Has anyone successfully overclocked p7805u CPU?

Why don't you want to ground the pin?

 

I can't right now, my tip is too large, no proper resistor, no magnifying glass. I'm just pretty jealous only removing the resistor worked for you guys and not for me.

 

Do what I did-buy an Alienware M17x and be done. JK! I used to have a 7805u and followed this thread for a while. But you guys really KNOW your stuff cause this is waaaay over my head. I hope you all get it and, like now, I will keep checking just out of curiosity.

 

I grounded my TME pin. I never even tried to boot it with just the resistor gone.

 

How did you guys gain these soldering skills?

 

Lots of practice. I used to do a lot of smd led mods and all kinds of small electronics projects. I wouldn't recommend this as a first time soldering project. Just to let anyone considering this project know, I did this with a cheap 15w soldering iron from Radio Shack. You don't need a super fine tip soldering iron to do this one(although I'm sure it would make it easier).

 

Same here. I've done quite a few small electronics projects in the past so I'm familiar with soldering/desoldering all kinds of components. BTW, I'm using a 75w electronic controlled soldering iron with a small tip.

 

Or just buy an Extreme CPU and use throttlestop. I would be way too scared to do this kind of stuff with my laptop.

 

I don't have the spare cash to spend on an Extreme CPU, otherwise that's what I would've done. This mod is not for the faint of heart.

 

To me it feels silly to spend a lot of money on a processor that is only a bit better on the hardware scale than the one we have now just so we can receive the "privilege" of overclocking that should be inherent. Then you have a valuable processor that is essentially useless. Who would want to upgrade to a P8400?

 

Hey guys, I have uploaded the modified P78 9C.17.00 bios (based on iATA's bios collection) that has the EIST switch unlocked. It also includes the flash program and a batch file to run so all you need is to pop these files into a bootable usb stick with MSDOS, boot from the usb and run the batch file.

If all goes well then you should be able to turn the EIST on and off using the ThrottleStop program created by Unclewebb to enable the Dual IDA function to squeeze the most performance out of your CPU

P78_9C.17.00_EIST_Unlocked.zip

As always, please flash at your own risk and have a Crisis Disk ready in case something goes wrong!

To give you an idea on what's possible with a 2.26GHz P8400 CPU and Dual IDA enabled:

 

Is that stable @1V?

 

hy guies ! is that working on a packard bell ipower gx q005?? it looklike the same ... so i hope it work ^^ . i really want to overclock my q9000! so if it's good i flash the bios and it's so cool !

 

Seems like that file is corrupt or something, can't extract it with 7zip or Izarc anyway...

 

wirar extracted it just fine

 

Sorry I used the LZMA2 compression with 7zip before. I just re-uploaded it as a zip so hopefully it's easier to extract now.

 

Works now... used winrar. Thanks!

 

I guess I didn't understand it right, I'm really a newby on this stuff, but you overclocked the P8400 just with flashin a mod bios and after using only software throtlestop?

I saw 3.6 ghz on a P8400?

People with a x9100 are getting that at max!

How the temps?

I am really confused by now.

 

Hi Blackgillan, well you are partly right.
With the modified bios and throttlestop you can run the P8400 at 2.4GHz max at full load. With the original bios, the P8400 would run at 2.26GHz max at full load.
To overclock to super high clocks, you'll need to tweak memory settings, do voltage modifications on your CPU and enable overclocking by doing a hardware modification on the clock generator IC.

 

CPU-Z won't always show the actual voltage if you do a VID mod so I believe it's actually running a whole lot more than 1V, more like 1.3v, otherwise it wouldn't be stable enough to even get a screenshot at 3.6GHz!

I do notice that even with Dual IDA enabled, the voltage displayed in CPU-Z fluctuates between 1.000v and 1.138v, which I can't explain yet.

 

So, If I have the guts, do some hardware mod, soldering etc, I can throw the x9100 that I just ordered through the window, right?

