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black edition CPUs - should I only use the multiplier?

post #1 of 13
Thread Starter 
I was under the impression that the CPU multiplier, since it only changes the core speed, was the best way to overclock a CPU if you aren't overclocking anything else. But just a while ago I saw a thread saying to raise both the FSB and the multiplier even if you have a black edition, for 'more stability', along with adding voltage to the NB, etc to support the raised FSB.

http://www.overclock.net/13075423-post3.html

While I don't doubt this guys credibility I would really like to know if I (who OCs strictly with the CPU multi) should incorporate some FSB tweaking for a better overclock.

Maybe that's why I seem to be having trouble hitting a good speed on my processor....I'm just missing something?
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post #2 of 13
I've usually achieved my best overclocks by tweaking both. In some cases lowering the FSB and increasing the multi resulted in a better OC for me, and in other cases the reverse was true. You just have to tweak until you're happy with the result. The unlocked multi just gives you an additional item to tweak, which can result in a better OC in many cases.
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post #3 of 13
I would try it at least. Isn't your HT Link/CPU-NB speed stuck at 2Ghz if you don't use the FSB?
post #4 of 13
Quote:
Originally Posted by t-ramp View Post
I would try it at least. Isn't your HT Link/CPU-NB speed stuck at 2Ghz if you don't use the FSB?
Nope, those are unlocked and you can raise them by 200mhz increments.
post #5 of 13
Thread Starter 
Quote:
Originally Posted by t-ramp View Post
I would try it at least. Isn't your HT Link/CPU-NB speed stuck at 2Ghz if you don't use the FSB?
Yes, but (excuse my ignorance), does it matter? I don't care about overclocking the RAM or anything.

I know the HT link and NB could improve performance when overclocked but I didn't think it would make the CPU more stable as the post I linked to said. Also my NB runs at 81c (which is normal for my board) which doesn't give me much headroom at all.
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post #6 of 13
You may be having problems due to cpu being unlocked. From what I've read unlocked cpu's usually don't OC as high. Another point is some cpu's do better with a lower multiplier and higher ref clock to achieve the same OC. As you said raising the NB Freq will show you even bigger performance gains which is something you could also consider doing. You might want to add an internal fan just for the NB HS.
 
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post #7 of 13
As stated, using both the bus and the CPU multi increases your overall performance in most cases and typically is used to round a stable OC, system-wide. Simply OC'ing the CPU could allow for bottlenecks from other components on your rig. You will notice some performance increases though just using the CPU multi. It really just depends on what you are wanting to do with your OC, there are more than a few different methodologies to reach the end goal, that's whey there isn't an all inclusive manual for OC'ing and why most experienced OC'rs will give you the "bump and test" recommendation when asked for advice.

As far as your NB is concerned, that is a pretty high temp, is that at load, idle or just everyday usage temps? Have you tried removing the HS and replacing the TIM and checking for good contact, etc? I had to do that on my CIVF and I now do this on all of my mobo's before I install them in the case for use.
   
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post #8 of 13
Quote:
Originally Posted by railfan844 View Post

Maybe that's why I seem to be having trouble hitting a good speed on my processor....I'm just missing something?
Did not see any improvement when i clocked my phenom with fsb isntead of multi. Tho my ram was OCZ and as total crap, so maybe it was the case
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post #9 of 13
Increasing FSB will (to a certain extent) improve performance more than just using the multiplier, but in my experience it may be less stable.
I would suggest you start by lowering all your multipliers and first see how high you can take FSB before it becomes unstable, then dial it back a bit and use your multipliers to bring it up to where you want it in a systematic way.

I benchmark a bit higher with a 250 Mhx FSB and x16 than I do with 200 Mhz and x20, but I needed slightly more voltage to be stable with the 250 Mhx FSB.
No, I cannot explain why. Just my experience with my recent setup.

In the past I had always done just FSB OC'ing due to few unlocked CPUs, so I dont have anything to compare to back then.
post #10 of 13
i use a combo of both.
since FSB OCs RAM too, i bump it up too.
    
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