Which PLL on TM8215??

I would like to use Clockgen to reduce the FSB and power dissipation but I need to know which model of PLL is installed on the MB of the 8215. The only information I was able to achieve is that there is a "COMO" motherboard from Acer.

Any idea about PLL brand/model?

 

Umm if your looking to downclock ur cpu, then there are much much easier ways to do so.

For one, windows can do that by itself, by setting the power options to laptop. Also, RMClock and Notebookhardwarecontrol are free utilities that do the same. No need to mess with the fsb urself, just use those.

 

As adinu stated using clockgen to underclock makes no sense, clockgen was essentially designed for overclocking not what you intend to use it for.

I would advise you as well to use RMClock to lower you cpu speed as needed. For instance whenever I am just cruising the internet or listening to music I use RMClock to lock my turion at 800mhz i.e. it will not go pass 800mhz no matter what I do, this sounds like what you want. Therefore to reinforce what was already said RMClock or NHC are what you need not clockgen.

 

If you look for my previous posts, you will find that I'm already using NHC and neither it nor RMclock are able to reduce my CPU speed (Merom T7200) below 1GHz (166MHz x 6).

I would be happy to achieve it so easily, but up to now it seems to me that the only way to reduce TDP is reduce FSB. Therefore my question still holds on.
Please help me!

 

I'm not gonna scour the entire forums for your history and program usage. If you want help, then please post everything in your post. People will not do a background search on your username to find out your specs, and what situation you are in.

Well the reason you can't get it lower is because Intel designed it so. They made a limit on how low you can downclock it, so if NHC or RMClock won't do it below that, NOTHING will.

So I'm telling you here to be happy with 1GHz, and do not expect to lower it below that with clockgen.

Also, if you want to reduce temps and whatnot, have you undervolted you cpu? That will net much greater benefits than lowering it from 1GHz to 600MHz.

 

Ok, let's start again.
I would like to reduce TDP of my notebook during normal use (almost idle, few percent of CPU load).

Using NHC, in such condition, I'm able to set at lowest 1GHz (166MHz FSB x 6 min multiplier) at 0,95V.

I already asked here if there is any way to reduce voltage, it seems not (up to now).

Multiplier also seems to be locked.

Therefore, last item to work on (I suppose) is FSB.

Ad here it comes this thread. I don't really think that FSB couldn't be lowered just because " Intel designed it so".

 

Ok fine, believe what you want. Good luck in your search.

 

Alright let me try to explain to you what is going on here. A turion 64 x2 cannot go below 800mhz because the lowest multiplier is x4.0(200mhz x 4) we cannot get it below that therefore our turions are locked at the lowest of 4.0x. Your T7200 has a LOCKED lowest multiplier of x6 (166mhz x 6)= ~1000mhz. The lowest voltage you can get you already have at 0.95v.

As for the FSB issue 166mz is what the processor was designed with it makes no sense trying to argue on this point that is how it is made.
My turion is 200mhz yours is 166mhz, as I said above it is this that controls CPU speed based on what multiplier is in use, again x6 seems to be as low as your processor can go i.e LOCKED there.

As for trying to interfere with and lower the FSB below 166mhz you can try it with clockgen but let me tell you what will happen your computer will instantly freeze and you will have to do a hard restart. How do I know this? My previous acer had an intel processor and I thought the same thing you did and tried to lower the FSB from 100mhz to 95mhz the notebook instantly locked up. However if you don't want to take our word for it you can try it yourself, mind you I take no responsibility if you damage your notebook in anyway, after all we tried to tell you...

 

Well, I was able to find the right (or almost right) PLL code and "move" FSB.
I selected the chip ICS950405, checked the flag "Ignore GSB/PCI" and set the byte 09 to 7F.

On the low side, I was able to achieve a stable operation down to 133MHz (from standard 166). It means about 20% less of power/heat, about a couple of degrees on CPU.
I was able to run system also at lower speed (120MHz) but after a while the wireless network stopped working... maybe because the out of sync between CPU and PCI buses. This would require more testing including the PCI frequency.

On the high side, I did a short test at 184Mhz (2,2GHz, about 10% more). I was forced to re-raise the CPU voltage and therefore the CPU temp under heavy load quickly exceeded 80 °C running the fan to maximum speed.

I'm not interested in overclocking, the machine is already fast enough for me.

The reduction of FSB could indeed be useful when heat/power/noise issues are important, for example when running on battery for a long time.

Thanks to Evolution and adinu for your help and support

 

One thing you have to realize tho is that lower clocks/fsb does not necessarily mean lower power consumption and heat output. As long as you are running the same amount of volts (0.95) then it doesn't matter if you're running 1GHz or 100MHz, you're still gonna have the same power draw and heat output.

That's why I was saying that it was pointless to go below 1GHz, as a slower clockspeed will not reduce power consumption and heat output. Now, if you were to lower both the clock/bus speeds and the voltage, then yes I would say it's gonna save your power and heat. But since Intel locked the lowest voltage at 0.95 volts, that won't work.

 

I could not put it any better.

I am surprised StefanoA that you got that FSB so low and the notebook remained stable, did you confirm that the FSB was infact reduced using say cpu-z or another application? You always got to check to make sure that it is not an error.
However if anything I got to give you your due for that, hope you are not causing any damage to that processor.

 

Which program/soft You used to low down Your FSB?

 

I'm really surprised: the sentence you both confirmed is not only false, is the exact opposite of truth. The power required is -in general- proportional to frequency by the square of voltage.
If you don't believe to me, I hope you will at least trust to Intel, for example read page 3 of this document.

The FSB change was real, confirmed by CPU-Z and NHC and by higher/lower CPU temperature.

@kabal
Just check first post of this thread.

As I said, I need more time to test better the reduction of FSB togheter with PCI to check if it is possible to go down to 100-120Mhz without affecting the operation of all components.

PS: I'm well aware that there is some (remote) risk of hardware damaging in doing such tests, there is no need to repeat it on every reply.

 

How did you find out that you have to change byte 09 to 7F?
I remembered reading the Service Guide of TM8204 (almost same as TM821x) and it says the clock generator is ICS954310BGLF.

Followed your instructions but the most I can get is 2.14GHz, anything FSB beyond 173MHz has no impact at all.