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To all those doing IBT/LinX on their Phenom II's

post #1 of 27
Thread Starter 
Last night I tried IBT/LinX for the first time...coming from a loyal Prime 95 tester.

While IBT does a good job at generating heat and stressing the cores, it does not stress the ram or NB nearly enough. I passed 10 passes of IBT @ 4125MHz on the core, 2750MHz on the NB, and 2000MHz 7-9-7 ram., and then switched over to prime 95 blend. While Prime 95 did not generate as much heat, it failed within 5 minutes. This is how I know my overclock needed more CPU-NB or vRam

Therefore IBT/LinX cannot be accurately used to guage stability on Phenom II's.
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post #2 of 27
how can you isolate that to phenom II's? how do you know it isn't just the six cores?

what settings did you use for linX? I passed 12 hours of prime and failed within 5 minutes of starting up LinX. so you can't say that LinX doesn't stress you enough.
post #3 of 27
Quote:
Originally Posted by thrasherht View Post
how can you isolate that to phenom ii's? How do you know it isn't just the six cores?

What settings did you use for linx? I passed 12 hours of prime and failed within 5 minutes of starting up linx. So you can't say that linx doesn't stress you enough.
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post #4 of 27
Thread Starter 
Quote:
Originally Posted by thrasherht View Post
how can you isolate that to phenom II's? how do you know it isn't just the six cores?

what settings did you use for linX? I passed 12 hours of prime and failed within 5 minutes of starting up LinX. so you can't say that LinX doesn't stress you enough.
It stresses the cores. That quick failure was probably do to not enough voltage. IBT will pick up on core variances very fast.

At the start of prime 95 blend it is testing the ram (large FFT's) so the cpu won't be stressed enough till it gets down to 8K small FFT's. I found my 3HR prime 95 stable overclock failed when I did IBT at first too, but it needed a slight bump in voltage, and it's fine now.

It doesnt stress NB and ram, trust me on that one. I can run the most ridiculous ram settings as long as my cores are stable in IBT, and it will pass.
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post #5 of 27
Quote:
Originally Posted by Slappa View Post
It stresses the cores. That quick failure was probably do to not enough voltage. IBT will pick up on core variances very fast.

At the start of prime 95 blend it is testing the ram (large FFT's) so the cpu won't be stressed enough till it gets down to 8K small FFT's. I found my 3HR prime 95 stable overclock failed when I did IBT at first too, but it needed a slight bump in voltage, and it's fine now.

It doesnt stress NB and ram, trust me on that one. I can run the most ridiculous ram settings as long as my cores are stable in IBT, and it will pass.
so the fact that it uses a set ram amount and the fact that it uses well over 6gb of my ram means it doesn't use the Ram?

LinX does math calculations and uses the ram as storage for the problems, so it have to constantly run data between the CPU and RAM.

You still haven't told us what settings you are using for LinX. If you are running on standard settings then yea you aren't going to use that much ram, but you haven't told us.

So quit telling me how bad it is, and tell me the information so we can actually sort this out so other people can get useful information instead of listening to people blow smoke out their butt.
post #6 of 27
Happened to me too. 50 passes(LinX) OK, P95-blend fail in 2min.
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post #7 of 27
Isn't this how you are supposed to stress test? Linx/IBT stresses your CPU for the most part, Prime95 Blend is for the whole system, Memtest for your memory etc. etc. You can't say your computer is 100% stable if you haven't run 100% of the tests.
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post #8 of 27
~~~~News Flash~~~~

LinX/IBT stresses the chips FP.

Prime95 stresses a different part.

Before SP1 I was getting around 70 GFlops. SP1 enabled the AVX instruction set which doubled the FP on my chip from 128bit to 256bit. The result was nearly double the throughput on my chip.

After SP1:




Using IBT or LinX with sandy bridge is folly, it will run several voltage notches lower stable in IBT without BSOD, but it will die within the first 5 minutes of Prime 95 small fft.

Whats the point? The point is you need to run multiple stress tests that hit different parts of the chip. I needed slightly more voltage for prime than I did IBT, and I needed slightly more voltage to fold than I did for prime.

There is no one test to rule them all, it takes a combination of tests to ensure nearer to 100% stability, and even then it's not 100%.
Edited by BallaTheFeared - 1/21/11 at 3:12pm
    
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post #9 of 27
Quote:
Originally Posted by BallaTheFeared View Post
~~~~News Flash~~~~

LinX/IBT stresses the chips FP.

Prime95 stresses a different part.
Good job on the clarity and precision of your response.

OP is right, LINX/IBT are equivalent more or less to Small FFT in Prime. LINX is good for quick OCs though. It always seems to fail faster than Prime's Small FFT on unstable overclocks.
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post #10 of 27
Quote:
Originally Posted by doritos93 View Post
Good job on the clarity and precision of your response.

OP is right, LINX/IBT are equivalent more or less to Small FFT in Prime. LINX is good for quick OCs though. It always seems to fail faster than Prime's Small FFT on unstable overclocks.
My point was more to the fact that someone may be LinX stable for days, but fail prime 95 within minutes, and vise versa.


CPU's do more than one thing and use different parts of the chip to do those things. Using one stress test is like saying your car would win the Grand Prix because you've honed it down to a 6 second quarter mile.
    
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