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[MOD] LGA775 Support For LGA771 Xeon CPUs - Page 877

post #8761 of 12395
Yep, your problem is vdroop
post #8762 of 12395
Hi. Thanks for the quick reply.

Is there anything I can do about it at all?
post #8763 of 12395
If you have Load Line Calibration, enable it and set it to most extreme level. If not, look for pencil mods for your mobo. Otherwise, get better cooling and keep putting on the volts. My old ASRock P35 board had a massive vdroop of 0.15v volt, so it took 1.6v in BIOS to get a load voltage of 1.45v for a game-stable 3.52GHz. Of course, I had a Swiftech H220 cooling it at those volts.
post #8764 of 12395
Well I've had a look at my BIOS and I don't think I can find anything to do with LLC. There is something called CIE2 or something like that. Would that be it?
post #8765 of 12395
No that's power management (C1E). LLC is unfortunately not available on all motherboards even with the SAME chipset. For example my ASUS Striker II Extreme has LLC but my XFX 790i Ultra (both are 790i Ultra chipsets) does not. In my experience I have not had much luck with LLC anyway (although I know some others have) so I don't think you are SOL just because of that. I get a 0.064v vDroop myself. Quite normal and expected actually that's why some motherboard implement LLC.

It is easy to figure out how much to compensate though. You are basically overshooting/compensating for the vDroop so that when your CPU is under load it will be getting enough voltage (or the voltage that you initially set in the BIOS and was going for in the first place). Luckily when the CPU is at idle the higher voltage doesn't produce much heat the voltage just looks scary wink.gif

In your case (using your high/low values) would be 0.064 vDroop. It is identical to what I am getting. As mouacyk said, you can solve the problem by throwing more voltage at the chip. So you if want to run your CPU at 1.312v you would need to start at 1.376v in the BIOS. Don't be surprised if you still need to add more voltage (and end up around 1.40/1.42 in the BIOS) though just watch temps.

You'd pretty much need to throw a water block on the CPU to really see what it is capable of otherwise you are just teasing yourself rolleyes.gif.

I'm gonna show off my 2007 CPU (does it even qualify as showing off? LMAO!)
All kidding aside this is pretty high voltage.. This is AIO or custom loop territory. I wouldn't attempt voltage this high unless under water.
As you can see we have the same 0.064v vDroop battery.gif.


PS. I really don't care if I fry my chip, $60 on ebay and I've got a replacement thumb.gif (but I have been running this for well over a year now, rock solid)
post #8766 of 12395
1.472v for a year, wow! Good to hear, so I can really up mine from 1.25v at 4GHz if I want to explore some overclocking headroom or just want to push the chip in the future. It's often said that > 1.425v for 24/7 isn't healthy for 45nm but you may already be proving that wrong.
post #8767 of 12395
Quote:
Originally Posted by mouacyk View Post

1.472v for a year, wow! Good to hear, so I can really up mine from 1.25v at 4GHz if I want to explore some overclocking headroom or just want to push the chip in the future. It's often said that > 1.425v for 24/7 isn't healthy for 45nm but you may already be proving that wrong.

Unless I am just getting lucky rolleyes.gif

IMHO I just think you can't push those volts under AIR.. Under H2O it is kept much happier post-flame-small.gif

And you really do need a powerful power supply. Look at the AMPs under a full load stress test!

post #8768 of 12395
Thanks for the really informative post Laithan. Really interesting. I guess upping the voltage is a possibility but then I'm not sure if I'm comfortable with the idea of running this at 1.4 volts 24/7 in case it fries tongue.gif

There was another method mentioned called the pencil mod? I've heard about this over the years but I've never actually taken an interest in it as it never applied to me at the time. Well I guess it may now!

What is the pencil mod and how does it accomplish resolving the vdroop issue and what would the procedure be if I was to carry it out on my mobo?

Thanks!
post #8769 of 12395
Hi guys

Is not xeon inside but Q9550 e0, Using P5Q Pro latest Ket bios and 8gb ddr2 ram.

Max FSB i pull out stabile with relative low vcore is 448 for 3.8ghz. OCCT Large & Small data set stabile with cores not going over 70C max, using Cooler master V8.

My board dont have fine GTL tuning for NB and CPU, only 0.61x, 0.63x, 0.65x

When trying FSB 471 keep failing cores in stress test... is there some tweaks with NB and CPU skew clocks? I keep my performance level at 10..cant go lower, try up to 13 no luck....but i know ram is capable doing 950 mhz on 5-5-5-15-55, test it with few version of memtest and microsoft memory diagnostic tool.

Dunno, maby i swap my q9550 for E5450, hope i can get some low vid chip....my goal is to run 4.0 ghz with under 1.3 vcore
post #8770 of 12395
Quote:
Originally Posted by Dante May Cry View Post

Thanks for the really informative post Laithan. Really interesting. I guess upping the voltage is a possibility but then I'm not sure if I'm comfortable with the idea of running this at 1.4 volts 24/7 in case it fries tongue.gif

There was another method mentioned called the pencil mod? I've heard about this over the years but I've never actually taken an interest in it as it never applied to me at the time. Well I guess it may now!

What is the pencil mod and how does it accomplish resolving the vdroop issue and what would the procedure be if I was to carry it out on my mobo?

Thanks!

Google "GA-EP35-DS3 pencil mod".
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