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Overclock Stability after Improved PSU

post #1 of 8
Thread Starter 
Hey guys,

I'm (obviously) new to the website, and this was my first time overclocking... but I overclocked an i5-2500k on air to 4.5 GHz, and have since added a second GPU and upgraded my PSU.

First, a small explanation: after overclocking (and stability testing with Prime 95 - 24 hours stable at 100% load), I tried benchmarking my setup on Custom PC Benchmark Suite 2007 - at the time, I ended up scoring a few hundred points LOWER on "Multitasking" than pre-overclock. I had been running a Gigabyte SOC 6870 on a 650W Silverstone (80+) PSU (As an added note, my highest temperature was 76 on one core, with RealTemp not "calibrated" ... after 24 hours).

Now I have a second 6870 in Crossfire (Gigabyte OC), and an OCZ 850W (80+ GOLD) PSU. I tried the benchmark again out of curiousity, and my score went higher than my pre-overclock score on all counts.

As it stands, my VCore needed to be set quite high for 24 hour stability on my old PSU - CPU-Z read 1.356 V or so, up to 1.368 V under load with my LLC setting. I decided it was mostly because I got a weaker chip... but now I wonder if I might be able to lower my VCore and remain stable, as this would reduce my temperatures (which aren't terrible) and increase the lifespan of my CPU.

Thoughts? I just don't want to waste hours testing to find out I won't be able to lower voltage at all.

(If anything is inaccurate it is due to being at school and all Voltage stats are from memory)
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i5-2500k GIGABYTE Z68 UD4-B3 Sapphire R9 290 Tri-X OC G. Skill Sniper 8 GB 
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Cooler Master V8 Windows 7 Professional OCZ 850W (80+ GOLD) Silverstone Raven 03 
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post #2 of 8
you could try it..it wouldn't hurt anything..that's for sure
 
Thuban Powah!
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Thuban Powah!
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post #3 of 8
+1

This game is about testing what will optimize *your* system. Have at it.

Different scenario, but a PSU changed helped clock one of my old GPU pairs considerably.

--Alex
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post #4 of 8
Thread Starter 
Thanks guys - re-evaluation of overclock voltage in progress.

For now I'm going to stick with the stability test of P95 for 24 hours....but in the future what would you recommend for a quicker stability test? Because it's only BSOD on me once, and that was under load in BF3 on my old PSU. With my current PSU, it shouldn't* happen again.

EDIT: Down 0.10 VCore, 22.5 hours stable thus far! Good sign.
Edited by cdrinkh20 - 1/26/12 at 7:57pm
Gaming Computer
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CPUMotherboardGraphicsRAM
i5-2500k GIGABYTE Z68 UD4-B3 Sapphire R9 290 Tri-X OC G. Skill Sniper 8 GB 
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Cooler Master V8 Windows 7 Professional OCZ 850W (80+ GOLD) Silverstone Raven 03 
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Cooler Master V8 Windows 7 Professional OCZ 850W (80+ GOLD) Silverstone Raven 03 
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post #5 of 8
I still use prime for long tests, but I started using Intel Burn Test (IBT) also. There's time where I've been Prime stable but IBT will crash it in under 15min. Worth a DL.
--Alex
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post #6 of 8
Thread Starter 
How long would you recommend running IBT?

It seems to vary with all the stability tests...some are fine with 2 hours on prime...some 5...some 8....others 12 or 24.
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Gaming Computer
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CPUMotherboardGraphicsRAM
i5-2500k GIGABYTE Z68 UD4-B3 Sapphire R9 290 Tri-X OC G. Skill Sniper 8 GB 
CoolingOSPowerCase
Cooler Master V8 Windows 7 Professional OCZ 850W (80+ GOLD) Silverstone Raven 03 
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post #7 of 8
How long do you need to run a stress test? For general use I would say blend overnight will catch 99% of instability. However the most important thing is that it is stable in your day to day usage. There have been, and are, cases where a system is stable during the most rigorous of stress testing but will then for no reason BSOD during web browsing.

IBT I think 50 runs with max memory usage is about as rigorous as you will need.

Although I think if you wanted to be 100% rigorous with your testing, something like 12 hours of FFT, 12 of Blend and 12 of large FFT followed by 50 runs of IBT followed by 12 hours of PCMark and a week of folding would appease even the most stringent of stability fanatics.

Lastly, unless your old PSU was utter dog turd I don't think there would be a big difference in overclocking potential. Remember that the voltage that your CPU is fed is filtered through multiple VRMs.
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post #8 of 8
Thread Starter 
Haha well all that together sounds excessive to me, as is I am quite happy with my P95 results - the only reason I think I got one BSOD over several months overclocked was because I was playing BF3 on high settings and the combined draw of my GPU and CPU at high loads might've brought forth instability of some sort.

As it stands however... I made it to 25.5 hours with 2 steps down in voltage on this PSU. Before, I had made it 22 or 23 hours 1 step below (and BSODed), and 17 or 18 hrs 2 steps below (then BSOD). To me, unless it is a pure fluke, I may be able to drop the voltage some more and remain stable past 24 hours.

EDIT: Two more voltage steps down brought me a BSOD after just one hour. Hmm.... Also, my "new", lower voltage setting that passed over 24 hours failed on 15th run of IBT. Hmm. Perhaps you are right and that it won't make a difference to my overclock. Ah well.
Edited by cdrinkh20 - 1/27/12 at 2:47pm
Gaming Computer
(8 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500k GIGABYTE Z68 UD4-B3 Sapphire R9 290 Tri-X OC G. Skill Sniper 8 GB 
CoolingOSPowerCase
Cooler Master V8 Windows 7 Professional OCZ 850W (80+ GOLD) Silverstone Raven 03 
  hide details  
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Gaming Computer
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CPUMotherboardGraphicsRAM
i5-2500k GIGABYTE Z68 UD4-B3 Sapphire R9 290 Tri-X OC G. Skill Sniper 8 GB 
CoolingOSPowerCase
Cooler Master V8 Windows 7 Professional OCZ 850W (80+ GOLD) Silverstone Raven 03 
  hide details  
Reply
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