Re: Check these Power Supply Voltages
- From: John <John@xxxxxxxxxxxxxxxxx>
- Date: Tue, 12 Jun 2007 09:25:13 -0500
Barry Watzman wrote:
Re: "The PSU is 1000 watt, and since I'm not yet running my new Vista-level components, the PSU is overkill"I do notice that you are not running even one 8800 video cards, let alone two of them. Your PSU ought to be just fine then.
A 1KW power supply is overkill almost no matter what you are running.
My Core 2 Duo system with two hard drives, two optical drives, a floppy drive, a Creative "Live Drive" and a built-in card reader has been running just fine for a year on a 360 watt power supply.
John wrote:Paul wrote:John wrote:See what you think.
My BIOS showed some pretty close voltages on a couple of previous power supplies, so it appears to be accurate. The size of this new PSU is enough to power two high end video cards and I'm only running one.
Here are the voltages:
VCore 1.79
3.3v 3.25
5v 4.78
12v 12.48
What do you think?
http://www.formfactors.org/developer%5Cspecs%5CATX12V_PSDG_2_2_public_br2.pdf
Table 2. DC Output Voltage Regulation
Output Range Min. Nom. Max. Unit
+12V1DC (1) ±5% +11.40 +12.00 +12.60 Volts
+12V2DC (3) ±5% +11.40 +12.00 +12.60 Volts
+5VDC ±5% +4.75 +5.00 +5.25 Volts
+3.3VDC (2) ±5% +3.14 +3.30 +3.47 Volts
-12VDC ±10% -10.80 -12.00 -13.20 Volts
+5VSB ±5% +4.75 +5.00 +5.25 Volts
(1) At +12 VDC peak loading, regulation at the +12 VDC output can go to ± 10%.
(2) Voltage tolerance is required at main connector and S-ATA connector (if used).
(3) Minimum voltage during peak is greater than 11.0 VDC
The motherboard measurements are not necessarily that accurate. A multimeter
can do a better job. But I paid a little over $100 for my multimeter, and I think
it is somewhere in the 1.5% to 2% range for accuracy (not really that good). The
power supplies I've checked, generally look better (closer to nominal) when I use
the multimeter.
PCI Express video cards, have 3.3V and 12V pins in the slot, and a 12V
connector on the end of the card. If you plug in a second video card
with PCI Express, then there should be no additional load on your +5V.
You wouldn't be plugging a second AGP video card, as an AGP motherboard
would only have one.
PCI slots have power pins for a number of different voltages.
Measure it again, when you install the second video card.
Would this supply be from Seasonic, or built by Seasonic for
someone else ?
Paul
Thank you for your fine work on this.
First, the measurement is about the same using the readings from the BIOS and my multimeter. The PSU is 1000 watt, and since I'm not yet running my new Vista-level components, the PSU is overkill. I agree that other PSUs do better.
From what you and others tell me, the 5% range is SOP with today's PSUs. And I'm probably stuck with it. In my computer work 25 years ago, those devices had to be no more than +/-.5% or they just plain wouldn't work. Apparently devices these day are capable of compensating or just plain able to handle power better. I know the danger of voltages too low is that the resistance goes up and the devices get hot.
John
John
.
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