I7 920 Overclocking Question

phclyde · Jan 17, 2015

So Ive been overclocking my i7 920 with 6 gb 1600 mhz ddr3 corsair ram, a premium cooler master 212 cooler, and an evga x58 motherboard. Ive raised the base clock to hit 3.8 ghz, and it can hit that with stability. My temps with prime 95 get to 78 C highest, but when my computer is doing the most demanding task, (playing assassins creed unity), the temp only gets to 66 degrees celsius. Can I try overclocking to 4.0 ghz? Is it safe? I dont care about hitting 80 degrees C but I dont think that I would because I only hit 66 Degrees C when my computer is under the maxiumum workload I will be hitting as of now.

crisan_tiberiu · Jan 17, 2015

maybe you can hit 4 GHz, but i dont think that is worth it imho. Temps will raise more, power consumtion asweel and the performance increase from 3,8 GHz to 4 GHz is minimal.

manez · Jan 17, 2015

Meh, in my opinion you should try to squeeze every bit of performance out of from these old chips, before they become obsolete.

It's still quite safe, and the jump in temperature from 3.8 to 4.0 isn't necessary that big.
If you still want to go further, you might consider running the memory at a lower speed (thus requiring lower qpi), it will lower the temperature and allows a higher overclock. These chips will give you same performance if the memory runs at 1000mhz compared to 1800mhz.

boju · Jan 17, 2015

Thanks for that manez, i will try that, lowering the memory speed some day and see if i can get higher. I did have to lower the memory speed to achieve 3.9. Im by no way an experienced o/c and i've always wondered people with 920's hitting 4.2ghz whether they're running faster 1866 memory or clocking down.

My settings;
XMP

CPU Ratio: 20
BCLK FREQ: 195
PCIE FREQ: 100
DRAM FREQ: 1563
UCLK FREQ: 3127
QPI LINK: AUTO

______

CPU VOLTAGE: 1.25
CPU PLL: 1.88
QPI/DRAM 1.25
C1E SUPPORT: ENABLED
HT: DISABLED
A20M: DISABLED
INTEL CSTATE: DISABLED

D12 cooler as in sig. Max 76c

phclyde · Jan 17, 2015

manez :

Hey thanks for the reply. Wouldnt lowering the memory speed just speed up my processor but then weaken my ram? Would it be worth it to sacrifice ram speed for cpu speed?

manez · Jan 17, 2015

phclyde :

Only in theory, you should test this in your particular game/application. Personally I'm running my 920 @4.3ghz and ram @1243 mhz and I get identical scores in all the benchmarks I've run when comparing to running to the ram @1643mhz..

But depending on your chip, it can be A LOT easier to get 1243mhz stable.

boju · Jan 17, 2015

Found this guide might be useful. Seems some people are finding 920 more stable with odd multipliers.

Would have liked to try 21 multiplier but 20 is highest my mobo can go, so thought id try odds for both cpu and bclk ratio to reach 4ghz. Guess its something to do with turbo. Anyhow managed to get it stable for now (still testing) roughly same temps, was a little less with 1.27v @ 75c but ambient is a little cooler today.

XMP

CPU Ratio: 19
BCLK FREQ: 211
PCIE FREQ: 100
DRAM FREQ: 1269 (lowest was 1269, variance with bclk values)
UCLK FREQ: 2538
QPI LINK: AUTO

______

CPU VOLTAGE: 1.27
CPU PLL: 1.88
QPI/DRAM 1.25
C1E SUPPORT: ENABLED
HT: DISABLED
A20M: DISABLED
INTEL CSTATE: DISABLED

manez · Jan 18, 2015

Pushing uclk to about 3400 would yield a decent performance boost, basically keeping it one notch below three times the dram freq.

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