PSU Good for 9600GT or 8800GT?

[sc2071]

Damn, I thought I had finally came to decision which card to get, then the PSU question came up.

I can't find hard facts about the PSU requirements for either the 9600GT or 8800GT, but Google searching seems to suggest about 26amps on my 12v rail... if I got my terms right.

I have a Enermax Liberty 620w PSU. From reading the specs on NewEgg.com, I think I only have 22amps on my rails. That's not good!

http://www.newegg.com/Product/...x?Item=N82E16817194004

Funny enough, AMD has a nice page where you can see for certain if your PSU will power their cards, and mine it says will support the 3870.

Anybody have insight into this issue?

Thanks!

 

[yepp]

Your PSU has dual 12v rails, both rated at 22amps with a combined amperage of 36amps. So you really have nothing to worry about.

 

[sc2071]

Forgive my "dumbness", but assuming a "rail" is basically one of the outlets on the PSU, that goes through a cable to power the graphics card. Now if each one only gives out 22amps and I'm not able to plug in two cables into the graphics card, then how to I get the benefit of 36amps?

Also, lets assume that somehow the PSU is intelligent enough to see that I'm only using 1 cable, therefore it gives me the 36amps through one cable. Does that mean that it I were to ever go SLI, I would cut the amps down to 22amps per cable, thus meaning that this PSU is no good for a 9600GT SLI build?

Thanks again!

 

[BlueAcolyte]

12 (voltage) x 22 (amps) = 264 (watts) The 9600GT or 8800GT require 1 6pin PCI-E connector, so that's a max draw of 150w (unrealistic, but ok). So that takes about 12 amps (144 watts/ 12 voltage) which leaves you 10 amps (120w) on that rail. The combined output means that the PSU cannot put out 22 amps on both rails at the same time. (44amps x 12 is 528 watts on one voltage, there are about 3-4 voltages (3.3v, 5v, 12, 5svb, etc)

Clearly you have enough power. Also, Nvidia means 26 amps for the entire 12v rail, you have 36.

I'm pretty sure if you were careful, you could also do SLi (rail configuration)

Oh, and the 22 amps is a limitation placed on each rail. Each 12v rail cannot do more than 22 amps period.

 

[ajaidevsingh]

As said above u got notting to worry about. I have just made a similar set up with SLI 8800 GT and 700 W SMPS.