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250 Bus speed, NB Frequency speed?

post #1 of 12
Thread Starter 
So I bumped my Bus Speed from 200MHz to 250. My settings are 250x14=3.5GHz for cpu. My ram is running at 500MHz *2 for 1000MHz @ 6-6-6-17. tRC is 20. CR 1T.

The first time I turned it on it was extremely sluggish. I thought, that it might because I didn't give my system enough CPU-NB speed (I had it at 2200MHz). Is 2750.1MHz to high for a 250MHz bus speed? Also I have DDR3 ram, I want to get the lowest possible timings for 250 bus range, what timings would the lowest I could try?

Edited by hal515 - 3/22/11 at 6:27pm
    
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post #2 of 12
Those timings are as low as you will likely get. Cas 5 is fairly unlikely, but you can try it. Won't really make a difference though. As for nb, no speed is too high, as long as its stable.
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post #3 of 12
Thread Starter 
Quote:
Originally Posted by cky2k6 View Post
Those timings are as low as you will likely get. Cas 5 is fairly unlikely, but you can try it. Won't really make a difference though. As for nb, no speed is too high, as long as its stable.
Do you think if I bumped up the NB speed will it speed up. I want to make everything smooth, I don't want to make the ram overly fast, but I want my CPU fast.
    
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post #4 of 12
I don't really know how amd's imc works, but if its unlinked from bus/ram, then you should raise it as high as you can, but test that its actually stable.
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post #5 of 12
What is your HT Link Speed running at when Ref Clock is at 250?

Maintain the HT Link Speed to 2000MHz +/- 100MHz for best results and raise the NB Freq as high as possible.

Example, on my CHIV the HT = 2047MHz, The CPU/NB Freq = 3070MHz while the Ref Clock is at 255.

Just noticed yours is running 2500MHz? Drop it back to 2000MHz and try that? Any higher will actually decrease performance.
Edited by The Sandman - 3/22/11 at 6:52pm
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post #6 of 12
Yes having the NB speed higher will increase performance all around. In my personal testing, the difference is quite noticeable. 2750 is pretty decent imo. And yes, put your HT link speed back to the stock 2000 or it decreases performance.
Edited by The_Punisher - 3/22/11 at 6:54pm
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post #7 of 12
Thread Starter 
Ok thanks guys, I will try that.

Question though because I am human and I am curious, how come lowering HT increases performance?
    
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post #8 of 12
Quote:
Originally Posted by hal515 View Post
Ok thanks guys, I will try that.

Question though because I am human and I am curious, how come lowering HT increases performance?
I just tried to find the actual link for the real explanation but couldn't locate it for you sorry.

It's not that lowering the HT increases the OC, but rather when it's raised it decreases it. Always works best when at 2000MHz +/- 100MHz is what I know, and rather than giving you a half a$$ed answer I'll let someone who remembers the actual reason explain it better lol. I've read it in several other threads but must not have bookmarked it for times like this lol. Wish I had.
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post #9 of 12
Thread Starter 
Thanks anyways, Prime95 has been running for about 20min now. Gonna let it run while I do homework.
    
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post #10 of 12
Thread Starter 
Is there a temperature monitoring software for MCH? I want to make sure my CPU-NB can handle the speed and heat.
    
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