Cheap Processor Upgrade? - Page 16

no, it can't run stable at 80, or even 75 for that matter because the thermal protection turns on.

don't the volt mods make the temp jump to this level?

live and...

learn,

wish i'd known that when I ordered

Great thread though, I am going to get a chip to mod for fun in the future

This is one of these unexpected finds that makes these forums worthwhile, cheers

If you ground the Vid3 pin, then the temp stays within acceptable limits (under 65C). If you ground the Vid4 pin, then the temp shoots up and kicks in the thermal throttle.

I canceled the i9300 order

You showed them didn't ya

Great thread!

Some thoughts...

Swapping CPU's.
If you take your old 533MHz chipset CPU and use it in your old 400MHz i855 chipset motherboard, I thought it would still work fine, but at a much reduced speed?.? Such as a 533MHz 1.73GHz would run at 1.3GHz when used in the 400MHz i855 motherboard.

Overclocking the i855.
The Intel 855 does not support 133Mhz, but the PLL chip it uses does.
Simply because a chipset does not support a speed does not mean the chipset can not run at that speed.
If you replace the PLL chip with one that allows adjustment, you can run the 855 chipset at 133MHz, but run into problems with the overclocked bus, and lose audio. This is not a problem for those that use PCMCIA card or USB audio cards.
But the chip and motherboard have settings for 133MHz FSB.

i855 PLL chip ICS 950810 Pins 54 and 55 determine CPU FSB speed.
Currently set at 54 = is High, and 55 = Low (ground), which equals 100MHz.
If it is set at 54 = High and 55 = High, then it would be set at 133MHz CPU.
So, if we lifted IC leg 55 off ground, then jumpered it to pin leg 54..............
I have tried modding the PLL chip, but after breaking a leg off, gave up.

Couple months ago in another thread where these 855 mods were discussed, I mentioned the CPU wire trick, since I've done that with AMD mobiles in the past, but no explanation was given as to why it will not work. My thoughts were that if the CPU only could be modded (wire trick), then bus would still stay at 100MHz (PCI bus at 66MHz really).?.?

http://notebookforums.com/showthread.php?t=59256

Could those that know please explain why this mod can not work with 855 chipset (or is it simply guessing that it will not work?)

Final note. A 33% increase is good, but is also nothing in the overclocking world. Many are running 133Mhz FSB CPU's at 215MHz FSB, on air (AMD Mobile Bartons). So it is not too much to ask a CPU or chipset to overclock 33%.

Thanks for all the work done so far!!!

Yeah but how many of those bartons are confined to a 1.5 inch space with practically no cooling running through it?

Good point. Even though my Zalman 7000AlCU is almost off in my desktop, it still has a huge heatsink that dissipates heat much better than any laptop.

The main point I was trying to make was clocking the i855 chipset to 133MHz, or better yet, overclock only the CPU with wire trick if possible..

MY 745 Dothan with 1,8GHz runs ABSOLUTELY stable at 2,4GHz in my XPS - with no changes in supply voltage!!!
Temperature stable @ ~50°C at heavy games
Juergen

What voltage are you letting it use? You run Prime95 at all?


Freaking awesome. I'm gonna do this in the next month for sure. Once I sell off a few of my Xeon rigs and make some room around here I'll be pin modding.

It's kinda funny that I've been pin modding Xeons and T-Breds for about 2 years, now I get to pin mod a Dothan. haha

run prime95 for a few hours straight and tell us ur temps and stability

Ok - I will do so and tell you the results...
Juergen

2.4GHz! Awesome! What laptop is this in?

You guys are making me want to try out the 1.8GHz Dothan from my Moma's 510M in my 9300 to see if I can get 2.4GHz at stock voltage. If yes, then Moma might just find her CPU speed has dropped to 1.5GHz

Noody

...haha stomper he says it is in a xps

So, Stichl...

How's it feel to own the fastest privately owned lappy in the world?

I wanna see how superpi runs on yours... If you can beat 33 sec, you take the record:

http://www.xtremesystems.org/forums/...p/t-45514.html

he should be able too since the 2.26ghz does 36 seconds