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How do I "properly" stress SB?

post #1 of 20
Thread Starter 
As some of you may know already, I've been having one heck of a time with my new setup. Not in a good way either, unfortunately.

However I have found a loophole.

The problem:
If I set it higher than 4.5GHz (even 4.6GHz), no matter the voltage (4.5GHz is stable at 1.33v mind you), for some strange reason....it throttles back down to 4.5GHz or even 4.4GHz under load. This happens whether I'm using Speedstep and all that crap or not.

The solution:
It appears that ONLY LinX and IBT (using the latest Linpacks) is causing this phenomenon. I just stressed 4.8GHz for 12 hours with Prime95, forcing 3200MB of RAM usage (only have 4GB installed at the moment).

Am I doing it right? Is Prime95 (forcing 3/4 or more of the RAM doing blended tests) a good enough stress test on Sandy Bridge?
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post #2 of 20
i wanna know too. i have a 2500k bnib arriving on monday and am looking at overclocking and this is the first intel(newer) i will overclock.
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post #3 of 20
Prime 95 Blend has proven to be the best way to test SB. I use that and AIDA64 as well.

Prime 95 small FFT is not very useful for stressing SB. It seems that many systems pass small FFT just fine but fail in Blend with minutes.
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post #4 of 20
If it's linx and IBT with the new linpacks and SP1 installed then i'm going to say it's a problem with AVX. A problem i've never heard of before.

If prime works i'd go with that. Run a blend with 90% RAM useage overnight and you should be fine.
post #5 of 20
Many people when these first came out could pass linpack all day but would quickly fail with prime. I'd say prime is the better choice.

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post #6 of 20
Thread Starter 
Quote:
Originally Posted by Sheyster View Post
Prime 95 Blend has proven to be the best way to test SB. I use that and AIDA64 as well.

Prime 95 small FFT is not very useful for stressing SB. It seems that many systems pass small FFT just fine but fail in Blend with minutes.
I never use Small FFT's. I hit the "Blend" button first (so it forces the right instructions), then I hit "Custom" and force in at LEAST 3/4 of my RAM usage. I'm on 4GB of RAM currently (my other 4GB is arriving Monday), so I set it to 3200MB of RAM. So yes, I use blended.

Quote:
Originally Posted by Boyboyd View Post
If it's linx and IBT with the new linpacks and SP1 installed then i'm going to say it's a problem with AVX. A problem i've never heard of before.

If prime works i'd go with that. Run a blend with 90% RAM useage overnight and you should be fine.
See above response.

And yes, it's LinX and IBT, both using the updated Linpacks. At 4.5GHz I get like 110 GFlops. If I go to 5.0GHz, I still get 110GFLops because it throttles for some weird reason.

I THINK, (think being a keyword) that my problem MIGHT have something to do with my premature BIOS. I mean its really bad. If I force turbo, speedstep, and all that crap off....I'm locked at 3.3GHz. It won't budge. I have to use Turbo to overclock it.
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Junkyard
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post #7 of 20
i stressed mine with Prime95 blend for 1hr and didn't get a BSOD but i did with Folding, i just corrected the voltage and other bios settings and no more BSOD after 24rs of Folding.
post #8 of 20
Thread Starter 
Quote:
Originally Posted by Tunapiano View Post
i stressed mine with Prime95 blend for 1hr and didn't get a BSOD but i did with Folding, i just corrected the voltage and other bios settings and no more BSOD after 24rs of Folding.
I'd rather get it stable with Prime first . I'd hate to waste a perfectly good work unit.
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Hard DriveHard DriveOptical DriveCooling
Crucial MX100 256GB WD Green 2TB DVDRW Corsair H50 Push / Pull 
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NZXT 120mm fans strapped to stock 7970 cooler Windows 10 Pro Dell 3007WFP Dell 2007FP 
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post #9 of 20
8 hour blend is bare minimum. I've had a 4 hour blend stable clock BSOD in call of duty. I've also had an 8 hour blend stable clock fail within 5 minutes of AVX Linpack SP1 which I find to the a somewhat overkill but if you can keep temps under 75-80c it's a very fast efficient way to test stability.
    
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post #10 of 20
To me stress testing is almost pointless. I ran prime95 for 32 hours and passed, ran ibt and failed on pass 400 and something. But that system would bsod after 5 mins gaming. I had another system that couldn't pass 30mins of prime but in 2 years its never bsod or locked up. If it can play all your games and you can do what you normally do on it, its stable. Doesn't matter if it can pass 3 weeks of ibt/prime if it bsod on you during your normal operations
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