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PC responsiveness: Prime95 vs x264 on 4770k

post #1 of 6
Thread Starter 
Noticed something interesting: if I run Prime95 I can still use my PC with minimal-to-no perceptible degradation in responsiveness/pefromance doing simple everyday activities such as browsing the web (10-15 tabs in Chrome), checking email, browsing files on local SDD, etc.

If I run x264 the PC becomes very perceptibly sluggish and stutter-y even though all 8 virtual cores are not always at 100% they are at during Prime95.

I find this interesting since Prime95 causes much higher temps and is deemed a more serious test of OC stability. I wonder if it's because it's using more "special" instructions which leave room for mundane activities (doesn't make sense to me)...

Curious if anyone would venture an explanation. :-)


P.S. If you are wondering why I'm using my PC during stress testing it's A. because I want to tongue.gif but -- more importantly -- B. because i think it may make for a better test. I want as much going on as possible at times of stress to ensure stability, so mixing in regular activity with synthetics seems like a good idea!
post #2 of 6
Well for one, how much RAM is Prime95 using ? For a decent all-round stress test, you'd need to set it to ~90% of your max memory. That'll punish your system and your ability to surf the internet while running Prime95 tongue.gif

As for x264, I'm not sure. I'm not really into that kind of software.

All I can say is, the loads are different. The work they're doing, the resources used, it's just not the same.
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post #3 of 6
Well prime95 allows you to normally use pc when running stability tests.For example LinX could stress my pc so much that it would lock up after like 5-8seconds. But the cpu could pass 3-4h of prime95 blend so this was not a stability issue. Some stress tests are just too stressful for the pc.Not every system can handle that much load without locking up.
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post #4 of 6
Quote:
Originally Posted by creos7 View Post

Noticed something interesting: if I run Prime95 I can still use my PC with minimal-to-no perceptible degradation in responsiveness/pefromance doing simple everyday activities such as browsing the web (10-15 tabs in Chrome), checking email, browsing files on local SDD, etc.

If I run x264 the PC becomes very perceptibly sluggish and stutter-y even though all 8 virtual cores are not always at 100% they are at during Prime95.

I find this interesting since Prime95 causes much higher temps and is deemed a more serious test of OC stability. I wonder if it's because it's using more "special" instructions which leave room for mundane activities (doesn't make sense to me)...

Curious if anyone would venture an explanation. :-)


P.S. If you are wondering why I'm using my PC during stress testing it's A. because I want to tongue.gif but -- more importantly -- B. because i think it may make for a better test. I want as much going on as possible at times of stress to ensure stability, so mixing in regular activity with synthetics seems like a good idea!

Quote:
Originally Posted by MoGTy View Post

Well for one, how much RAM is Prime95 using ? For a decent all-round stress test, you'd need to set it to ~90% of your max memory. That'll punish your system and your ability to surf the internet while running Prime95 tongue.gif

As for x264, I'm not sure. I'm not really into that kind of software.

All I can say is, the loads are different. The work they're doing, the resources used, it's just not the same.

I'd agree. P95 may be running the CPU at 100% load, but it's not stressing the RAM nearly as much.

I've had good results running custom with 80-90% of RAM and leaving ~2gb for the OS. So with 8gb, I set it to use 6gb and set it to run in 1 min. intervals. I usually launch and run a few programs as well while the test is running. I've found that if the OC is unstable, between P95 and opening a few programs, it will crash in less than 5min, usually instant. This doesn't negate the need to run a long term blend test for a 100% rock solid overclock (IMO) but it's a very good measure of stability.
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post #5 of 6
A lot of loads will lock you up at high priority (or if not, realtime)

x264 bench sets itself to high priority, if you're priming you should set it to high priority. Benchmarks - either above normal, high or realtime, depending which it is
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post #6 of 6
Thread Starter 
Quote:
Originally Posted by Cyro999 View Post

A lot of loads will lock you up at high priority (or if not, realtime)

x264 bench sets itself to high priority, if you're priming you should set it to high priority. Benchmarks - either above normal, high or realtime, depending which it is

aaah i think that's the real explanation here! because prime95 is 100% CPU all 8 (virtual) cores, but i can still watch youtube without any stuttering whereas x264 causes everything to be extremely choppy, yet cores are around 95%. I think it must be running either in realtime or very high priorty. thanks a lot, that's a very reasonable explanation!
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