AMD Crossfire combinations

[hibby540]

I have a 7750 that Windows sees as an R7 250, and they can crossfire. Are there any other models of Radeon that can do so? I am also searching for models that might have cards ranging from 128-bit to 256-bit that can crossfire. Is this such a thing?

*edit* I had an HD7750 and the I purchased a second one. The card shows almost all of the same markings, although upon close inspection (removing and cleaning the fans and replacing thermal paste) I noticed that the boards are arranged differently and that one cards coloration is brighter than the other. (The new cards coloration is that of the Ultimate edition of this SAPPHIRE card.) Is there any kind of fix to make Windows see the second card as an HD7750?

 

[Anonymouselite5]

With AMD as long as the cards have the same GPU core architecture they will be compatible with crossfire. E.G. A Radeon 7950 and a 7970 both have the same core architecture (I forget the name they called it) so can be crossfired, even though the 7970 has a higher clock and more compute units.
Can be seen here under specs: http://www.amd.com/en-us/products/graphics/desktop/7000/7900

In the same sense that an r7 250 is infact a 7750 but with a few little upgrades, and perform similarly, but still the same architecture.
So board arrangement isnt a problem, however you will be limited by the slower one and memory.

You can also crossfire r9 290x's with r9 390's, 7970's with r9 280x's and r9 270's with 7870's. 😉
However on the Nvidia side you cannot crossfire say a gtx 770 with a gtx 780. Has to be exact, a 1080 with a 1080.