How large of a power supply do i need for the 4870X2?

[crimson1566]

I'll be building a pc with one 4870X2, what type of power supply should i get. The rest of the pc is as follows.

case:
Antec 900
http://www.newegg.com/Product/Produc...82E16811129021

CPU:
Intel Core 2 Quad Q9550 Yorkfield 2.83GHz 12MB L2 Cache LGA 775 95W Quad-Core Processor
http://www.newegg.com/Product/Produc...82E16819115041

MOBO:
ASUS P5Q Deluxe LGA 775 Intel P45 Intel Motherboard
http://www.newegg.com/Product/Produc...82E16813131297

Power Supply:
Antec TPQ-850 850W Continuous Power ATX12V / EPS12V SLI Certified CrossFire Ready 80 PLUS BRONZE Certified Modular Active PFC Power Supply
http://www.newegg.com/Product/Produc...82E16817371009

Memory:
OCZ Gold 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Quad kit Desktop Memory Model OCZ2G8008GQ - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227290

Video card:
SAPPHIRE 100251SR Radeon HD 4870 X2 2GB 512-bit (256-bit x 2) GDDR5 PCI Express 2.0 x16 HDCP Ready
http://www.newegg.com/Product/Produc...82E16814102768

 

[jokers_greg]

That PSU is more than enough, it may even be able to handle a 4870 for tri-fire. Just a suggestion, I'd save the money from a P5Q-Deluxe and get a P5Q-E, almost no difference, just a few (imo) useless features.

 

[Brando]

According to AMD's site, a Corsair 750 watt can handle 2 hd4870 x2's. Maybe it's a typo since they have 850w units on the same page that can only handle one of them (supposedly).

 

[kkpudge7]

It wouldn't surprise me if the tx750 could supply juice for 2 of them. for what its worth i'm running 2 4870 1GB in crossfire with my rig oc'd to 3.6Ghz on my tx750. Its been running like a champ for 3 months. To be safe i would go with the tx850 for the x2 though, if your want to go corsair.