x6 if the FSB is decreased from 800MHz -> 667MHz, 800MHz -> 533MHz, or 667MHz -> 533MHz. With an Intel chipset, the CPU will lock at multiplier x6 only when the BSEL Mod is applied to increase the FSB.

nando4 thinks lowering the FSB or forcing an FSB of 800MHz is useful as this would help operating the latest Core 2 Duo at their native or near their native speed with the help of the PLL Modon laptops with older chipsets. He suggested that this could be very helpful for the owners of the HDX9000 for instance. The above mod + the PLL mod might enable them to install the X9100, Q9000, Q9100 and QX9300 processors in their laptops.

The mod from FSB 1066MHz (4 x 266) to 800MHz (4 x 200):





List of laptops that have been successfully modded:
Acer Aspire 4315: Chipset Intel GL960 - modded by naton with a T9900, FSB from 1066 -> 800MHz.
Packard Bell Easy Note bg45-u-300: Chipset Intel GM965 - modded by rannyfash with a P7350, FSB from 1066 -> 800MHz.
Aspire Aspire 5720g: Chipset Intel GM965 - modded by niffcreature with a P7350, FSB from 1066 -> 800MHz.
Dell XPS M1530: Chipset Intel PM965 - Modded by niffcreature with a P7350, FSB 1066 -> 800MHz.
HP HDX 9000 Dragon: Chipset Intel PM965 - Modded by no-tech with an X9100, FSB from 1066 -> 800MHz, followed by overclock to 4.2GHz with ThrottleStop. You can read about it here.
Asus M50Sa: Chipset Intel PM965 - Modded by kaza with a P7350, FSB 1066 -> 800MHz.
Asus M50Sa: Chipset Intel PM965 - Modded by kaza with a X9100, FSB 1066 -> 800MHz, then overclocked to 3.5GHz.
Acer Aspire 5920G: Chipset Intel PM965 - Modded by triturbo with a X9100, FSB 1066 -> 800MHz, then overclocked to 3.6GHz.
Dell Latitude D830: Chipset Intel PM965 - Modded by trinsic nz with a X9100, FSB 1066 -> 800MHz, then overclocked to 3GHz.
Compaq CQ61-421SA: Chipset Intel GL40 - Modded by radtw78 with a P8700, FSB 1066 -> 800MHz.
CSony Vaio SZ7: Chipset Intel PM965 - Modded by treffmeister with a P8700, FSB 1066 -> 800MHz.
Acer Aspire 5920G: Chipset Intel PM965 - Modded by ergoon with a X9100, FSB 1066, FSB 1066 -> 800MHz, then overclocked to 3.2GHz.
Toshiba Satellite L305: Chipset Intel GL40 - Modded by Formula with a T9550 and E8135, FSB 1066 -> 800MHz.

List of laptops that failed to mod:
Toshiba Equium L40: tested by naton with a T4200. The laptop froze at the BIOS splash screen. This indicates that the BIOS doesn't support the latest generation of Core 2 Duo.

 

Great news! Can you confirm the CPU wasn't locked to x6 mode and if it is, can you see if Throttlestop can be used to adjust it? Your CPU-Z output shows it running at x6 only. We'd want the T9900 running at 200*11.5=2.3Ghz as a start for further investigation of applying PLL pinmods to get it running closer to it's native 266Mhz.

Can you post a screenshot showing it's a T9900 running on a GL960 chipset just to wet the appetite further?

 

I updated the first post to explain that there was no locks. The T9900 was working normally but with an FSB of 800 instead of 1066. I can't post screenshot showing the CPU running at 2.3GHz since I've already removed the mod and put back the T7500.

I run orthos and the temperatures were amazingly low. With Arctic MX-3 and an RMClock VID of 1.0v the max temperature was about 55c (ambient temperature close to 30c). A turned an expensive T9900 into an ULV CPU

 

I have two examples so fas showing the T9900 and the P7350 working on laptop with the Intel GL960 and the GM965 Chipsets.

