Core i7/X58 Overclocking Thread

[286SX]

Another Air Cooled 4.0Ghz OC
System:

• Asus P6T Deluxe
• i7 920 [Batch 3839A606 - that's right, a 3839A worked]
• Corsair XMS 1333 3GB
• Antec 900
• Corsair 650TX
• Cooler Master V8 - knock off Arctic Silver
• Diamond 4870X2 [one core identified as disabled for some reason...]
• 1.5Tb Seagate
• 1.0Tb Seagate
• OEM Optical DVD-RW
• WinXP sp3

1) OC STABLE - 3.31 Ghz @ 1.14v
Prime95 blend stable for 9 hours with stock cooler. MaxTemps were off due to RealTemp 2.7, but read 75/76/75/75. No bios edits except BCLK set to 166.

2) OC STABLE - 3.5 Ghz @ 1.14v
Prime95 blend stable for 30 mins with V8. MaxTemps were off due to RealTemp 2.7, but read 58/58/56/56.

3) OC STABLE - 3.6 Ghz @ 1.14
Prime95 blend stable for 30 mins with V8. Temps with RealTemp 2.9 = 65/64/64/62. 3.6 is easy and stable OC with low voltage.

4) OC UNSTABLE - 3.8 @ 1.16v
Prime95 blend caused reboot under 20 minutes. Voltage too low.

5) OC FAIL - 4.0 Ghz @ 1.20v
Prime95 caused reboot in less than 2 minutes. Only BIOS changes were BLCK@200 and CPUv @ 1.2000v.

6) OC STABLE - 4.0 Ghz @ 1.325v
QPIv = 1.225v. Prime95 blend torture test @ 4.0 Ghz = 7 hours stable. DRAMf = 1223. Everything else was on Auto. I jumped from 1.2 to 1.325, so the temps were a bit high: 97/95/91/90. I had success with low voltage OC in the 3.6-3.8 range, so I am resetting CPUv to 1.3125. See below.

[attachment showing 1.325v removed]

7) HIGHEST STABLE OC - 4.0 Ghz @ 1.3125v
Reduced voltage from #6. Prime95 blend stable for 11+ hours. QPIv = 1.225v. DRAMv = 1.6v. Everything else set on Auto. Max temps are 93/92/89/87.



8) OC UNSTABLE - 4.1 Ghz @ various voltages
1.300-1.325; QPIv 1.2-1.275; PLLv 1.8-1.96. Also randomly set CPU Diff Amplitude to 800 and CPU clock skew to 100ps. Nothing would keep prime stable longer than 20 minutes. Temps were not high, but need to up CPUv to have this work in prime95. Windows boot stable, internet surf stable, CPUMark stable. No other apps tested.

9) OC UNSTABLE - 4.2 Ghz @ noted voltages
CPUv 1.323-1.350; QPIv 1.325-1.35; PLLv 1.90-1.96. As with 4.1Ghz try, also randomly set CPU Diff Amplitude to 800 and CPU clock skew to 100ps. Prime died within 5 minutes. CPUMark only worked at CPUv 1.350; QPIv 1.35; PLLv 1.96. Prime95 reboot in 1 minute. Temps were not high, but need to up CPUv to have this prime95 stable. Windows boot stable at CPUMark OK voltages and internet surf-able. No other apps tested.

Need to figure out how to get 4.1+ stable. I figure it must be something besides voltage since 4.0G works with 1.3125 - and maybe a little less, but I haven't tested 1.3000 or 1.30625 yet.

10) OC STABLE - 4020hz (201 X 20) @ 1.31875
CPUv 1.31875; QPIv 1.225; PLLv A. Prime Small for 8 hours. Yeah, I ran small, and I'm not going back to run blend

11) OC ~STABLE - 4047hz (213 X 19) @ 1.31875
CPUv 1.31875; QPIv 1.30v; PLLv 1.80. LinX 20 stable. Temps 96/96/92/90. Will update with Prime Blend later.

12) OC ~STABLE - 4066hz (214 X 19) @ 1.3125
Reduced CPUv to 3.125; QPIv 1.30v; PLLv 1.80. LinX 20 stable. Temps 97/96/91/90. Will update with Prime Blend later.

13) OC ~STABLE - 4085 (215 x 19) @ 1.3125
CPUv 3.125; QPIv 1.30v; PLLv 1.80. LinX 20 stable. Temps 98/97/93/91. Will update with Prime Blend later.

Looks like I am getting to the top of my cooler's ability. I was able to run 4.104Ghz (216 X 19), but temps got up to 99 in LinX, so I shut it off.

**NOTE** interestingly, in prime blend, temps are 10 degrees cooler than LinX. I may be able to get a higher prime blend stable OC than LinX simply due to temps...

Does that still count??

-td