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CPU-NB Frequency, HT Frequency

post #1 of 11
Thread Starter 
For AMD Phenom II, it seems to me that these 2 frequencies have absolutely no influence on performance. I don't see any difference between
CPU-NB 2600Mhz, HT 2400Mhz
and
CPU-NB 1800Mhz, HT 1600Mhz

I used to get 3550Mhz from 16.5*210, now 18.5*200 =3700Mhz, which one has better performance? In the past I heard somewhere for the same cpu frequency, higher ref clock performs better(aka 220*15 is better than 200*16.5 tho they are both 3300Mhz), is this theory still true for Phenom II?
I was able to let the ref clock go up to 215Mhz but with 18.5 cpu multiplier it is not stable even with ref at 205Mhz, isn't ref and multiplier relatively independent? Or some other factor is affecting my overclocking.
    
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post #2 of 11
I have never heard that rumor for Phenom IIs. The two numbers that matter most for performance are your core clock frequency and your NB frequency. Try to get as good of a balance as you can on those two (while balancing voltages and temperatures, of course). As far as HT (HyperTransport), it should be kept AT or AS NEAR AS POSSIBLE TO 2000 MHz.
 
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post #3 of 11
The fact that you didnt notice any difference with 2600 NB, was because you had your HT-link at 2400, which made it perform much worse. 2600 NB versus stock 2000 should be much faster.
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post #4 of 11
Thread Starter 
200*18.5
NB at 2600
HT at 2000
still no difference at all from all aida64(everest) benchmark tests
    
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post #5 of 11
Maybe the NB is unstable, not getting enough voltage. Try bumping it by a little bit.

Mine goes from around 11.500 or so Memory copy to 14.500 with 2750Mhz NB.
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post #6 of 11
Thread Starter 
Yeah it crashes about 20mins stress test. I don't know what I can do. CPU, CPU-NB 1.485v, not sure what's causing it to crash

I ran the test again and found NB 2600 does help with memory benchmark, but does little on cpu/fpu. Is this right?
    
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post #7 of 11
cpuNB will only affect memory speeds/bandwidth, nothing else directly (indirectly it improved how fast information can be moved from ram to cpu which will benefit applications that can benefit from the increase speeds).

The best way to test it imo is to use Maxxmem: http://www.maxxpi.net/modules/download_gallery/dlc.php?file=15


1.485v is quite a bit, try bringing that down a bit.

Also that is correct the fp and cpu (integer) parts won't be affected, however they will benefit from the increased memory speeds and bandwidth in real applications.
Edited by BallaTheFeared - 5/15/11 at 3:21am
    
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post #8 of 11
Quote:
Originally Posted by BallaTheFeared;13510832 
cpuNB will only affect memory speeds/bandwidth, nothing else directly (indirectly it improved how fast information can be moved from ram to cpu which will benefit applications that can benefit from the increase speeds).

The best way to test it imo is to use Maxxmem: http://www.maxxpi.net/modules/download_gallery/dlc.php?file=15


1.485v is quite a bit, try bringing that down a bit.

Also that is correct the fp and cpu (integer) parts won't be affected, however they will benefit from the increased memory speeds and bandwidth in real applications.

Well said,but remember OP your RAM speed and timings also effect your memory performance,so if your RAM is slow with loose timings the NB increase isn't going to help much.
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post #9 of 11
HT frequency should not have much of an impact at all on performance. It's simply how the chip communicates with with the chipset, at least on single socket/die platforms. I run my 555BE at 1GHz HT with zero loss in performance from 2GHz.

NB frequency can be a big deal, as it directly affects memory performance and inter-core communication.

Most of AIDA's CPU tests aren't ones that will stress the NB, so I'm not surprised you aren't seeing a difference.

I'd try some real world tests.
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post #10 of 11
Thread Starter 
I think I find the cause of the problem. If I set 3rd core off in BIOS, the system is very stable.
In the bios if I set ACC to per core, i see 2nd core to 6th core(on/off), and core 0 to core 3(value -12 to +12). How can I tell 3rd core's core number? My guess is it cannot be core 0 or core 1(defective), so I set core 2 and core 3 to +12, no crash yet
Are core 0 and core 1 must be flawless? I am not sure if the core numbering is physical(first two cores on die) or just logical(2 tested cores). I assume the core number is static(not assigned every time it powers on, but something set in the factory).

Some people say I shouldn't manually set a value for each core for Phenom II cpus, I don't get it....
    
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