If you tried the mod, let me know whether it worked or not for you, the name, model number and the brand of your laptop and the name of its chipset. This would help build a database of successful/unsuccessful mods.

 

Wait a minute, so....

If I can figure out how to do this, should I try a q9200 on pm965 with 800mhz FSB??


I dunno why I even asked that. I'm going to try it today.
Wish I had more than 1 pm965 chipset laptop...

 

Fitting a quad to a 965PM/965GM/GL960/GL40 being the biggest performance benefit of this mod. A QX9300 with unlocked multiplier being the ultimate available. Those have been overclocked up tp 3.8Ghz (15.2Ghz aggregate).

Also note that quad-IDA exists, so another ~266Mhz can be had across all cores on a non-extreme quad if you have a bios that can currently do dual-IDA.

So applying this mod with a quad-core opens up a new level of performance not seen on systems like a HP HDX9000, extending their usable lifespan. Of course need to do a power budget and review the cooling system to ensure the system can handle such an upgrade.

Second win being being able to fit a cheaper and more plentiful X9100 instead of a X9000. Both with unlocked multipliers.

Am interested in hearing your 800Mhz downclocked Q9200 + 965PM test results.

 

Let us know what laptop you're modding and if the mod works for you

 

Worked with p7350 on Acer Aspire 5720g (ICL50)!
Will post screenshots later.

Did NOT work with q9200.
I think there is different microcode for quads, no? I'll ask .netroller3D see if hes willing to mod it or check it out.

It could just be that the laptop doesn't have enough power or has a BIOS lockout for extreme CPUs. The fan spun up normally when the CPU got hotter.
I will try this on the XPS m1730 as well!

 

Yes for the update.

If I had to guess I would say the Q9200 didn't work because the BIOS lacks the necessary code do detect and initialise this CPU.

Let us know what happens with the Dell XPS m1730

 

The Intel Pxx00 series locks its lowest multiplier at 3, but whatever you see in the picture are the results on the newer chipset and DDR3 memory.

I'm interested about your FSB : DRAM ratio when running DDR2. That's what you're trying to change, right?

 

What?
You have gm45. This thread is about gl40, gl960 and pm965 based chipsets with 800mhz FSB...

 

If I understand correctly, what you want to do is increase the FSB in your laptop. Right?
This wont work because:
1- You have an Intel chipset, and Intel chipsets forces the CPU to lock in its lowest multiplier when the BSEL mod is applied to increase the FSB.
2- We don't know if the GM45 supports anything above FSB 1066MHz (e.g. 1333MHz).

The P9600 is a cool CPU, but with the mod you can make it even cooler . If you apply the mod as explained in the first post your CPU maximum speed will drop to 2GHz. That would reduce the heat dissipation and power consumption of your laptop considerably. If you undervolt after the mod (RMclock or ThrottleStop) you might end up with a fan less system like rannyfash with his P7350.

 

I tried a bsel mod on an SP9400 to try to get it to run at 1333MHz, fsb still ran at 1066.

 

I believe it failed because of the RAM. The newer RAM runs cooler and doesn't take as much power as older RAM. That's the only reason people with 4Gb max RAM systems are now able to install 8Gb. When you try to BSEL MOD it you want to bring up to speed both CPU and RAM.

Yes, I want to make it faster and noisier not slower and quiet (fanless, the GPU will start freaking out because they're on the same heatpipe).

I'd like to keep the 1:2 FSB to DRAM ratio. The RAM apparently can do more (it says 609 Mhz) but only if the CPU would too.
On DDR2 I think once you reach 400Mhz it's over, that'll be like top speed. So that's inconvenient for your project.

 

What makes you think that the RAM is stopping you from successfully going from FSB 1066 to 1333?
What happen when you do the mod? Can you switch your laptop ON? Can it load Windows? Does it crash with a BSOD?

There is no relationship between the amount of RAM hat can be installed in a system and the operating temperature and operating voltage of the RAM. The maximum amount of RAM that can be installed on a laptop depends on the following:
1- The maximum amount of RAM that can be detected by the BIOS.
2- The maximum amount of RAM that can be addressed by the chipset.
3- The operating system (not as important as the BIOS and chipset).

