How to crossfire two different graphic card series

Hello,
I have two asus EAH3870 Company of Heroes with both crossfire and have recently bought the Asus EAH5750 Formula. Can i CF the new one with the old one? I thought of taking one of the 3870 and replace with a new one and CF it with new one. Could it be done? My system info are: i7 920 2.67Ghz, 8Ghz DDR3 RAM,intel DX58SO motherboard,Enermax Galaxy 1000watt power supply, Creative X-fi Soundblaster sound card, 2.5TB WD,2x ASUS EAH 3870 CF.
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More about crossfire graphic card series
  1. You cannot crossfire 2 (or more) cards from different series. They have to be in the same series, for example you can crossfire a 5770 with a 5750.

    However you cannot crossfire a 5850 with a 5770, and you cannot crossfire a 3870 with a 5750
  2. Thx a lot buddy. so i need to buy another graphic card with same series for crossfire right.
  3. No problem, Yes you need to buy another 57xx series card if you want to crossfire.

    I would recommend you buy another 5750 and not a 5770 because the 5770 will be down clocked to the 5750's clocks, so you'd just end up spending more money for the same result.
  4. can you crossfire cards from the same series but different manufacturers? Lets say a Gigabyte 5770 with a Sapphire 5770?
  5. faune said:
    can you crossfire cards from the same series but different manufacturers? Lets say a Gigabyte 5770 with a Sapphire 5770?


    Yep, It doesn't matter what brands the cards are, as long as their the same series.
  6. Thanks, good to know. :)
  7. Which is better LCD or LED monitor? Which are the best brand?
  8. silvermushroom_82 said:
    Which is better LCD or LED monitor? Which are the best brand?


    Maybe start a new thread for that one
  9. 3870 CF 5750..
    i try it.. it works but the 3870 overburn (fan became crazy) to equal the 5750
    system said 5750 activated and 3870 off
    but resolution screen is base on 3870 properties
    its looks a little faster than 5750 only but i dont test anymore

    PS:i'm not an english speaker ^^'
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