HOW MUCH WATTAGE IS NECESSARY????

[mucho mangos]

Hello, I need help configuring my first pc build. It will mainly be for gaming (Battlefield 3, among other games). how big of a power supply is necessary for this build and possibly for future expansion using dual video cards??


Mobo: ASRock P67 EXTREME4 (B3) LGA 1155 Intel SATA 6Gb/s USB 3.0

CPU: Intel Core i5 2500k

Video Card: SAPPHIRE Radeon HD 6870 1GB

Case: Antec 300 Blk Steel ATX Mid Tower

PS: Antec High Current Gamer Series 750W <---------------------Too Much?

Memory: G.SKILL Ripjaws Series 8GB (2 x 4GB)

Storage: SAMSUNG Spinpoint 1TB 7200 RPM

Mouse: Logitech G500

 

[henydiah]

SAPPHIRE Radeon HD 6870 1GB power consumption 247W default and system not more than 250 W , i think you need 560 like Seasonic or Corsair VX550

PS: Antec High Current Gamer Series 750W is too much for single card HD 6870 and enough for Crossfire

 

[fjiekie]

most power supply companies have calculators to know what you need.
example: http://www.corsair.com/learn_n_explore/?psu=yes

 

[4745454b]

560W Heny? Way to much. A quality 450-500W PSU will be fine. 650-750W if you want to CF.

 

[henydiah]

560 to much he he. Just assume antisipate @OP do OC , he don't limit power

 

[nukemaster]

A 6870 will not take much over 160 watts under extreme load.

I would not call a 750 watt power supply overkill in the sense, but less efficient then running a good 450 watt psu.

The 750 is a good idea if you plan for a future upgrade.

At current, with a more power hungry cpu and video card, I have a hard time pushing 350 watts of power use(With prime95 + games).

 

[mucho mangos]

i do plan on crossfiring in the future. so will using a 750W psu now degrade my rig's performance in any way?

 

[henydiah]

No .. it's good and more power for single card

 

[mucho mangos]

thank you gents!!!

 

[mucho mangos]

Best answer selected by mucho mangos.