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
9 answers Last reply Best Answer
More about wattage necessary
  1. 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
  2. most power supply companies have calculators to know what you need.
  3. 560W Heny? Way to much. A quality 450-500W PSU will be fine. 650-750W if you want to CF.
  4. 560 to much he he. Just assume antisipate @OP do OC , he don't limit power
  5. Best answer
    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).
  6. i do plan on crossfiring in the future. so will using a 750W psu now degrade my rig's performance in any way?
  7. No .. it's good and more power for single card
  8. thank you gents!!!
  9. Best answer selected by mucho mangos.
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