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Best method of overclocking (Multiplier, FSB, or both?) - Page 3

post #21 of 28
To OP's original question.

FSB is how fast your computer parts communicate with each other. So instead of just making your CPU communicate faster with the other parts, how bout making your whole PC communicate faster with each other?
    
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post #22 of 28
Thread Starter 
Just woke up with system still stable, sitting at 49c after 8.5 hours if p95 blend!

CPU: 3840mhz, 1.4v
CPU-NBL: 3640mhz, 1.25v
FSB: 240mhz
RAM: 1280mhz, 6-6-6-24
HT Link: 1920mhz



I think any increases from here will require large voltage increases which I do not want without better cooling. I will be posting some of the results from my experiments soon on a new thread. Keep your eyes out for it!
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post #23 of 28
In a word, yes! Increasing (step by step) to 240 on the FSB has enormously helped me to increase both CPU and GPU performance.

...and you are right, it's going to take you a LONG time to get things stablized. Keep your NB and HT voltages on normal or auto. If things get to the point that you run out of the primary adjustments, then raise your HT and NB freq's to as close to, but not below, 2000. I then adjust those vt's to one step above "standard." Having ram that can take the heat also helps. Get as tight as you can with DDR3-1600 with at least PC3-12800. Having an "H" after that number gives you a good shot at 1800 plus with SPD's having an "XMP" (extreme profile) certification. My ST 12800H have SPD cert's for 1800 and 1866. That's as high as I go! Surprisingly, I have never have better bench scores than when my FSB is high, and my CPU is bxn 3.8 and 3.9. Also, I use Intelburn Test on max. Now THAT'S a challenge!

Hope that helps. Have fun, and open your windows. It WILL get hot!
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post #24 of 28
Thread Starter 
lol, thanks for the reply jfcusmc.

Yeah, a FSB overclock seems harder to stablize but yields better benches clock for clock against a simple multiplier overclock.

One thing, I've underclocked my RAM to 1280 and tightened my ram timings to 6-6-6-24. It made no difference in 3dmark score and p95 is still totally stable. I've heard AMD boards prefer lower clocks with tighter timings, any opinions on that? Here are my stable options:

1600mhz cl 7-8-7-24

vs.

1280mhz cl 6-6-6-24
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post #25 of 28
OP, you really need to test the two options on things you routinely use, and determine which nets you the most performance--there won't necessarily be one set of settings that universally works the best.

Maxing the CPU multiplier and upping the FSB is the easiest way to avoid stressing the FSB more than necessary. But if you're shooting for high RAM and FSB speeds, then it's nice to lower the cpu multi to achieve this. But which way to go will depend on your experience with both, so there's no hard-and-fast way to figure it out other than trying it to see how it works.
    
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post #26 of 28
Thread Starter 
Yeah I know, thats why I am testing benchmarks of both options, clock for clock.

I've been using 3dmark06 but want another benchmark to test, any suggestions?
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post #27 of 28
Try the following:

250 x 15.5 = 3.87GHz
6.67x memory multi (puts you at DDR3-1667)
8x HT Link (puts you at 2000)
11x NB (puts you at 2.75GHz)

Don't be afraid of voltage. 1.55v is safe on the CPU, 1.45v is safe on the CPU-NB. Just keep your temperatures below 55*C on the CPU and you're good to go .
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post #28 of 28
Quote:
Originally Posted by stonedzen View Post
Yeah I know, thats why I am testing benchmarks of both options, clock for clock.

I've been using 3dmark06 but want another benchmark to test, any suggestions?
If you want a not-a-real-world test, but something that you can use to gauge relative performance, you could try superpi--just google "superpi mod" (actually I think it's available on our forum, so you could search here to). As I said, it might not reflect real-world performance differences, but it'll help to show relative differences that various settings have.

In my experience, with my sig rig motherboard, I was getting some interesting results with a high overclock FSB, but the CPU at the same, stock speed--noticed empirically that all of my programs would open up noticeably faster--for example, Photoshop would open up in something like 8 seconds rather than 20 seconds--checked systematically multiple times. I made sure that each time I opened it was after a reboot, to ensure that the program wasn't being cached to the RAM (this was on XP, so no prefetch or superfetch was being used). No idea why the FSB had THAT much of an effect on disk access and application load time.
    
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