Monday, July 13th 2015
You Can Pair an R9 300 Series GPU with an R9 200 in CrossFire
With AMD unifying the driver between the R9 300 series and the older R9 200 series GPUs, it's now possible to pair a Radeon R9 300 series graphics card with one based on a similar-spec chip from the R9 200 series. At launch, the R9 300 series and R9 Fury series had a separate driver branch from the remaining lineup, which was unified with Catalyst 15.7 WHQL. Now, you may pair an R9 390 or R9 390X, with an R9 290 or R9 290X.
You may even create a 4-way CrossFire setup with one each of the four cards. You should even be able to combine R9 380 with R9 285. AMD allowed similar cross-generation pairings in the past, such as those between the R9 280 series and HD 7900 series, and between the R9 270 series and HD 7800 series. The company's newer GPUs feature XDMA CrossFire, which does away with bridge cables, for increased flexibility.
Source:
VideoCardz
You may even create a 4-way CrossFire setup with one each of the four cards. You should even be able to combine R9 380 with R9 285. AMD allowed similar cross-generation pairings in the past, such as those between the R9 280 series and HD 7900 series, and between the R9 270 series and HD 7800 series. The company's newer GPUs feature XDMA CrossFire, which does away with bridge cables, for increased flexibility.
37 Comments on You Can Pair an R9 300 Series GPU with an R9 200 in CrossFire
So R7 370 with HD 7800 and R7 360 with HD 7790 are possible.
What Buildzoid said is correct
can someone read this www.pcworld.com/article/2947402/amd-catalyst-157-drivers-secretly-unlocked-crossfire-support-between-r300-and-r200-radeon-gpus.html and clarify above comment
and I think you do still need a crossfire bridge, the 370's still have the connectors for it, and you probably could crossfire with a 270 since its a pitcairn but I'm guessing sp's would get disabled on the 270 unless its one of those 1024sp 270's that came out later.