My i7 overclocking failure

sekkai

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Specs:

i7 920 processor, d0 stepping
GIGABYTE GA-EX58-UD4P Motherboard
12 GB OCZ Gold RAM
GTX 295 Video Card
Corsair 850W PSU
Antec 1200 Full Tower Case
Prolimatech Megahalem Heatsink with AS5 thermal compound



I reset my CMOS Switch and then changed these settings:

36x QPI Linkspeed
6x Memory Multiplier
36X Uncore QPI Linkspeed
13x Uncore Frequency
Turbo Boost Tech on, Speedstep/C1E on, Turbo Performance Enhancement On


Starting off from a base clock of 133 and 1V VCore, I started raising the baseclock by intervals of 10. These were my findings:

VCore: 1, Baseclock: 143 --- boots into Windows, Prime95 runs without issue, 3 GHz achieved (143*21)
VCore: 1, Baseclock: 153 --- doesn't boot into Windows
VCore: 1.01250, Baseclock: 153 --- Bluescreened at login screen.
VCore: 1.05, Baseclock: 153 --- boots into Windows, Prime95 runs without issue, 3.212 GHz achieved (153*21)
VCore: 1.1, Baseclock: 163 --- boots into Windows, Prime95 runs without issue, 3.422 Ghz achieved (163*21)
VCore: 1.1, Baseclock: 173 --- bluescreen before login
VCore: 1.125, Baseclock: 173 --- Prime95 bluescreens upon running
VCore: 1.13750, Baseclock: 173 --- boots into Windows, Prime95 runs without issue, 3.632 Ghz achieved (173*21)
VCore: 1.2, Baseclock: 183 --- Prime95 bluescreens upon running
VCore: 1.21250, Baseclock: 183 --- boots into Windows, Prime95 runs without issue, 3.842 GHz achieved (183*21)
VCore: 1.2750, Baseclock: 193 --- boots into Windows, Prime95 runs without issue, 4.053 GHz achieved (193*21)
VCore: 1.3, Baseclock: 200 --- bluescreens upon Windows login


At the higher levels, the overvoltage lights turned green as well on my mobo.

And now for the anger-inducing part:

VCore: 1.275, Baseclock: 200 --- bluescreen
VCore: 1.25V, Baseclock: 193 --- bluescreen
VCore: 1.21250, Baseclock: 183 --- doesn't boot
VCore: 1.25, Baseclock: 183 --- doesn't boot


What on earth is going on? Did I do something incorrectly? My old setups stopped working.

I am back at default settings but with .95V right now, 2.8 GHz at load, because I'm damned scared I am going to break ***.
 

sekkai

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How do I know what VCore to use? How do I know what QPI voltage to use?

Why do I need to UP the voltage if my overvoltage lights are lighting up?
 

Gulli

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Well, ~1.25V for both QPI and CPU voltage would be a good starting point, try to see if you can go lower, I have 1.21875V on both, but I'm running at only 160bclk.
 

overshocks

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Dude you messed up, disable Turbo when overclocking, it will limit your overclocks, and read some guides before you overclock. Clearly, you are a noob, I know the truth hurts. Go read overshocked's guide
 

overshocks

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nice what hardware u using, is that temps at load?? you can keep going ur vcore isnt high at all. is that stable 24/7 tested with prime?

turbo might make it unstable when testing, most overclockers turn it off.
i would keep going if i were u if those were load temps.
 

sekkai

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My load temps are around 70-74C max load, and Prime95 ran it overnight


However I am also trying to find a good OC for my 295 NVidia card. Is it better to do a lower CPU clock with a higher GPU clock or are they independent?
 

overshocks

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i tell you this with experience anything higher than 3.8ghz on the i7 920 will not make a difference, so save some power to reduce elect bill. overclocking higher than 3.8 is just for enjoyment basically or tryin to do some record breaking

overclocking the video card is a must, but it doesnt overclock that much.

and again what hardware you use, cpu cooler

im pretty sure u got a great sample of that chip, ur vcore isnt that high for 4.2ghz

also what is your ram speed at.
 

sekkai

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RAM speed is @ 1200 at 6-6-6-18 timings. Gigabyte ud4p mobo, prolimatech megahalem heatsink with AS5 compound, antec 1200 full tower case, corsair 850w Psu


But I mean can I get better GPU results at 4.2 or 4 or 3.8?
 

overshocks

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oh, now i understand your question. the two are independent, it wouldnt matter if ur at 3.8 or 4.2

nice heatsink btw, i suggest you keep it 3.8 or 4.0 for 24/7 use to save on electricity bill

the gpu will only overclock a bit because gpus are different than cpus. unless change the gpu voltage and voiding warranty and not recommended to do that (still wont be a large overclock) so just use rivatuner. monitor gpu temps with gpu z, i think rivatuner has monitor too.

gpu temps should be under 80C for 24/7 use. the thermal shutdown is around 110C
 

sekkai

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I had my GTX clocked to some given level, and I left HL2 on to go eat dinner... I came back and my game had frozen. Restarting my computer, I kept finding that my thing would freeze after like 30s. Putting my GTX back to default worked, but I can't figure out why it'd be freezing -- it's like 50C idle!
 

overshocks

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HL2 the benchmark in 3dmark? clarify please

what is "freeze after like 30s"

freezing as in 0 fps or actually the window is frozen and you have to restart the computer

how much was the overclock, was it in the memory clock or core clock or shader clock and in what program rivatuner? temperature is not ur problem.
 

sekkai

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HL2 the game

And yes, after logging in, the computer would freeze after 30s and I'd have to restart. Lowering the GPU clocks helped.

The clock was 670/1444/1134 100fan

EVGA Precision tool used to OC
 

overshocks

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it might be a problem with the game then, try a different game. use Fraps and do some testing before and after

what is the stock clocks then since overclock is 670/1444/1134
 

sekkai

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Yeah, I just need a more certain method of stability testing the GPU clock settings.

Is it safe to be running a GTX 295 on high temps (say, 90C) for however long you need to run stability tests for?
 

overshocks

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Yes it is safe for 90C for just testing not recommended for 24/7 use, just try to keep it under 100C, because around 110C is thermal shutdown if i remember correctly.
 

sekkai

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I don't think any games run it up to 90C anyway. How long does one need to test their card for to ensure stability under OCCT GPU test?
 

overshocks

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I never used OCCT GPU test before, I just play crysis for 1 hour, if it doesn't fail then it's good. So is my suggested overclock working or not? If not then there's a problem because it's just a small overclock vs. your bigger overclock. Remember to keep in mind that GPU overclocking can't go up that much, so don't get your hopes up.