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08-10-04, 09:00 PM #1
does the the cpu affect the voltage drop from idle to load?
I asked batboy this earlier, but I am just curious to know if anyone has an explanation. Is the motherboard and power supply the only things that maintain cpu voltage and voltage drop (droop) from idle to load? I find my system has a pretty big drop, I was wondering if it may be my chip. Is it possible some chips would have higher voltage drops than others? Thanks for the input.
08-11-04, 12:52 AM #2
- Join Date
- Apr 2004
- Denver, Colorado
Hmmm... I'm a little curious about this as well.Phenom II X6 1100T @ 3.8ghz
8gb Gskill Ripjaw series
2x 120gb OCZ Vertex3 SSD
2x 1TB WD Black HDD
Radeon 6950 @ stock
08-11-04, 06:17 AM #3
I'd give a qualified yes to that. I say qualified because I'm basing this solely on my limited observations. Under full load I was getting .04-.06v droop with my 2.8c, whereas my 3.2E D0 usually droops .06-.08, with a very rare and very brief .1v droop. This is with a PCP&C 510 psu and a fully sinked and wc'd MAX3.
08-11-04, 07:27 AM #4
The power consumtion of the chips will affect the amount of the droop, but only as a % -- if you have no droop, it wont for any chip.
08-11-04, 09:36 PM #5Originally Posted by Styyn
thanks for the input everyone!
08-12-04, 01:40 AM #6
The voltage differential between idle and load is proportional to the current that the CPU draws. The voltage drop on a 2.8C will be less than with a 3.2E because the E chip (a Prescott) draws much more current than a Northwood.
On a side note, the voltage drop is normal; in fact it's part of the operating spec. If a motherboard provides a consistent voltage from idle to load, that's not necessarily a good thing; it can be detrimental to the long-term life of a chip.
08-12-04, 09:23 AM #7
Come to think of it, I have noticed a greater amount of undervolting with a Prescott compared to a Northwood, so I think Nookie is right about some CPUs pull more power. The thing is, his IC7 Max3 is dropping from like 1.55v idle to maybe 1.5v load (this is with a 1.575v BIOS setting). This is with a Northwood CPU. I've never seen an Abit mobo drop that much before.2600K, Asus P8P67 Deluxe, 2X2GB G.Skill Pi PC3-2133, PC & Cooling 750W
watercooled: Eheim 1048 pump, Swiftech Apogee GTX and 2X120mm rad
FS020 case, OCZ SSD, Sapphire HD 6950, Acer X241W 24" widescreen
08-12-04, 10:20 AM #8
yeah i am going to kind of rebuild my computer. Put in the old true 430W and try an IC7-G. I'm really asking this because I wonder if my chip maybe damaged.
08-13-04, 04:41 PM #9
Sorry about the late response. Anyway, as displayed by MBM5, my 12v rail idles at 12.04 and droops to 11.92 under full load. I realize MBM isn't terribly accurate when it comes to voltage readings, so if anyone could tell me the best way and locations for voltimeter readings I can give some more accurate results