650W great enough for two 4850's? and two 4850's on AMD board?

i was reading around and heard i couldnt run crossfire with two 4850's on an AMD board. is this true?
and would 650W be enough for two 4850's?

its a Corsair 650W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005

4850: (two)
SAPPHIRE 100245L Radeon HD 4850 512MB 256-bit GDDR3
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102770

thanks in advance.
6 answers Last reply
More about 650w great 4850 4850 board
  1. The power supply is sufficient, and of course AMD graphics cards can be crossfired on an AMD board, but only the AMD boards that have two PCI-Express slots and a chipset that supports it.

    Post your motherboard and we can tell you, or look it up at the manufacturer site.
  2. JuiceJones said:
    The power supply is sufficient, and of course AMD graphics cards can be crossfired on an AMD board, but only the AMD boards that have two PCI-Express slots and a chipset that supports it.

    Post your motherboard and we can tell you, or look it up at the manufacturer site.



    oh thanks. i forgot to post my motherboard here it is:
    http://www.newegg.com/Product/Product.aspx?Item=N82E16813138128
  3. You should be good to go.

    http://www.biostar.com.tw/app/en-us/t-series/content.php?S_ID=374

    # 2 x PCI-E x1 2.0 Slot
    # 2 x PCI-E x16 2.0 Slot (CFX x8)

    Only runs in x8 mode, but shouldn't matter much if at all:

    http://www.tomshardware.com/reviews/crossfire-pci-express,2095.html
  4. aj95 said:
    i was reading around and heard i couldnt run crossfire with two 4850's on an AMD board. is this true?
    and would 650W be enough for two 4850's?

    its a Corsair 650W
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005

    4850: (two)
    SAPPHIRE 100245L Radeon HD 4850 512MB 256-bit GDDR3
    http://www.newegg.com/Product/Product.aspx?Item=N82E16814102770

    thanks in advance.


    From ATI Radeon's Site:

    Quote:

    ATI Radeon™ HD 4850 System Requirements

    * PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard
    * 450 Watt or greater power supply with 75 Watt 6-pin PCI Express® power connector recommended (550 Watt and two 6-pin connectors for ATI CrossFireX™ technology in dual mode)
    * Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSU for a list of Certified products
    * Minimum 1GB of system memory
    * Installation software requires CD-ROM drive
    * DVD playback requires DVD drive
    * Blu-ray™ playback requires Blu-ray drive
    * For a complete ATI CrossFireX™ system, a second ATI Radeon™ HD 4850 graphics card, an ATI CrossFireX Ready motherboard and one ATI CrossFireX Bridge Interconnect cable per graphics card (included) are required

  5. "Only runs in x8 mode, but shouldn't matter much if at all"

    With x2 3870's on a SB600 board that had 2x8 I gained 25% 3dmark and about 30% in game fps going to a board with 2x16. With something like 4850's I'm guessing there is going to be a good deal of bottle necked performance that you'll be missing... If you haven't bought your cards already might want to look at the 4850x2
  6. Is that PCI-Express 1.1 or 2.0?

    I would find that very believable if it were 1.1, but PCI-E 2.0 at x8 is the full bandwidth of x16 PCI-E 1.1, and Tom's review shows little difference between P45 (8x8) and X48 (16x16) crossfire.
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