The speed of the RAM increase because it is function of the FSB too.

Okay.

Some BIOS are intelligent enough and would select the right multiplier so that the RAM doesn't overclock. When the BIOS is not clever, there are two methods to force it to select a different FSB/VRAM divider.

1- Install a PC3-6400 RAM in one of the two memory slots and the PC3-8500 in the other.
2- If you can flash your RAM, use SPDtool or ThaiphoonBurner to flash your PC3-8500 RAM and make it behave as PC3-6400 RAM.

Either methods will force the BIOS to set an FSB/DRAM multiplier to 3:5 instead of 1:2. This would make the RAM operate at 555MHz instead of 667MHz after the BSEL mod. 555MHz is closed to your RAM native speed of 533MHz and will solve the instability issue.

 

I have some doubts that 1066 to 1333 will work. I think the GM45 maximum is 1066.

 

I just noticed the thread is about dropping the FSB from 1066 to 800, I thought it was the other way around. My apologies, I will retire from this... and best of luck!

 

Yeah, I only tried it out of curiosity. Didn't expect it to work.

 

I don't think anyone would mind if you stick around since the BSEL mod ultimate goal is to boost a CPU performance. The GL40, GL960, GM965 and PM965 do not support Core 2 Duo processors that have a native FSB of 1066. Doing the BSEL mod from 1066 to 800 can help make those processors work with these chipsets. If the mod works one can up the FSB back to 1066 or close to 1066 with the PLL mod.

Even if the BSEL mod from 1066 to 1333 works with the GM45 you'll still end up with a CPU locked at multiplier x6. What I'm trying to say is that this mod is not the best for you since you want to overclock. Did you try to increase your FSB with a software like SetFSB?

 

I have FSB overclocked pm45 to 1333mhz before, but I think that was just because of the PLL.

Something of interest I found was that I could overclock an 800mhz FSB CPU to 1066mhz on pm45 with setFSB. Even if your PLL is not supported, you could potentially just record the bytes in the registers for normal operation and then use an 800mhz FSB CPU and overclock it to normal FSB on pm45.

The t6*00 series is good for this. My t6600 would run at 2.9ghz with no voltmods.

 

Can you explain the steps involved in changing SetFSB registers and what registers to change. This is useful for both the T6**0 and T4*00 CPU series.

What works on the GM45 might also work on the GL40 and GL960. Those with the GL960 should be able to use this registry hack for 533 -> 667, 667 -> 800 and 533 -> 800, and those with the GL40 can do 667 -> 800. That means that I can run my T4200 at 2.4GHz instead of 2GHz without worrying that it will lock at x6.

 

No, its not a registry hack. Its still dependent on PLL. I meant the "PLL control registers" in the 'diagnosis' tab of setfsb.

In other words, I was simply stating you can use CPUs with different FSBs to identify PLL control registers and overclock when the PLL is unsupported. I think this is what setPLL is like?
Wouldn't help if it was TME locked.

 

That's a good technique.

 

I wanttttttttttt

will X9100 + throttlestop work with unlocked multiplier on 965 chipset
somebody pleaseee try.

meanwhile I'm bombing rep now, y'all so superr!

 

Yes, we've established it will probably work now.

I tried my q9200 on the XPS m1730. No go!

Fortunately I believe both Dell and Acer have a history of locking out quad cores and extreme CPUs even on pm45 notebooks.

Also, I think I attempted to dowclock it to 667mhz instead of 800. So I'll try it again after I try a t9400 or something.

 

I've tried two CPUs (FSB 667 and 800) on a laptop equipped with the GL40 and two versions of SetFSB; I don't have any hex numbers in the "PLL Control Register". Does it meant that I can't overclock (i.e push the FSB up)?

 

You have to click "get FSB". otherwise yes you cant overclock or if it says PLL read error or something like that.

 

You should also try using RWeverything to read the PLL registers (click on the clock generator).

