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Getting Huge gains by OC'ing HTT vs cpu multiplier

Last response: in Overclocking
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April 6, 2013 4:13:07 AM

Hey guys,

I am using LiNX benchmark to check the performance gains made by OC'ing. The benchmark gives me 19GFlops on stock settings on an AMD FX6100 @ 3.3GHz.

Increasing the multiplier and taking the CPU to 4.2GHz gives me minimal gain in benchmark scores (about 20GFlops).

However, when I overclock the system bus from 200MHz to 230MHz while reducing the multiplier to bring the cpu clock back to stock speeds i.e 3.3GHz. The score jumps to ~23GFlops and I can see the improvement in framerate and gpu usage in some games.

What is the bottleneck? Memory? Because I am using only one stick of GSkill Sniper 4GB memory. Overclocking the NB didn't give me more performance.

TLDR
OC'ing HTT by 30MHz gives me more performance gains than OC'ing CPU by 1GHz.

AMD FX 6100
1XGSkill Sniper memory 4GB
HD Radeon 7850
Gigabyte GA-78LMT-S2PT Motherboard
a b à CPUs
a b K Overclocking
April 6, 2013 6:04:11 AM

which software you are using to check computation ( GFlops ) performance

23gflops is still low
increase memory to maximum supported in your software (which you are using to check performance)

try intel burn test with 2000MB memory setting (for 32bit os)
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April 6, 2013 9:42:36 AM

truegenius said:
which software you are using to check computation ( GFlops ) performance

23gflops is still low
increase memory to maximum supported in your software (which you are using to check performance)

try intel burn test with 2000MB memory setting (for 32bit os)

I was using LinX benchmark, also based on Linpack.

Tried Intel Burn Test. Pretty much the same result.


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a b à CPUs
a b K Overclocking
April 6, 2013 10:39:13 AM

there seems a problem
your abailable ram is 3423MB
I.e, intel burn test is only using few MB ram and this is causing less score
less ram used means less score

you can try cinebench r11.5 to check cpu performance
it is better than intel burn test and produce less heat
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April 6, 2013 10:51:33 AM

truegenius said:
there seems a problem
your abailable ram is 3423MB
I.e, intel burn test is only using few MB ram and this is causing less score
less ram used means less score

you can try cinebench r11.5 to check cpu performance
it is better than intel burn test and produce less heat


I had actually stopped the test after 1 run. That's the reason for the free ram. During testing it had about 200MB free ram.

I have tried running cinebench. But it crashes on me for some reason. And the log it generates is not noob friendly at all :( 



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a b à CPUs
a b K Overclocking
April 6, 2013 11:04:34 AM

if cinebench crashed then it means that your system is unstable

run cinebench at stock settings to check if its due to overclocking

overclocking via multipliyer and/or via baseclock (htt) results in same performance gain provided that it is stable

try this guide to get stable overclock
http://www.tomshardware.com/forum/274820-29-black-editi...
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April 7, 2013 7:27:58 PM

Okay, so the problem was apparently AMD's Application Power Management kicking in and underclocking the CPU at load. Disabled it and now getting normal scores in benchies.

Thanks a lot :) 
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