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Gensou · ‎12-11-2011

Join Date: Nov 2009

i7 920 D0 + Rampage II Extreme OC
Hello,
I would like to overclock my i7 920 D0 stepping to 4.0Ghz for 24/7 use with HT on.
What settings should I start off with and there is a guide anywhere which explains what each settings does?
I've overclocked before so I'm kind of familiar with these things but the x58 is very different from the old school LGA 775 days.
I am not familiar with QPI/DRAM, PLL, QPI LInk Rate, etc.

Right now I am currently running P95 Blend test with the following settings:

191x 21 for 4020 Mhz.
CPU Voltage is set to 1.35 but CPUZ shows 1.382 while at 100% load. I believe that's called Vdroop?
DRAM Voltage is set to 1.65#
RAM Timings 8-8-8-24 (defaults)
C1E and speedstep are disabled.
I am not sure what CPU Turbo Power Limit is and what to set it to.
RAM is at 1532MHz
and UCLK or whatever it is is set to 2x that of RAM, so 3064 Mhz.
QPI Transfer rate is auto.
QPI/DRAM I am not sure what to set to. I think I just left it at auto.
Pretty much every other setting is set to auto.

Thanks.

My system:
i7 920 D0
Rampage ii extreme 2101 BIOS Rev 2.xx
Mushkin DDR3-1600 8-8-8-24 Model: 998681
Megahalem CPU Cooler with 2 88cfm yate loons in push/pull
ASUS GTX 570

HiVizMan · ‎12-12-2011

Set your ioh and ich to 1.2, your vdimm to 1.65, your cpu pll to 1.88, and your qpi/uncore to 1.35.
For D0 users set your vcore to 1.275 and for c0/c1 users set your vcore to 1.4 Bclk to 190/191 or 210/211 and multiplier to 21 and 19 respectively. Check for prime stability. D0s should be fine, but c0/c1 still may not make it, at this point your temps may be too high if you're not on water so I suggest you start working backward in order to hit a much lower vcore

SOURCE

To help us help you - please provide as much information about your system and the problem as possible.

Gensou · ‎12-12-2011

I've been messing around with it for a bit now. I've tried a lot of settings. I came to the conclusion that QPI/DRAM is the voltage that is preventing stability. I had it at 1.35 and vcore around 1.35 and up to 1.4 and I was still unstable. I dropped QPI/DRAM down to 1.2 just to see if maybe it's too high and left vcore at 1.34. I am prime stable and I ran 10 runs of LinX and I was stable. I am using 21x multiplier.

I tried keeping qpi/dram at 1.2 and lowering vcore past 1.34 but I get a BSOD.
Is there any other way I can keep 4.0GHZ and try to decrease the voltage even more?

Can I turn speedstep and C1E back on after deeming my overclock stable? Will that cause any trouble with the 21 multiplier seeing as it is turbo mode? My computer is on 24/7 and sits idle for a very long time sometimes and I think power saving features are great in my situation.