Minimum +12V current of 28A for 8800 GTX

[nazarioa]

Hi,

could you help if I'm going to have problems to run a single 8800 GTX unit with my PSU Thermaltake Toughpower 750W
http://www.thermaltakeusa.com/product/Power/ToughPower/W0117/w0117.asp

In the EVGA site it says it requires
...A Requirements
Minimum of a 450 Watt power supply.
(Minimum recommended power supply with +12 Volt current rating of 28 Amp Amps.)

In my power supply I it says +12 18amp see the link above.

Thanks....

 

[MAK-Daddy32]

It should be fine

from your link...

Next generation four +12V rails(12V1, 12V2, 12V3, 12V4) supports high-end graphic card and PC system (combined loading of 60A)

That PSU has 4 12V rails that EACH support 18A for a combined 60A.

 

[Doughbuy]

Meh, 18*60 >> 750...

TT doesn't list how much total amperage the 12V line can take, only that each rail can take a maximum of 18A, which is more than enough when you have 4 seperate rails. When they say 12V 28A+, they mean the whole 12V line, or how much total amperage the 12V line can handle. Here's an example:

You can see 4 12V rails at 18A each. But the total 12V line only goes up to 680W... 680W/12A = 56 and 2/3A, which as you can see is much more than the 28A they need for the 8800GTX. Couldn't find specs like that for the Toughpower, but I assume it's somewhat similar.

Your PSU is fine. Don't worry.

 

[nazarioa]

Thanks for your attention and help MAK-Daddy32 and also Doughbuy. I bought my PSU a couple of months ago and when I saw the specifications
from evga GTX 8800 I thought "what ***** I'll have to buy a new one"

You guys saved my day !

Thanks again !

 

[MAK-Daddy32]

You're very welcome - I've recieved lots of help from the Forumz, glad I could give a little back.

Doughbuy: Your math is a little off - you stated, "Meh, 18 * 60 >> 750..."

But, the real equation here is 12 * 60 = 720 < 750, me thinks you pulled the 18 from the 18A each rail is rated at and then muliplied by the manufacturers stated total amps for the combined 12 volts.

 

[Dahak]

No worries my friend.The TT tough power is a great psu and it will run a single 8800gtx.I think it would even handle two of them,although you might be pushing it at that.Anyways have fun with your new video card.I envy you.Goodluck.

Dahak

AMD X2-4400+@2.4 S-939
EVGA NF4 SLI MB
2X EVGA 7800GT CO IN SLI
2X1GIG DDR IN DC MODE
WD300GIG HD
EXTREME 19IN.MONITOR 1280X1024
ACE 520WATT PSU
COOLERMASTER MINI R120

 

[Crashman]

The card has two 6-pin connectors for a reason! You're dividing the load across multiple rails.

 

[Doughbuy]

Meh... screw it, haven't done basic multiplication for half a year now, I have calculators to do that for me... don't know how I got 5*12 in there... there are only 4 rails...

Yeah, 18A * 12V * 4 Rails >> 750W

So basically go by combined amperage yadda yadda yadda.

That seems better.