Curious OC results on 4800x2

[iceman_84]

Hi,

I'm rather new at overclocking and am on my first attempt.

I'm trying to overclock my 4800 x2 to 2.750 GHz with a bus speed of 220 and Multi set at 12.5. This is being done on a Nvidia Nforce 4 chipset.

I've had great stability at 3.75 vcore (I can only increase by .25) when the computer boots. I've never had an error on prime 95 with 10 hour testings, however sometimes when the computer is completely cold (I.E. not been turned on in a few hours) I won't POST. But if i restart the computer I can boot just fine. The computer just hangs with a black screen with all of the fans maxed.

I am running cool and quiet, perhaps I should disable this? I haven't seen anything like this before in my research before attempting an OC, so I'm rather confused at how I'm getting these results.

 

[spuddyt]

use CPU-Z, then check if the multiplier is what you set it to, WHEN UNDER LOAD - i've heard of issues with OC'ing and cool and quiet

 

[iceman_84]

Done that, the multiplier fixes itself fine. Although the voltage registeres differently then waht I have it set in the BIOS. Could that be why I'm sometimes not able to boot?

 

[coa]

I have an overclocked CPU 3500+ on 2.86GHz and when i try to turn on Cool 'n Quiet it can't boot up.I don't care

 

[jeanpieterse]

Processor : AMD 64 X2 4800+ Brisbane @ 3.125 Ghz (250*12.5) 1.41V
Motherboard : ASUS M3A32-MVP Deluxe
Memory : DDR2 800Mhz = 2 X 1Gb Transcend @780 Mhz
Graphics : XFX GeForce 8800GS 384MB @ 725/950/1700
Sound : Soundblaster Audigy 5.1