PSU for X1950XT 256mb

[qsahmed]

I bought a Sapphire X1950XT 256MB PCIe Graphics Card..

Now i am looking to upgrade my PSU in order to run the GFX card properly.

I am confused abt the 12V Rails.

I think this crad requires 30A on 12V Rail.

I am thinking of Buying the Corsair VX450. but its quite expensive here in India.
If I buy a decent PSU that has multiple 12V rails with a total of 40A on 12V rails. Will it work properly?
Do I need to buy a PSU that has a Single 12V rail of 30A or can the combined amperes of the 12V rail will work??
What is the difference b/w Single 12V rail and Multiplr 12V and which one is better.

C2D E6750, 2G RAM, DG33FB Mobo. etc

please reply and help.

 

[spanner_razor]

Yeah you can have one with multiple rails and it should work fine, you can probably get away with 450 maybe a 500 antec or seasonic etc would be better.

 

[tonyp12]

This is what another manufacture says about there 1950XT:
450-Watt power supply or greater, 30 Amps on 12 volt rail recommended (assumes fully loaded system)


A forum post:
I'm currently running a X1950XT on 430W Antec PSU (the one that comes with the Antec Fusion case). No trouble to report. My system probably uses slightly less energy that yours (AM2 3800+ EE, 1hdd)

So it looks like 500watt power supply should be more than enough.

 

[Grimmy]

I guess I could try to help... PSU are not my strong sides, but here goes:

One thing to understand, is how loaded a system is. Or in other words if you only have one HD/DVD/2 fans (min setup) vs a full setup (meaning you use up all the MB can handle in components).

The 30A to me would be on a fully loaded setup. If you don't have much on the system to draw that much power, you can get away with a lower PSU, such as a 450w.

To understand how the Amps are converted to watts:

A x Voltage = Watts

30a x 12v = 360w on the 12v side

So you should be able to calculate the rest on the 3.3/5 volt sides to get a total of 450watts as an example. In this article:

Faster, Quieter, Lower: Power Consumption and Noise Level of Contemporary Graphics Cards - X1900 XT

You will see that the highend (1900 XT) uses 108Watts (roughly 9amps).

This article shows the X1950XT power consumption:

Red Revenge: ATI Radeon X1950 XTX

So in their test, it is using - 124 watts (roughly 10amps)

I hope that gives you an idea. I just hope I'm correct enough on those examples.