I wish I knew that before!!!!

Thanks for the explanation.

 

You will still be down 3MB OF L2 Cache with the p8400 and extreme CPUs are designed to run at high speeds and should be more stable.

 

Performance: [email protected] (400Mhz FSB) > [email protected] (266Mhz FSB)
O/C setup difficulty: [email protected] (400Mhz FSB) >> [email protected] (266Mhz FSB)

 

price [email protected] <<< [email protected]

 

So, we got many dishes to choose in the menu!!!!

Congratulations to all of you that achieved these remarkable scenario.

You`re the men!!!!

 

By the way, what about temps for the 8400 @ 3.6?

Can I cook some eggs with the note?

 

Just another question, using a newby logic:

If we can increase more than 1 Ghz of a P8400, can we make a X9100 pass 4 Ghz using the same mod?

 

I don't think the P8400 is going to out perform the X9100 at the same speed. I beat my friends overclocked P8700 @ 3.2GHz with my X9000 at 3.2GHz in all the benchmarks we tried. Don't think the FSB has much impact on the performance as it is not going to bottleneck the CPU.

The difficulty of overclocking the X9100 is SUPER easy compared to the P8400 in the Gateway FXs. With throttlestop all it takes is a couple of clicks and you are done. You can adjust the FID/VID on the fly also.

You are going to be limited by heat and power when you start going that high. Some one already has a X9100 at 4GHz in a gateway FX on the coresmark leader boards.

 

I agree with xxERIKxx and Nando4. It's really super hard to get a P8400 somewhat stable at high speeds with standard cooling and plus with more cache on the X9100, it would be faster at the same speeds anyway.

 

I don't know about CPU benchmarkers, but GPU benchmarkers are crap. That is still an interesting discovery. However, the OCed FSB comes into play only when lots of memory transfers and probably communication to the video card are involved, stuff that would be reflected in real games and not in CPU benchmarks.

I still agree with you that the X9100 is better hardware than the P8400.

I'm wondering, what voltages are the stock voltages for the other Core 2 Duos like the X9100? In case any one doesn't know, the P8400 is 1.0625V for the 8.5x multi and .875V for the 6.0 multi and 133MHz FSB. I have mine undervolted to .9V 8.5x and .875V 7.5x for battery. I haven't actually tried to go lower for the 8.5x multi so it is conceivable it could go all the way down to .875V.

Edit: 8.5x @ .8875V not stable (

 

Hope I'm not tread jacking buttttt, So all this BIOS affects is EIST? Would be nice as that way in using my X9100/P7811FX I should as you mentioned be able to enable Dual IDA function in ThrottleStop. Has anyone tried this yet?

 

I tried the BIOS, flashed without a problem. Dual IDA works in throttlestop on my P8400.

 

Does having EIST off affect the ability to change voltages?

 

The voltage is locked at 1.2v when you disable EIST, im my case anyway...

 

Hmm always a compromise.

 

I guess I wasn't doing it correctly in throttlestop... seems like i can lower the voltage now, in dual IDA. It's working pretty nice so far, still testing though.

 

Good because going from .9V (in my case) to 1.2V for a 6% increase in performance would increase the power consumption by 88% on load.

 

your CPU must be much better than mine

the lowest voltage i can go is 1.1125 even though my temps are pretty nice

 

Are you sure about that? My P8400 comes stock 1.0625V, and that is the max it goes up to.

Although 8.5x is stable at .9V, I must admit that with IDA on I need .9625V to be stable, but single IDA is worthless any way.

 

maybe throttlestop doesn't read my cpu correctly... but hwinfo32 reports the same voltage and so does cpu-z

 

My P8400 has the same default voltages as lpnowlan and many others:

3.0x: 0.9250v (SLFM)
6.0x: 1.0000v
8.5x: 1.1375v
9.0x: 1.2000v (IDA)

Yours might come from a good batch of P8400's that have a lower default voltage?
Have you tried looking at the Hwinfo32 system summary screen to see if you have a different set of voltages?

