Crossfiring 2 different cards...

Ok. I currently have a Radeon 4770 512MB. I thought about crossfiring it. If I decided to crossfire with a 4850 instead.. would I get at least the same results of crossfiring another 4770? Or would it be maybe a bit better?

Or... What if I crossfired it with a 4870 1GB ?? Would it cause the 4870 to run at 512mb since the 4770 is 512mb? How does this all work?
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  1. sanders4617 said:
    Ok. I currently have a Radeon 4770 512MB. I thought about crossfiring it. If I decided to crossfire with a 4850 instead.. would I get at least the same results of crossfiring another 4770? Or would it be maybe a bit better?

    Or... What if I crossfired it with a 4870 1GB ?? Would it cause the 4870 to run at 512mb since the 4770 is 512mb? How does this all work?



    http://www.tomshardware.com/forum/245454-33-crossfire-faqs

    i believe its alllll there :D
  2. xc0mmiex,thanks for posting the link of SLI/CF FAQ :)

    Guys plz read the FAQ before posting :)
  3. i'd still hold off and get the HD4770 when it is available. a lot less noise/power
  4. Yeah it doesn't really cover the question.. its ok though. I guess I deserved it..
  5. yes you can crossfire them, but don't as the HD4850 will slow the faster card down to its speed. get another HD4850/70 if you can
  6. So u guys didn't read the OP post ;) if u read it completely u will see that he said :
    "Or... What if I crossfired it with a 4870 1GB ?? Would it cause the 4870 to run at 512mb since the 4770 is 512mb? How does this all work?"

    And here is the answer from the FAQ :

    Do the cards have to be same model?
    I answer it with an example:
    You have a NVIDIA Geforce 7800GTX 256, and you want to add another card , the second card has to be 7800GTX exactly.

    But what about the memory? Can you add a 7800GTX 512 and use that with 7800GTX 256?
    It's recommended to use a 7800GTX 256 with a 7800GTX 256 and 7800GTX 512 with 7800GTX 512.
    However you can use a 7800GTX 256 with 7800GTX 512 , BUT the 7800GTX 512 will lower its RAM to 256MB to operate with the other card, so it wont have its true power. (This option isn't recommended. )

    So if u CrossFire 2 cards and one of them is 512MB and the other one is 256MB then in CrossFire mode the 512MB will lower its RAM to 256MB.

    Btw for your 1st question,not sure if u can CrossFire a HD 4770 with a HD 4850/4870 but even if its possible i dont recommend it,i recommend CrossFiring a HD 4770 with another HD 4770

    Hope this helped :)
  7. According to ATI's Crossfire Compatibility Chart, you can only setup crossfire using another HD 4770.

    -Wolf sends
  8. Thanks for the link:)will add it to the FAQ :)
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