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E6600 voltage decreases during load?

J

Jimmy the Greek

Gawd
Joined
Aug 20, 2002
Messages
657
I'm running my E6600 at 3.2GHz and 1.325v (set in BIOS). At idle, CPU-Z and Speedfan both report 1.280v. After several hours of small FFTs in Orthos, it drops to 1.256v.

Is this even possible, or does it sound like a sensor is awry? If these numbers are inaccurate, is there any chance that the chip could actually be running above the 1.325v limit set in the BIOS?
 
Some motherboards use 8 phase VRMs to help reduce vdroop - but component quality seems to matter more than the number of phases.

I guess the optimal solution (as of today) would involve the highest quality components, optimally tuned PWM algorithms and 8 phase VRMs.
 
8 Phase VRM doesn't do a damn thing for vdroop. The Asus p5B series are the worst drooping boards, yet the p5b-deluxe, which I own, has 8 phase power and droops like a mofo. On the plus you can do a pencil vdroop mod to correct this. Just don't believe that 8 phase power is going to reduce droop, cause that ain't true!
 
Why is it that Core2 Vdroops and X2's add extra voltage when under load?
 
Part of the Inte Spec unfortunately

Search on Xtremesystems.org/forums for vdroop mods for that board. Using a pencil I shorted a resistor on my P5B Deluxe and now I get more voltage on load like an X2. ;) No more droop at all.
 
dnottis said:
8 Phase VRM doesn't do a damn thing for vdroop. The Asus p5B series are the worst drooping boards, yet the p5b-deluxe, which I own, has 8 phase power and droops like a mofo. On the plus you can do a pencil vdroop mod to correct this. Just don't believe that 8 phase power is going to reduce droop, cause that ain't true!
Click to expand...

Of course it can help :p

That's why we have 2 phase power for Dryers and 3 phase for welders...

Some newer motherboards even use 12 phase VRMs / 30 degrees out of phase with each other.

However, poor implementation, poor VRM algorithms, poor quality components can more than make up for any advantage gained from extra phases.

If there was no advantage to adding additional phases, we would have 1 phase VRMs instead of the 'standard' which is 5.

Incidentally, my P5K (w/ 6320 @ 426MHz FSB) has no vdroop at all... it has a voltage stabilization feature in the bios - when you enable it, it greatly reduces vdroop. In my case, I'm steady at 1.375v, even during an hour of orthos.

But I'm not attributing it solely to 8-phase power - it's a combination of everything I mentioned.
 
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