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i7 920 C0/C1 overclocking issues

post #1 of 3
Thread Starter 
This is my first ever attempt at OC, and I've hit a wall for some reason. As the title says, my i7 920 is a C0/C1, and my mobo is the ASUS Rampage II Extreme.

After many googles and trips to Overclock.net, I took a small step up to 160 BCLK at 1.10 V vcore, auto voltages for QPI and PLL, and 1.65 V DRAM Bus.

After about an hour in Prime95, temps looked good and there were no errors or other problems. I didn't stress for very long, cause I was looking to go higher, I just wanted to make sure I wasn't cooking my chip.

Next I wanted to try a BCLK around 180, but I can't get past POST with anything over 160. I've tried upping my vcore as high as 1.4 V and still no success. I also set the QPI voltage at 1.3 V, and the PLL at 1.81 V (lowest my mobo will go), and these changes didn't have any effect.

All the information I've been able to find is for DO revision chips, so I'm just not quite sure where I should be trying to adjust my settings to get over this wall. I'm also not very familiar with what kind of ranges the PLL and QPI voltages should be in.

My memory is timed 9-9-9-24, which I entered manually in the BIOS, and my RAM is only rated 1333, so I made sure to keep the DRAM frequency below that number. I also have HT and turbo mode enabled, and load-line calibration is enabled.

Thanks in advance for any help!
Cheapo
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CPUMotherboardGraphicsRAM
i7-920 C0/C1 @ 3.88 GHz ASUS Rampage II Extreme Sapphire Radeon HD 6970 6 GB (3 x 2 GB) Corsair XMS3 1333 MHz 
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Intel 120 GB MLC SSD Sony DVD+RW Windows 7 64-bit Samsung 20" LCD 
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Cheapo
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CPUMotherboardGraphicsRAM
i7-920 C0/C1 @ 3.88 GHz ASUS Rampage II Extreme Sapphire Radeon HD 6970 6 GB (3 x 2 GB) Corsair XMS3 1333 MHz 
Hard DriveOptical DriveOSMonitor
Intel 120 GB MLC SSD Sony DVD+RW Windows 7 64-bit Samsung 20" LCD 
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Seasonic 850X 850 Watt CoolerMaster ATCS 840 Red Baron Snoopy!11!!1 
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post #2 of 3
Thread Starter 
Finally had some time to adjust my settings some more. In retrospect, I should have made single adjustments at a time to find out exactly what was tripping me up, but after a few more trips to my BIOS I am now at 3.88 GHz stable (so far, anyway).

To get here I disabled C1E, manually changed the UCLK to the lowest I could and still maintain the ratio, and the QPI to the lowest possible. I'm pretty sure it was one of these settings holding me back, because now I'm finding that I am stable with very low voltages as compared with what I was expecting I would need.

My new BCLK is at 185
UCLK 2215 MHz
QPI 6135 MHz

vCore 1.20 V
PLL 1.88 V
uCore 1.20 V
DRAM Bus 1.64 V

**These are all the minimums for my board**
IOH volts 1.11
IOH PCIE 1.55
IOH volts 1.11
IOH PCIE 1.55

Turbo mode is enabled, and HT is disabled. My hottest core has a max temp of 75C after a single iteration of the maximum stress of Intel Burn Test, and 5 iterations of the standard stress. Going to run more of the strenuous tests overnight tonight to make certain I didn't just get some flukes.

75C seems a little hot to me, but that's the limit I set myself, and I probably am being a little picky, considering my chip is C0 and that I have an unlapped TRUE with only the single included 1600 RPM fan.

But still, and maybe I just have too much hot air in my balloon, I'm really excited that I hit 3.88 GHz on the stock voltage for my chip. That's much beastlier than I dared hope for.

I will update again soon after I conclude my stress testing.
Cheapo
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7-920 C0/C1 @ 3.88 GHz ASUS Rampage II Extreme Sapphire Radeon HD 6970 6 GB (3 x 2 GB) Corsair XMS3 1333 MHz 
Hard DriveOptical DriveOSMonitor
Intel 120 GB MLC SSD Sony DVD+RW Windows 7 64-bit Samsung 20" LCD 
PowerCaseMouse Pad
Seasonic 850X 850 Watt CoolerMaster ATCS 840 Red Baron Snoopy!11!!1 
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Reply
Cheapo
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7-920 C0/C1 @ 3.88 GHz ASUS Rampage II Extreme Sapphire Radeon HD 6970 6 GB (3 x 2 GB) Corsair XMS3 1333 MHz 
Hard DriveOptical DriveOSMonitor
Intel 120 GB MLC SSD Sony DVD+RW Windows 7 64-bit Samsung 20" LCD 
PowerCaseMouse Pad
Seasonic 850X 850 Watt CoolerMaster ATCS 840 Red Baron Snoopy!11!!1 
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Reply
post #3 of 3
all guides using D0 chips will apply 100% to your setup.

the only thing that is different is that your CPU may need a bit more vcore and QPI/VTT voltage.
The 775 Legend
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The 775 Legend
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E8600 @ 5.8 -- 1.736v Rampage Formula! GTX550ti Vmod! OCZ D9's @ 1200+ cas 5 
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