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Absu
08-03-05, 10:58 AM
Hi everyone,

Decided to go with a 7800 GTX this time around. However I'm not very knowledgeable in the psu area.

Currently my 520w PSU is only pumping 20A to the 12v rail. The back of the box for my 7800 says required 22A on the 12v rail. I don't seem to be having any issues with the card atm but I want to make sure I can power the card properly.

I couldn't find any psu's on newegg that pumped over 20A on the 12v.. I did notice a few had two 12v rails, which added together go well over the 22A but i'm not positive you can add them like that to get the "required" 22A for the 7800 GTX.

Can anyone enlighten me and perhaps point me to a good psu to purchase?
I have a BTX case and mobo so the psu needs to support the form factor.
Its a Gateway 700GR (BTX case and mobo, etc) to be exact.

Oh and the leadtek 7800 GTX ROCKS! :D

Thanks for any help!

MUYA
08-03-05, 11:01 AM
well I have two Leadtek GTXs and I use the Antec 550W True Power II PSU....with no problems.

Having said that, look around the web for some in depth PSU roundups reviews.

Zurble
08-03-05, 11:02 AM
the required 22 A isn't for 7800 alone. it is for the whole system.
on dual rail u can indeed use 1 rail for the 7800 which needs arround 10 Amps alone.

but don't formalize too much on the numbers
i have an OCZ 520W with 28A on 12V and i am in an SLI CPU/GPU overclocked system. I still have room on my 12V rail.
on the 7800 box they says it require 26A single and 34A for dual (which means 1 more card needs 8 more amps)
on the nvidia site they says something else(30A for SLI), and in review others numbers too.

dilidolo
08-03-05, 12:38 PM
My 650W PSU pumps out 46A on 12v rail, well it comes with supermicro case.

Absu
08-03-05, 01:29 PM
I'll do more reading and looking.

Thanks guys for helping to clear all that up :)

dilidolo
08-03-05, 01:35 PM
Supermicro has 645W PSU with almost same specs, but much quieter.These are high quality PSU, I don't know how it stays against other PSU, but it's designed for servers and supermicro has track record for high quality components.

Power Supply

645W Low-Noise AC power supply with PFC
[ 24-pin, (4-pin, 8-pin) = 12V ]
AC Voltage 100 - 240V, 50 - 60Hz, 11 - 5 Amp

DC Output 5V + 3.3V ≤ 160W

+5V 30.0 amp

+5V standby 4.0 amp

+12V 46.0 amp

-12V 0.6 amp

+3.3V 30.0 amp

Absu
08-03-05, 04:08 PM
Cool, I'll check that out. Thanks Dilidolo!