Time for a new PSU?

[996GT2]

After I got my X2 installed a few days ago, I set out to OC it and eventually got 2.6 GHz stable at 1.424VCore (as reported by CPU-Z). However, the voltage is actually set to 1.475V in BIOS, so .05V of VDroop is quite a bit IMO. With my former chip, a 3500+ at 2.8GHz, the VDroop was more like .2V. Is this excessive VDroop cause for concern with regards to the PSU?

BTW I'm running all of the components in my sig on a 400W Fortron AX-400PN with 16/18A on the two +12V rails.

EDIT: Just did a bit of PSU research and found that my SAGA 400W unit only has a +12V draw of 25A max on both rails. Is this enough to support the components I have?

Oh and I have 1 7200RPM Seagate HDD and a NEC DVD+/-RW, along with 3 92mm, 1 80mm, 1 50mm, and 1 120mm fans in the system in addition to what is in the sig.

 

[BlueWeasel]

Maybe it's a MB issue?

 

[VinDSL]

Originally posted by: BlueWeasel
Maybe it's a MB issue?

That's what I'm *thinking* too...

I'm running a OCed P4 EE on a LanParty Pro875 mobo, and I Vdroop pretty bad @ 1.70v and above!

Thought it was the PSU, so I bought an Antec EarthWatts PSU... same problem!

Sold it and bought a Ultra VXS... same thing!

The weird thing is, voltages are exactly the same, as well as Vdroop, soooo....

Three PSUs, same problem! Gotta be the mobo... 😉

 

[VinDSL]

Originally posted by: 996GT2
After I got my X2 installed a few days ago, I set out to OC it and eventually got 2.6 GHz stable at 1.424VCore (as reported by CPU-Z)...

BTW, I read that CPU-Z is buggy, so I confirmed Vdroop by plugging my trusty Fluke 77 DMM into an unused HD connector, and it was spot on... 😀

 

[mechBgon]

Many P4s are designed to dynamically lower their core voltage as load goes up. If that sounds odd, well, it is 😀 But it comes from Intel's own tech documents.

 

[BlueWeasel]

I missed the CPU-z part in the OP, but I agree with VinDSL.

On my Ultra-D CPU-z reads consistently 0.05v lower than what is set in the BIOS. After doing some research, I found some info from those who tested the voltages on their Ultra-Ds with a digital multimeter. They discovered that the BIOS setting was spot on accurate, regardless of what CPU-z or any other software was reporting.

 

[njdevilsfan87]

Lucky you - when I set 1.475V in the bios, I go down to 1.392V under load on my DS3 Rev3.3 - good enough to run my e6600 at 3.4Ghz, but still, come on!