Hey...Sarah is Back!
i want to run a HD 4670 and a HD 4890 in crossfire x. Can it be done?
In short .. no.
Yes you can. All same generation Radeon cards since the HD 4xxx series can be Crossfired.
http://game.amd.com/us-en/content/ [...] _chart.jpg no, you can't.
Ah, so it's limited to the same 3 digit model number.