 

When I press on "get FSB" I got an error: "PLL Byte Error". I didn't had much luck with RW. I don't remember what was the error though. I have to try it again.

 

anyone have info or tried it on a Lenovo T61 or T61p

 

As far as I know no one has tried the mod on a Lenovo laptop. Do you mind trying it and let us know if it works.

Edit:
Try with a T4200 first. This CPU is cheap. It it works you'll know that you can go up all he way to a T9900

 

no-tech has been successful with the mod. He applied it to his HP HDX 9000 Dragon laptop. He is currently using a Core 2 Duo X9100. He managed to overclock it to 4.2GHz . You can read more about it in the like below:
http://forum.notebookreview.com/hp-envy-hdx/515212-hp-hdx-9000-dragon-owners-lounge-part-2-a-408.html#post8009193

 

Hey guyz,

nice to meet you all here! I have been watching NBR forums for quite a while and I have indeed found a lot of useful information!

So to the point now, I tried the downclock pin mod without success on a HP G7000 (GL960) laptop. The laptop was originally runing a T2370 (if I remember well) which I replaced with a T4200. T4200 runs perfectly fine and is quite cooler than the original cpu, however my ultimate goal is of course to run a X9100 to max the machine out!

Before making this step though (i.e. spending around $200 on a X9100) I decided to check whether my T4200 could be downclocked (and therefore creating very high expectations that a X9100 could be downclocked and run as well. After using a very thin IDE cable to short-circuit the necessary pin-holes the system POSTs ok and enters the BIOS (on its own - without pressing F10) where everything seems to work fine except the fact that if I exit (either saving any changes or not) after rebooting I get back to its main screen and cannot proceed to OS boot.

What do you think could the problem be? The BIOS is flashed with the very latest version (which was issued in 2010!!) modded to remove the whitelist and add SLIC. Just to eliminate any chances of short-circuit with other pins at the cpu bottom I tried both insulated and bare cables resulting into the same effect.

Any advice is very much appreciated, thanks for your time and I hope that we will manage to reach a solution because I really want to take the most out of this laptop and make it viable for a much longer time!

EDIT: I also tried the downclock mod with the T2370 getting the same results

 

I'm not entirely sure as I don't have a laptop like your at hand to play with. That said, I know something for sure. The GL960 doesn't work well on HP laptops. For instance. I had failed to upgrade an HP 6720 from a Celeron to a Dual Core. After a lot of investigation I found out that HP made two motherboards for this laptop, one for Celeron (with the GL960) and one for Dual Core CPU.

What is the FSB when the T4200 is installed in the laptop? Is it 800MHz? Does the T4200 operate at its full speed? or is it downcloked?

You cannot downclock the T2370. This CPU is set with an FSB of 533 which is the minimum supported by the GL960. So you can't go with it any lower than 1.73GHz.

 

Hey naton,

thanks for your quick response! you are one of the people here at NBR that I honestly respect!

So, this is embarrassing but I finally figured it out! It was the HDD! Oh yes!
Apparently, in order to skip opening and closing the laptop after every test I left it open without any drives on it.. and probably the bios wouldn't be able to proceed and kept doing the same thing over and over again.. After inserting my HDD it booted perfectly!

To answer your question, the T4200 was working VERY smoothly before the supposed downclock mod and it eventually runs very well after the mod. I have to point out though that there was no substantial effect after doing this mod since it was supposed to downclock at 800 MHz which is the default for this CPU.. (or am I mistaken? I short-circuited the pin-holes indicated in the first pic of this thread)..

 

The mod described in the first post will not do anything to the T4200 since this mod is designed to force FSB 800 and the T4200 default FSB is already 800MHz.

You can try to force FSB 667 which will make the T4200 behave as a low voltage CPU. With a bit of luck the temperature will be so low that the fan won't have to spin. For that you'll have to connect BSEL0 to a Vcc Pin.

 

so my thought was correct. I would try the 667 FSB but actually I am currently exhausted (I probably dismantled the laptop around 30 times just today! haha)..

