12v rails are driving me nuts, power supp. question

X

xXxRuinationxXx

New Member
ok
so yea you can see my pc from my other post

I'm running tri sli 512 ddr3 9800 black edition pci-ex's
requiring 26a on the 12 v rails

this is the power supply I just ordered, will it suffice?

Kingwin Mach 1 1000W Power Supply Modular Cables 20/24PIN SLI Ready

DC OUTPUT

Output Voltage +3.3V +5V +12V1 +12V2 +12V3 +12V4 +12V5 +12V6 -12V +5
Max. Load 24A 30A 20A 20A 20A 35A 35A 20A 0.5A 5.0A
Min. Load 1.0A 1.0A 0.8A 0.8A 0.5A 1.0A 1.0A 1.0A 0A 0.1A
Regulation ±5% ±5% ±5% ±5% ±5% ±5% ±5% ±5% ±10% ±5%
Ripple & Noise(mV) 50 50 120 120 120 120 120 120 120 50
Total Power 1000W continuous output @ 50C ambient temperature
 
X

xXxRuinationxXx

New Member
ok now what about this one

XFX DDR3 GX2 9800GTX black edition at 40a draw
with three of those on a

Kingwin 1000w ABT-1000MA1S
4x 20a rails
2x 35a rails

pass or fail?
 
hermeslyre

hermeslyre

VIP Member
Any decent 500-600w PSU can handle the GX2. Anything above is more than enough, case in point either of those units.

Edit: oh. Three. Wow. :p
 
hermeslyre

hermeslyre

VIP Member
Both that I need to learn how to read and yes, they're both fine for your purposes.

EDIT: assessment is taking into account the fact you can only SLI 9800gx2, not tri-sli it.
 
Last edited:
1

1Kurgan1

New Member
xXxRuinationxXx said:
ok now what about this one

XFX DDR3 GX2 9800GTX black edition at 40a draw
with three of those on a

Kingwin 1000w ABT-1000MA1S
4x 20a rails
2x 35a rails

pass or fail?
Click to expand...

Just count the amps, you already got them all there. 40xA x 3 = 120A

20A x 4 = 80A + 35A x 2 = 70A for a grand total of 150A. Won't quiet have room for a forth. Either way I would suggest not going with 3x 9800GTX's. No mobo on the market has 16x PCI-E for that 3rd slot. It would be more benefical to pickup a 9800GX2, save a little cash and pickup another 9800GX2 a little down the road.

hermeslyre said:
Any decent 500-600w PSU can handle the GX2. Anything above is more than enough, case in point either of those units.

Edit: oh. Three. Wow. :p
Click to expand...

I don't know about a GX2... If I'm thinking right that should take over 50A and most PSU's don't make over 20A on a 12V line, especially ones of lower wattage. So you would want to look for a 3 line 12V PSU and those start to get a little more pricey.
 
hermeslyre

hermeslyre

VIP Member
1Kurgan1 said:
I don't know about a GX2... If I'm thinking right that should take over 50A and most PSU's don't make over 20A on a 12V line, especially ones of lower wattage. So you would want to look for a 3 line 12V PSU and those start to get a little more pricey.
Click to expand...

GX2 has a 40a req., giving a quality 500w unit enough power to support the *required spec* GX2. In reality you might not even see a 40a draw under load, req specs are always generous.

You can find units that don't have the 20a per single Rail limitation, I would advise a single rail unit over any multi-rail, because of the dependent, trapped power with multi-rail PSU's, E.G. If you have a 3 line unit, one of those lines would be dedicated to the CPU, giving you only two lines for the GPU-HDD's-etc.
 
1

1Kurgan1

New Member
hermeslyre said:
GX2 has a 40a req., giving a quality 500w unit enough power to support the *required spec* GX2. In reality you might not even see a 40a draw under load, req specs are always generous.

You can find units that don't have the 20a per single Rail limitation, I would advise a single rail unit over any multi-rail, because of the dependent, trapped power with multi-rail PSU's, E.G. If you have a 3 line unit, one of those lines would be dedicated to the CPU, giving you only two lines for the GPU-HDD's-etc.
Click to expand...

Wow 40a only, I would have expected more, heck my old x1950 Pro wanted 28a. I would agree a single line is better, but I don't know of a PSU with a single line rating of 40a. Very few PSU's cross 20 on single lines.
 
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