AMD: 280 and 380 (no x) Crossfire?

[Emmonstein]

If I understand correctly (and I've searched for a plain answer, as much as I could) I should be able to run a 380(4gb) and a 280 (XFX, factory OC) in crossfire, correct? There might be some throttling on the 380, but I assume power and heat would be contained better as well; is it a huge amount of throttle?

Buying a 79xx or even a 280(x) is far more expensive than a 380. Also, I could manage to sell the 280 eventually, and pick up another 380.

Or am I beating around a bad bush?

I'm also working in 3D, UE4 and Zbrush. Things should work mostly fine as long as Xfire is supported, right? Maya, all the good stuff. (the first question is more important, could always dedicate a GPU to rendering and have a spare so my computer doesn't freeze solid)

finally. I have the 8320. Would this bottleneck the xfire setup? (I think not, buthey, if I'm asking smarter people for information, might as well go the whole 9 yards)

Thanks,
Chris

 

[Mac070]

Do you already have the 280 or 380?

 

[bignastyid]

The 280 and the 380 use different architecture so they are not crossfire compatible. The 280 is tahiti and the 380 is tonga. The 280 can only crossfire with a 280, 280x, 7950 or a 7970.

 

[Emmonstein]

The 280 and the 380 use different architecture so they are not crossfire compatible. The 280 is tahiti and the 380 is tonga. The 280 can only crossfire with a 280, 280x, 7950 or a 7970.

Curious tho, Directx12 offers multi-GPU support. Apparently enabling something like Nvidia and AMD together; although pointless kinda. Aside from offering cuda+superior openGL and DX12 support combined. But I don't think it's so binary

For the other guy, I do own the 280, it's the XFX not black edition.
Not so worried about running them in sync, so much as being able to use my computer while I'm rendering. But there comes into the issue, most rendering for AMD is best on CPU; am I wrong? Do we have any idea if DX12 or mantle are offering anything with an edge in this field.

I'm more interested in Zbrush and 3D applications than gaming