Windows will recognize a maximum of 8 GPUs installed on your computer, so you can have a maximum of 4 6990s, but you can only crossfire four of those GPUs. When you dont crossfire cards, they only work on rendering what is on the screen conncected to them, and you can specifically use them for GPGPU. Google search FASTRA. FASTRA II actually uses 13 GPUs, but requires a kernel and BIOS patch.
For your purposes, I'm assuming bitcoin mining, you don't actually need crossfire.
Topic: Is possible a 3 HD6990 crossfirex? (Read 1313 times)
Too much
2 6990's = 4 GPU's so no you cant run them in crossfire
Can I install 3 video cards in crossfireX HD6990?
There are some special crossfire bridge to do this with the HD6990 as they only have one crossfire connection where you can put a single bridge?
It is true that catalyst has a limit of 4 with three HD6990 GPUs can not handle the 6 GPUs?
It is true that Windows 7 has a limiting physical handle 4 GPUs?
If so, because there are boards for workstation with 7-16x pcie slots?, (Asus Supercomputer P6T7 WS Although it works if you use all 8x)
Thanks for you help
There are some special crossfire bridge to do this with the HD6990 as they only have one crossfire connection where you can put a single bridge?
It is true that catalyst has a limit of 4 with three HD6990 GPUs can not handle the 6 GPUs?
It is true that Windows 7 has a limiting physical handle 4 GPUs?
If so, because there are boards for workstation with 7-16x pcie slots?, (Asus Supercomputer P6T7 WS Although it works if you use all 8x)
Thanks for you help
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