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vcore drops under load???

post #1 of 6
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I have a p4 531 socket 775 HT 3.0ghz:


When I put it under load the vcore drops almost .1 v.

Is that a sign that my psu is underpowered?




My psu is a 250w ASUS by the way.

Powered my sempron and pci-e card fine. I'm an AMD guy and I know the p4's are very power hungry.
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post #2 of 6
no that is a normal thing with the voltage.. its called a vdroop ... altho a 250w psu is rather weak for overclocking depending on the motherboard you can actually do a vmod for the drop to make it more stable.. you will find that at higher overclocks the dropping of the vcore can cause you to go unstable... also things like thermal thorttling eist and stuff like that will also cause the voltage to pop up and down as well..
    
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post #3 of 6
Yes get a new PSU a .1 vdroop is too much thats ALOT. My 630 @ 3.6Ghz vdroop is only .01-.02 on a 650W w/dual +12v rails 20A each.
     
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post #4 of 6
The droop is usually the board, not the PSU....although, as has been said, a 250w PSU is not going to let you OC much.

Also, there is no reason to mod your board to eliminate the droop unless you want to set the highest voltage in BIOS. If you need 1.3v for your overclock, and you have a .1v droop, just set your BIOS for 1.4v. Unless you need 1.3v and the board only goes to 1.35 (then under droop it drops to 1.2v, and therefore not stable), there is no reason to void your warranty soldering wires and stuff onto your board.

Although .1v is a big droop, it's not a real concern until you have a PSU that can deliver more power to the system. The PSU is the weak-link, not because it is dying, but because it is such low powered.

That board you're using is an odd one too, not sure what it is or where it came from, is it out of a pre-built system?
post #5 of 6
vdroop sucks........the life out of ya oc, so does that 250w psu please get a 350w+single rail with 20 amps+
    
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post #6 of 6
Hi you might find this explanation from Asus interesting.

http://support.asus.com/faq/faq.aspx...B-E%20Plus

"As Intel specification clearly states Vcc (CPU Vcore) should drop in propotonal to the increase of Icc (CPU current consumption), in order to prevent causing permanent damage to your CPU. When CPU is under stress (in other words, under higher load), the current consumption of the CPU will go up, and the CPU Vcore will then drop to conpensate this change. This is a perfectly normal behaviour, and will not effect the overall stability of your system."
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