Upgrading Graphic Card 4850-->7850

[Cotangent]

Currently I have...
Processor: Intel Core i7 950 @3.07
Motherboard Stuff
Pegatron Corp.
Model: Truckee 1.03

Memory: 12G of DDR3
GPU: Radeon HD 4850
1TB Hard drive
250GB Hard drive

Card reader, bluray r/rw,and dvd r
Power Supply Model:HP AcBel API5PC57 460W

I wanted to upgrade to the Radeon HD 7850

What kind of power supply would I need?
uhm What is the difference between single rail and multi-rail...etc?

 

[Cotangent]

Radeon HD 7850: http://goo.gl/4Xa37

 

[randomkid]

I see you have made duplicate thread. I provided the response the first.

Perhaps the moderator can just merge this topic with that one:
http://www.tomshardware.com/forum/356466-33-need-chosing-power-supply

 

[inspector71]

Your power supply may work. But I would go with a 550 watt to 650 watt psu to be on the safe side from looking at your specs.

 

[dosdecarnitas]

the video card plus a SSD would do nicely

a SESONIC X650 would work splendid

 

[teej]

I just got a 7850 OC edition which i'm using with a antec truepower new 550w psu and it's running without issue so far. Haven't stress tested it or benchmarked it yet but i've demoed a few games and can play everything maxed out at 1920x1080 and with eyefinity on two monitors. I think i read of someone using one with a 430w psu but it was a good quality one.