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Lower Multiplier, Higher FSB, Greater CPU Stability...?

post #1 of 9
Thread Starter 
I recently found my CPU overclock (of 3.2) wasn't as stable as I thought and I found that I needed to down-clock (to 3.0) to make everything work.

After BIOS 1101 I was able to change my CPU's Multi downwards, so I thought I would see just how far I could push my DDR2-667 RAM towards DDR2-400. In the process, I discovered the following...

333 x 9 requires 1.440v post v-droop v-core to be stable & loads @ 54°C.

375 x 8 requires 1.344v post v-droop v-core to be stable & loads @ 47°C.

Does this mean that lowering the CPU multi while raising the FSB produces increased CPU stability requiring less voltage, or am I missing something? It's a bit odd, but I couldn't get my CPU stable with less that 1.440v using a 9x multi, but now with an 8x it's stable using 1.344v... How can this be?

I'd appreciate it if somebody knows why this might occur and could explain it, as it doesn't seem to make much sense to me .

Thanks.

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post #2 of 9
I don't know why it occurs, but I have experienced the same thing. On my A64 3000+ rig I could only reach 2.35GHz stable at 10x. With 9x I could reach 2.43 stable. Both stock voltage.
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post #3 of 9
I have no idea how or why that occurs, but I noticed something very similar with my E6600. 400x8 was a lot cooler and more easily attainable than 356x9.
It makes no sense to me, but I'm going to try that to overclock my quad when I get home because I was having stability issues overclocking it at all with 9 multi. Last night I dropped it down to 8 multi and raised the FSB and even though it still isn't at stock speeds, was running perfectly AND pretty cool.
Talkin' 50C at load (with the help of air conditioning but whatever).
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post #4 of 9
whats your watercooler? i watercool and my load temp never raises higher than 42c on my e6600 with a multi of 9 and 4:5 ratio my cpu is at 3.4ghz and my ram is at 940mhz, they seem high temps for a watercooler
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post #5 of 9
Thread Starter 
Thanks for your input guys . It's nice to know I'm not the only one who has experienced this seemingly odd phenomenon.

I now have it @ 400 x 8 with 1.400V (post full load v-droop v-core) and so far it's ORTHOS stable... I needed 3% more voltage to get the CPU stable @ 3GHz than I am able to use now @ 3.2GHz AND my load temps are lower now.

Hopefully I can get my RAM stable @ DDR2-800 4-4-4-14 (stock DDR2-667 3-3-3-12) and I'll be able to run this set-up all the time. A high FSB will help overall system performance after all.

If anybody else has experienced this, please feel free to post here with details. Also, if anybody does know why this phenomenon happens, I'd be really interested to know, thanks!

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post #6 of 9
i posted something abit earliar along those same lines,i could jump right to 3.2with x8 instead of 9 400x8=3.2 v-core 1.35 ram 800 4-4-4-12 2.0 volts,my gremin11 is still breaking in just installed yesterday,ill wait see if temp drop more before i push
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post #7 of 9
Thread Starter 
OK, managed to get the CPU stable at both 3.2 and 3.3... I bought some more RAM (it was time for an upgrade to 2GB) and I did some testing with two different bus speeds and I have to say that I see virtually no difference (in performance terms) between the faster and slower speeds...

See below:



You'll have to ignore the low scores as I think there may be a driver problem on my system currently (Nvidia) which I may have to resolve by going back to a pre-9X.XX version...

... However, as you can see, I kept the CPU speed the same, and just changed the multi down and the bus speed up. The bus speed increased by 12.5% (not a huge jump to be sure) but the scores don't really improve all that much, if at all... I would have expected to see a couple of percent improvement at least, but oddly (at least to me) the only change (score wise) appears to be downward in most cases and even then, the change is so small as to be within a fair margin or error for these tests....

I have to conclude that there is no real change in performance (according to these tests) between the slower and faster bus speeds...

Can anybody explain this for me please, as I don't really understand the outcome here .

Thanks .

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post #8 of 9
Thread Starter 
Somebody willing to help me out here and take a stab at explaining my results? Don't be afraid!

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post #9 of 9
oc-ing at higher multi stresses cpu. by lowering multi, less stress on cpu. by raising fsb, more stress on NB. just get a good cooler for your NB.
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