AMD XDMA requirements

[PC Joe]

I've got a Supermicro X8DTH motherboard with 7 x16 length PCIe 2.0 slots.

 

I've got a R9 390. It has the newer XDMA Crossfire over PCIe instead of a bridge.

 

Because the new link is over PCIe bus does the chipset have to be Crossfire compatible? I can't find any documentation on motherboard compatibility. Does the new XDMA setup even require anything other than  PCIe 2.0 x16 slots or better?

[ChrisCross]

2 hours ago, PC Joe said:

...

since amd cpu's have only pcie 2.0 x16 and can do crossfire i think your fine with that. but you do need crossfire certification. sever motherboards usually dont have that. if it doesnt stand anywhere in the documentation i think i have bad news for you

[David_K]

Problem is the license /certification, the drivers are blocking the use of SLI and probably the same with CF on a motherboard that is not "certified", so you need hacked drivers, and "Hybrid-SLI" is real thing, working ways around to enable SLI on motherboards without support for it, meanwhile probably every single consumer board that has an additional PCI-E X4 slot declares support for CF. So its not really something people care about I think.

 

The "X8DTH" at least according to a quick search doesn't support Crossfire.

 

On another note, as I understand this is a X1366 board, not sure that I would run 2 390's on a 1366 socket xeon with relatively low IPC.