OK, I just bought a 4870 1gb card, thinking I wanted to do crossfire with my old 4870 512mb card, but I heard it might drop my 4870 1gb down to 512mb, is this true? If so, what setup is going to give me the most benefit?
yeah you'd only get 512MB, but thats still enough for resolutions upto 1920 x 1080.
In hinesight you should have brought another 4870 512MB and saved a few £, but you can still crossfire a 4870 1GB with a 4870 512MB, you'd just get 512MB of video memory, but like I said it doesnt really matter unless your running high resolutions.
You could also consider selling both of your cards and go for a HD5870 which wouldn't have any scaling issues, produce alot less heat, needs far less power and is DX11, But thats only really possible if you can get a good price for your 4870's or if you have some spare cash.
oh BTW a 5870 is roughly equal to crossfire 4870's
Thanks for the suggestions. I dont run any higher than 1920 x 1080, so I think I'm going to try it out and see what I get. I would love to have DX11 though... very tempting. My new card is still under the 30 return policy so I can easily opt for the 5870. Is the newer card worth the $$$ in your opinion?
well you can get a full refund on your 4870 1GB and if you can get a decent price for your 4870 512MB then yes I think its worth it to get the 5870. Personally I would go for the 5870 as I've had crossfire 4870's and they didn't scale well in many games, but that was awhile ago now, maybe things have changed.