Sapphire AMD HD6970 crossfire with Sapphire AMD HD5870 good ideaa?

Hello again I would like to know if it is a good idea to run Sapphire AMD HD6970 crossfire with Sapphire AMD HD5870 and is it possible and how will the performance be?
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  1. I'm fairly certain you can't crossfire a 5870 and a 6970 as they are from different series, and infact use a slightly different architecture. Your best bet would be to just pick up another 5870 (I'm assuming this is what you have now?) and crossfire them together. 2 5870's is still more than enough to run everything very well.
  2. Different architectures, I'm pretty sure you can't crossfire those like Yargnit says. Even if you could, I'm not sure you'd want to anyway. I'd also be tempted to just crossfire the 5870 and wait until the next series of cards. A 5870 can be bought for buttons these days.
  3. That is wat I would like to do but I live in south afrrica and I can't find another ATI Radeon Sapphire 5870 Game Edition :( maybe I should try and get a HD 5970 and run the 5870 crossfire with the 5970?
  4. It doesn't have to be a game edition, any 5870 will do even one from a different manufacturer.

    What is your screen resolution that you desperately need so much power anyway? The 5870 is still a very solid card.
  5. But I want my pc to look nice and I just want crossfire so I can run 6 screens
  6. If you mean 6-screen eyefinity you'll need an eyefinity 6 edition card. Is that what the game edition is?

    Also if you want to run 6 screens you definitely want to get a 2gb card for the memory, or the 4gb 6990. I wouldn't recommend crossfiring the 5870 for 6 screens as the main bottleneck is the 1GB memory on it and having 2 cards won't make any difference to that.

    So yeah, get a 2gb single card or the 4gb 6990.
  7. But I am getting a pci-e 3.0 motherboard so both are going to run at x16 so they shouldn't bottle nick should they?
  8. there is no card that even comes close to using the bandwidth of a 16x lane... what pci e 3.0 mobo are you getting imo pci-e 3.0 will not matter for a while down the road
  9. madox750 said:
    But I am getting a pci-e 3.0 motherboard so both are going to run at x16 so they shouldn't bottle nick should they?

    When it comes to screen resolution the most important thing is how much onboard memory is on each card. Even though a crossfired 5970 and 5870 would have tons of shader power, they would struggle to power 6 screens because they would simply run out of memory, or frame buffer. A lot of the shader power would be wasted because without the memory to hold the information on all 6 screens, the frame rate would just crash. This is also why Nvidia cards struggle at the top resolutions unless they have 3 Gb per card. Even 1.5 Gb per card isn't enough in some games at very high resolution.

    With 6 screens you definitely need to get 2 Gb per card trust me.
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