Anyway, I have just ordered a P7350 which I believe will give us a more conclusive result anyway as whether there is any chance for X9100 to run or not!

 

I agree. In addition it is cheaper. Do keep me posted so I can add you experience to the successful ones. Which G7000 do you have exactly? Do you mind checking? there should be a sticker at the bottom of the laptop with its full name

Thanks

 

I hope I will have the new cpu by next week and of course I will let you know.

The laptop is a HP F7060EV (chipset GL960 as said before; bios F.35 03/29/2010 modded)

Thanks for your interest

 

There is a small error in the OP. The 5720G is PM965, not GM965. (GM965 is used in the regular 5720, without MXM.)

 

And here again, a personal thanks to "naton". Naturally, on behalf of all the "HDX Dragon owner."

After a successful test with "T4400" I immediately tried "QX9300", and "Q9200" on PM965.

My private mail to you, you've unfortunately overlooked. Here is a link of this mail. The links within the e-mail represent the beginning of the tests and are now obsolete.

Here is a summary of test results with quad on PM965.
Here only the images .......... and the text here

Maybe you have another idea. If not, then these links might help other users.

Between " test beginning with Q9200" and "preliminary test end with" QX9300 "There are many interesting articles on this topic.
I also used pictures of you, always putting your name.

 

Enabling all four cores on a Q9200/QX9300

I've PMed Unclewebb requesting assistance in identifying if MSR bits are required to enable all four quads. Though you can see at http://software.intel.com/en-us/articles/intel-64-architecture-processor-topology-enumeration/ that each logical core needs to be assigned a APIC ID to be usable. So it appears the APIC is responsible for starting all four cores. I'd suggest that the solution here would be extracting the APIC initialization code from the 8730W bios (since it supports quads) and inserting it into the HDX9000 bios.

 

Dear naton,

I think you can now add my laptop to your list of successful mods!

So let me go through the whole story; as I had told you I had a HP G7000 with GL960 motherboard.. as a person always fighting for the best I tried to disable TME on my PLL even though I didn't have the necessary tools (fine tip soldering iron etc) ending up in damaging the PLL and therefore the motherboard... SO, that opened up the chance to upgrade my mobo to a GM965 (and therefore supporting up to 8gigs of RAM as has been stated here in NBR numerous times).. and as you can imagine I wouldn't waste this chance.
Well, to keep the story short I did change the motherboard to a GM965, reflashed the bios using my old T2370 to F.35 (i.e. the version I had been using in my old mobo as well), eventually did the TME unlock mod successfully (this time soldering at another point though not to mess up with the PLL) and today I received my P7350.
I short-circuited BSEL1 to Vcc to establish 200fsb and it WORKS LIKE A CHARM. I also used Throttlestop to undervolt to 1.0V and running IntelBurnTest not only gives absolutely stable results but also made the fan hardly go off..

For the sake of argument you can have a look at the attached screenshot.

Now, I want your advice; should I go for a X9100, X9000 or anything else? Or would it just be a waste of money? I have already tried overclocking my P7350 without success, probably because of the memory being the bottleneck. To make things even clearer I have already ordered a 800MHz dimm to see how it goes.

Thank you for your time and your invaluable tips.

 

You HDX dragon owners are crazy in a good way.

I'll start reading the pm965 and pm45 spec and have a good read.

My guess is we need to try quads on as many pm965/gm965 laptops possible, then maybe one will just work...
I will also look at the ACPI and core 2 spec.

 

This is interesting:

From the core 2 quad mobile datasheet. These pins are "reserved" on dual core processors.
But I wont post more randomness before convincing myself I understand it.

 

I've made some prelim comments on how to get a quad to work on a 965PM-equipped HDX9000 here. Perhaps worth a look?

 

@niffcreature

I am delighted with this response to my post. So I also see, I do not write useless.
Every new idea is always welcome, preferably with the "Quad success."
Thank you for your work and much fun to read on further!

