IBT Result

[Amraam]

Ran IBT for 10 runs and got these results:

It's an i5 2500k at 4.2Ghz, 8GB DDR3. Does that not seem a bit low? I thought the rule of thumb was 4.2*32?

 

[j.col]

have you service pack 1 for windows 7 installed?
have you the avx update for IBT?

also you need to run IBT properly.
Wingzero30 will be along shortly, and he can explain the specifics

basically have a look in task manager and notice how much free ram is listed under the performance tab.
shut down all running programs like anti virus, IE, etc.... try to have nothing running while test is running.

in IBT set threads to how many cores your cpu has (not that familiar with SB) and then click on custom ram and enter an amount just below the free amount.
eg. i have 2520mb free ram. so i enter 2500 into the custom ram.
run the test.

this way you are using just free ram, and not also cached ram, so you should get higher gflops.

also the score looks ok, maybe a bit on the low side, but not too much.
and then the score is good if its over 75% of the theoretical maximum amount

 

[WingZero30]

It's an i5 2500k at 4.2Ghz, 8GB DDR3. Does that not seem a bit low? I thought the rule of thumb was 4.2*32?

Indeed you are right.

As you are making use of AVX instructions set, SB Flops performance will double theoretically, going from 4 multi-add instructions per cycle to 8 per cycle.

4.2GHz x 8 instructions/cycle x 4 cores = 134.4 GFlops (theoretical peak flop value)

However you are getting around 94-95 GFlops which I believe is around 70% of the theoretical peak value. It is still very good. Remember you can't get peak value in actual running of the test due to ram latencies, operating system overhead, background processes etc.

So your actual will always be lower than theoretical peak.

Wingzero30 will be along shortly, and he can explain the specifics

Thanks j.col

You have already explained it well enough.

As j.col has stated, set the threads to 4 manually, as your cpu has 4 physical cores.

Use different amount of ram values to see/optimize your IBT performance.

Remember maximum stress level just means you are making use of all the 'available memory'. This value itself will fluctuate and doesn't mean you will be getting very high GFlops results.

 

[OLDPHART]

Run IBT with the No of threads your CPU has, not auto, i7920 has 8, go to Device Manager > Click on Processors and count your threads.

I read his thread about IBT, easy way reboot PC let it idle for about 10 to 15 minute's then run IBT with the correct No of threads your CPU has. All readings should have e-002 at the end if you have any with e-003 it will still say you have passed, but you are not 100% stable, all must read e-002 at the end, just up your core voltage till alll reading's show e-002, then your CPU is stable.

 

[logi-cat]

I think you need to run ITB for a longer period of time. I ran 10 once and thought it was stable but once i ran 50, i found instability without a few minutes.

 

[WingZero30]

I think you need to run ITB for a longer period of time. I ran 10 once and thought it was stable but once i ran 50, i found instability without a few minutes.

Yeah, the consensus on this forum is to run IBT for 20-50 passes, preferably 50 passes for rock stable rig