Rory said:
I was wondering what the power usage would be for a system with:
GPU: EVGA GeForce 8800 GTS KO ACS
CPU: E6750
RAM: 2GB Corsair 8500
Mobo: Asus P5K3 Deluxe
Is there any way to figure this out?
588/1840MHz (500/1600 standard?)
http://www.evga.com/products/moreinfo.asp?pn=320-P2-N817-AR&family=23
Out of stock $324
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130040
Video card power - 114W on 12V rail, 4W on 3.3V rail ( 114W/12V = 9.5A )
http://www.xbitlabs.com/images/video/gf8800gts320MB-roundup/evga_power_full.gif
(
http://www.xbitlabs.com/articles/video/display/gf8800gts320MB-roundup_8.html )
E6750 - 65W/12V * 1/0.90 = 6 amps (assumes 90% efficient Vcore converter)
http://processorfinder.intel.com/details.aspx?sSpec=SLA9V
Hard drive - 12V @ 0.6A, 5V @ 1A
CDROM - 12V @ 1.5A, 5V @ 1.5A (12V draw when media present)
Fans - 12V @ 0.5A allocated
Motherboard power - 50W allocated, includes chipset and RAM. P5K3 chipset
is P35 (16W) and ICH9 (5W). RAM sticks are pretty easy
on power these days.
P5K3 uses DDR3 RAM. Corsair 8500 sounds like DDR2.
DDR3 runs at 1.5V. DDR2 runs at 1.8V.
P5K3 diagram showing DDR3 slots.
http://images10.newegg.com/NeweggImage/productimage/13-131-181-04.jpg
This is Corsair's list for a P5K3. Probably expensive.
http://www.corsairmicro.com/configurator/product_results.aspx?id=178902
Part Number Memory Type Size Latency
TWIN3X4096-1600C7DHX G DDR3-1600 UDIMM 4GB Kit (2 x 2GB) 7-7-7-20-2T
TWIN3X2048-1066C7 G DDR3-1066 2GB Kit (2 x 1GB) 7-7-7-20-2T
TWIN3X2048-1333C9 G DDR3-1333 2GB Kit (2 x 1GB) 9-9-9-24-2T
TWIN3X2048-1333C9DHX G DDR3-1333 2GB Kit (2 x 1GB) 9-9-9-24-2T
TWIN3X2048-1600C10D DDR3-1600 UDIMM 2GB Kit (2 x 1GB) 7-7-7-20-2T
TWIN3X2048-1600C7DHX G DDR3-1600 UDIMM 2GB Kit (2 x 1GB) 7-7-7-20-2T
TWIN3X2048-1800C7DF G DDR3-1800 UDIMM 2GB Kit (2 x 1GB) 7-7-7-20-2T
Total 12V current - 12V2 - 6A (processor powered by 12V2)
12V1 - 9.5A + 0.6 + 1.5 + 0.5 = 12.1A (video, one hard drive, one CDROM)
If using a single rail output power supply = 18.1A on 12V
Total power check - 12*18.1 + 5*1A + 5*1.5A + 50W (mobo) + 5VSB*2A (standby) = 289.7W
So, you need a power supply with:
12V1 >6A
12V2 >12.1A
Power >289.7W
At least one 2x3 PCI Express connector, for the video card.
3.3V and 5V consumption is low enough, that most supplies can handle the 50W motherboard
load, plus the other 5V loads on the storage devices, without a problem. I'd want
to see at least 3.3V @ 20A and 5V @ 20A, just to cover bases. It is hard to predict what
split there will be between rails.
If using a lot of storage devices, the calculation has to be redone.
Note that your motherboard choice, doesn't radically affect my estimates. So if you
change motherboards again, the estimate stands. While I was able to get numbers for
the two Intel chips mentioned above, other chipset makers don't provide data, and
I have no way to correct my assumptions. (For example, people note Nvidia chipsets
running hotter, but I have no numbers to bump up any assumptions.)
The video card is listed as 9 inches long. There are two checks to be done. Will
the video card cover up the SATA connectors ? Will the end of the card bang into
the hard drive cages. When selecting a $50 case, check the dimensions available
inside. And a 9 inch dimension means you need a bit more space, to get the
video card into place. So more than 9 inches is needed.
Paul