@nando4
Some of your contributions to remain without a response from me. That does not mean I do not notice them. On the contrary.
Each of your posts will remain in my head. For example, post " #42". (I gave you recognition for it)
Please copy this post but also in the "HDX Forum"! The user "AlphaHex" should be no missing information.
Thank you for your tireless work! Your ideas must be implemented, but some things take time.

 

For details of my test with "X9100 QHBQ Rev.E0 engineering sample" and
"X9100 SLB48 Rev.C0 OEM" on PM965 chipset go to this post.

In this paper, are then three further links. (" 1" / " 2" and " here")
These links show all the relevant information to overclock the X9100.

The page " 1" in this thread mentioned frequency of 4.2 GHz corresponds unfortunately no stable state.
"X9000" and "X9100" is thus identical to overclocking.
There is only one price advantage of the "X9100 SLB48" and a temperature advantage of the X9100 QHBQ Rev E0 "to the" X9000 ".

Sorry for my links. This is easier for me. I have to translate any text because I can not English.

 

How to read even in this post was, there is a mysterious behavior.

During my "1066 CPU tests" on PM965 I used different SocketMod.

For example, "266MHz to 200MHz" and "266MHz to 166MHz."
The reason for this was the quad test.

In each of these "SocketMod" We mapped the corresponding frequency in the BIOS and the OS correctly.

Example: X9100 multiplier 11.5
at 266MHz = 3059MHz (with PM965 is not possible)
at "SocketMod 266 to 200" = 2300MHz
at "SocketMod 266 to 166" = 1909MHz

The correction is then made with "ThrottleStop" in the OS to 3.8 GHz, for example.
What is "SocketMod" used does not matter. (only for boot)

Now to the mystery:

I swapped my CPU about 130x. (only for "quad Try")

Now I noticed a wrong frequency display in the bios.
example X9100
at "SocketMod 266 to 200" = 1909MHz
at "SocketMod 266 to 166" = 1909MHz
without "SocketMod" = 1909MHz (yes read correctly "without SocketMod"!)
(in the OS, always a correct display from 2300MHz)

My numerous studies have shown my socket behaves as a 166MHz socket.

For the correct frequency display bios I need to get a "SocketMod 166 to 200".
This is crazy.

This applies to each CPU. Also original 800MHz CPU. Only the good of the multiplier is not locked on "x6".

The OS is not interested in the "SocketMod". Here, each CPU without "SocketMod" is displayed correctly. (real 200MHz frequency)

I initially suspected the bios. Meanwhile, I think to a contact fault of my socket. Which pin is concerned, I just could not find out until now.

This bug affects my laptop in any way. Nevertheless, it is very interesting.

" nando4" or other users what you say?

 

RickiBerlin
First, I want to salute you for the intensive experimental work you described here and the HP HDX lounge. It is really amazing

Regarding one of the post you posted yesterday in the HDX lounge; a CPU is at full speed and uses its maximum Vcore when the laptop is first powered ON. This can be verified by the fact that the fan spins when one stays inside the BIOS menu for a while. The CPU speed and Vcore drops after the OS starts loading. This happens because the OS takes over the power management of the CPU from the BIOS.

Second, I find it weird that the x9100 can post with an FSB of 200 while the T9900 can't. Is it possible that there are other differences between a normal and an extreme CPU that we don't know about besides the locked an unlocked multipliers?

I think the only way to answer the above is to test with another 1066MHz FSB normal Core 2 Duo CPU such as the P7350.

Third, check below:

BSel 2 1 0 | Frequency
---- L L L | 266
---- L H L | 200
---- L H H | 166
---- L L H | 133

I'm not sure if I'm reading you correctly. Doing 166 to 200 mod means turning BSel0 to Low. That would not do anything since x9100 BSel0 is set to Low by default. Doing the 166 to 200 mod is similar to not doing the mod since this mod has no effect.

Now, doing the 200 to 166 mod is a different story. This mod turns BSel0 from Low to High. This mean that BSel-2-1-0 becomes L L H; i.e. FSB 133MHz. With this mod the x9100 max frequency should be 1.53GHz; i.e. half its original speed.