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Voltage not helping overclock

post #1 of 11
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Well my friends mobo is toasted so we figured we would put his cpu in my rig and see how high it can OC so he knows if he should get a nice overclocking board. Well around 266 FSB (X9 = 2.4Ghz) it will boot and load windows fine but prime 95 fails instantly or after like 5 seconds. So we tried raising the cpu voltage to like 1.525, 1.55, and 1.6 but it makes no difference from stock voltage. I thought maybe it was my mobo or ram so I just dropped the cpu multi to 8 and then it works so that must mean cpu right? How come the voltage isn't helping at all then? Also we tried 275 X 9 and that does the same thing... it boots and loads windows but prime 95 fails instantly and voltage doesn't affect anything. Temps never went over 34C. Any ideas?
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post #2 of 11
Are you setting a divider so the RAM isn't being the problem in the equasion!
    
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post #3 of 11
Quote:
Originally Posted by Fishie36
Well my friends mobo is toasted so we figured we would put his cpu in my rig and see how high it can OC so he knows if he should get a nice overclocking board. Well around 266 FSB (X9 = 2.4Ghz) it will boot and load windows fine but prime 95 fails instantly or after like 5 seconds. So we tried raising the cpu voltage to like 1.525, 1.55, and 1.6 but it makes no difference from stock voltage. I thought maybe it was my mobo or ram so I just dropped the cpu multi to 8 and then it works so that must mean cpu right? How come the voltage isn't helping at all then? Also we tried 275 X 9 and that does the same thing... it boots and loads windows but prime 95 fails instantly and voltage doesn't affect anything. Temps never went over 34C. Any ideas?
They dont like anything over 250MHz HTT. At least in my experience. 250 = fine, 251 = prime error, 260= prime error 261=wont boot. I have heard this elsewhere also.

Do what Duke said also, to make sure it isnt RAM. Only good ram can handle 275. or even 266.
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post #4 of 11
Lower the HTT Multi?
post #5 of 11
Thread Starter 
I think everyone missed a key fact in the first post. I said that it runs fine until I turn down the CPU multi one notch. So that instantly means it's not the ram, not the hyper transport, not anything but the cpu right? So all I'm wondering is why the voltage isn't helping and why the overclock is so lame...
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post #6 of 11
The CPU's multiplyer is irrelevant, the HTT is!
Anyway, check with the clawhammer users... I believe thay need more vcore and some are less OC friendly!
    
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by The Duke
The CPU's multiplyer is irrelevant, the HTT is!
Anyway, check with the clawhammer users... I believe thay need more vcore and some are less OC friendly!
So you think I should lower the HTT? What would cause that? I tried .1 extra volts on the chipset and it helped but didn't fix it. Think maybe I should go for more chipset voltage? Or something else? I know it's not my ram for sure because it was only at 203mhz when I usually run it at 220mhz. Also I tried following the FAQ for finding max HTT but my board doesn't seem to like low ram dividers and cpu multypliers...

Also one final note: It's a newcastle not a clawhammer.
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post #8 of 11
Same thing happened to me. I maxed out at about 237x9. Then I put a divider (200/166), and was able to take it to 247x9, any more and I would start getting errors on memtest and prime. What I didnt notice was that my HTT was at 1040! which made it really unstable, and was holding me back from further overclocking. (I found this through nTune from nVida.com for nvidia chipsets) So I lowered the HTT multi from 4 to 3, which set the HTT to about 768, thats under stock 800. So i then cranked up the cpu to 267x9 for a stable OC all the way to 2400Mhz. And my voltage is currently @ 1.6 for CPU and 2.7 for memory. Note that im using a Athlon 64 2800, so if you have a 3200, you can probably go higher. I hope I have helped you in any way and good luck!
    
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by PeDrO305
Same thing happened to me. I maxed out at about 237x9. Then I put a divider (200/166), and was able to take it to 247x9, any more and I would start getting errors on memtest and prime. What I didnt notice was that my HTT was at 1040! which made it really unstable, and was holding me back from further overclocking. (I found this through nTune from nVida.com for nvidia chipsets) So I lowered the HTT multi from 4 to 3, which set the HTT to about 768, thats under stock 800. So i then cranked up the cpu to 267x9 for a stable OC all the way to 2400Mhz. And my voltage is currently @ 1.6 for CPU and 2.7 for memory. Note that im using a Athlon 64 2800, so if you have a 3200, you can probably go higher. I hope I have helped you in any way and good luck!
No I've already tried that stuff, like I said in the first post. Also it is a 2800, like I said in the first post.
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post #10 of 11
Hmm... ive never tried raising chipset voltage. What about memory timings ? Is ia at 1T or 2T ? I think the 2gb of memory is holding you back somehow. I think 1 gig is the best for OC'ing. like 2x512. I only have 512 value ram on my K8NS Pro. Try this article

http://www.auphanonline.com/articles...id=1518&page=1

Since we both have the same mobo, try removing some sticks, to like 1 gig or 512, and then try it. In most cases, 1GB outperforms 2GB, since you have a bigger delay. Once you remove some sticks, go into the bios and press CTRL + F1 , and a new menu will come up. I think ittle be advenced chipset features (just try all untill you find one that says "1T or 2T" and change it to 1T. Anyway, try that article, it really helps.
    
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