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confused about happy OC specs like 5.0 Ghz - Page 3

post #21 of 26
Quote:
Originally Posted by smokiez View Post
Basically if this thread helped me out in any way... it's for me to bump my x20 multi back up to 22 instead of trying to go the other way for some notion that BCLK is super important.... unless someone replies otherwise

Thanks
For previous gen i7's and Core 2's, people would find the max capable clock on the CPU, then drop the multiplier and raise the BCLK/FSB to raise the RAM Speeds up.
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post #22 of 26
Thread Starter 
Quote:
Originally Posted by xxbassplayerxx View Post
There are tons of different ways to get a certain clock. Right now I'm running 4.2GHz. Here are two ways to do this:


With the second OC, my memory clock is higher as is my Uncore (IMC) and QPI, even though the BCLK is lower.

Perfect! Now we are getting somewhere (not to be rude to the folks that already replied... but to be fair I think I threw people off by sounding like I'm talking about the SB proc) ... that's what I was looking for... how one actually achieves a high clock and which method is better for performance: high BCLK & lower multie or the other way around?

Or is it really pointless to debate because the performance gained or lost is pretty much insignificant/not worth dealing with? Maybe it's best this this be the case for everyone's sake
    
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post #23 of 26
Thread Starter 
Quote:
Originally Posted by TriBeCa View Post
Well, outside of SB systems it really depends on what you can get. In general, between two OCs that have exactly the same clock speed and RAM multiplier but one has a higher BCLK, the one with the higher BCLK will perform better because the memory is clocked higher. On any given system it may even be the case the an OC with a slightly lower CPU clock speed will perform better if it has a higher BCLK, but its heavily dependent on the system and even what benchmark you're running.

So test with a benchmark that's relevant to what you use the system for, and decide for yourself which is better.
Awesome! That's the explanation I was looking for... or at least a confirmation that I'm not crazy that I see people doing this... dropping the multi & upping the FSB intentionally.

Thanks
    
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post #24 of 26
Quote:
Originally Posted by TriBeCa View Post
with the second OC your Mem Multi is 10, not 8. that's why your memory clock is higher.
Quote:
Originally Posted by smokiez View Post
Perfect! Now we are getting somewhere (not to be rude to the folks that already replied... but to be fair I think I threw people off by sounding like I'm talking about the SB proc) ... that's what I was looking for... how one actually achieves a high clock and which method is better for performance: high BCLK & lower multie or the other way around?

Or is it really pointless to debate because the performance gained or lost is pretty much insignificant/not worth dealing with? Maybe it's best this this be the case for everyone's sake
Thanks for the catch TriBeCa.

Basically, I like the lower BCLK because I can run 1760 6-6-6 18 on my memory whereas with 200 BCLK, I have to do 1600 6-6-6 18 or 2000 7-7-7 21. 2000MHz takes more QPI/VTT voltage than I'd like to run 24/7, so the 176 BCLK is the best combination for my equipment.

Smokiez, sometimes lowering the BCLK but raising multipliers can get you into the sweet spot, as it has with mine.
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post #25 of 26
I used to experiment with this back when I had my P4. I would take a given clock speed, say 4100 MHz, and try various FSB and multi combos. I would then run a complete system benchmark and see which values went up or down. People used to say that a lower multi and higher FSB is best, even close to 500! I believe the multi maxed out at 11.5 if I remember correctly. I got my best CPU, memory, and graphic benchmarks at an FSB of 372 and a multi of 11X. I took the FSB up to about 460 and the multi down to 8.5 or 9X, but all the benchmarks suffered.

The argument was that the FSB clocks everything else, to the higher that number is the better the performance. For whatever reason the efficiency goes down. I'm pretty sure I have these on a back up somewhere. I don't know however if anyone can open them because they are in "Performance Test" format.
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post #26 of 26
5.0ghz: Making overclock easy since Sandybridge
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