 

I got HWInfo32 and looked at the voltages and they are what I described except IDA is 1.175V and I tested that voltage to see if it works and it does work but only at certain times with IDA enabled. Would perhaps my P8400 be better at overclocking? Also I thought you guys had to do a mod to bring your voltage up to 1.2. Or do you have to do the mod to enable 1.2V for other multipliers besides 9.0x?

Edit: To clarify:
6.0x: 0.8750V (SLFM)
6.0x: 1.0000V
8.5x: 1.0625V
9.0x: 1.1750V (IDA)

I use: 7.5x: .8750V, 8.5x: .9000V.

 

someone know if it work on a pb ipower gx q005 or no ?? please ^^

 

Thanks to kravis I have my 9800m overclock back. There is a lot of work that goes into getting these machines successfully overclocked, but definitely worth the effort. Thanks again to kravis and unclewebb for all the work they have done!!

 

Would this BIOS work with the P171X-FX (basicaly a pre-configured 6831?)

I'm currently running a T8300....

 

Once you have the ability to toggle EIST on and off, you will be able to use the IDA voltage with any multiplier you like.



Obviously running the IDA voltage with the 6.0 multiplier isn't very practical but I just wanted to show that it is possible. Being able to use the IDA voltage becomes a lot more practical if you are using Dual IDA mode and are also able to increase the bus speed with SetFSB.

HWiNFO32, CPU-Z and ThrottleStop should all be in agreement when it comes to VID voltages. I know there are a few ES CPUs that ThrottleStop doesn't recognize correctly as mobile CPUs but that's easy enough to fix by going into the Options... window and correcting that by selecting Core 2 Mobile CPU. The desktop CPUs use a slightly different VID formula to interpret the VID data. The difference is 0.1125 volts. If you ever see two programs reporting the VID differently by that amount then it's very likely that one program thinks your CPU is a desktop CPU when it's really a mobile CPU.

When using ThrottleStop, the trick is to set your VID voltage first, before going into Dual IDA mode. Once EIST is disabled, the CPU will get locked at whatever settings you are using. You can also use this feature to set your FID and VID to whatever values you like and then lock your CPU at that level. I don't believe that locking a 45nm CPU at a really low FID/VID pair saves you any power during normal use but if you think it does, you might be able to extend your battery life by manually disabling EIST and lock your CPU to a slow and low voltage setting.

Ultimate Destruction: You're a lucky guy. You got a low VID voltage CPU. Typically the lower voltage Core 2 CPUs are better over clockers but there's never any guarantee of that. Intel bins all their CPUs. The ones that can run reliably at a low voltage are given a low VID and thrown in the low VID bin. The majority of the mobile CPUs seem to use the same VID. On the desktop CPUs, there is a lot more variation in VID values.

 

Well I may be lucky on the CPU front, but my GPU can't overclock worth a damn compared to other people (680/1600/880 is the highest I can go.)

Lesterp66, what did you mean when you said, "Thanks to kravis I have my 9800m overclock back."? I'm hoping there is some magic potion that you pour in through the GPU vent that makes the GPU better at overclocking.

 

When i overclocked my 8400 to 2.83ghz, i lost all ability to overclock my gpu at all - even a 10mhz overclock would make it throttle and slow down, don't know why as i tried every PCIe speed under the sun with setFSB. After I flashed using kravis' modded bios and then used throttlestop to turn off eist and then kravis' modded setFSB i can run my cpu at 2.83 and overclock my 9800 again.

 

Would it benefit me at all to underclock the PCIe speed to achieve a higher overclock?

 

hey guys, I'm trying go OC my p8400 in 7811. I'm a complete noob at this. I tried autosetFSB but it didn't work. I think I found out my PPL and I get no errors when pressing set FSB but the top slider is already maxed out so I can't move it forward.
I would appreciate any tips on over-clocking my p8400.
thx in advance