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This is different than most of the other multiple-GPU questions I've seen. I am building a system that will be a gaming/rendering machine (Win7) and a programming/work machine (Ubuntu).

I've always preferred AMD/ATI cards for Linux due to the open-source drivers available, but I would like to take advantage of the CUDA cores for Adobe Elements, possibly building a small render farm in the future.

What I want to know is can I have 2 nVIDIA cards installed on the mobo, and have them active when I have booted into Windows, but upon booting into Ubuntu, have the AMD cards become active? Are there BIOS settings/other ways to accomplish this? I'm looking at using an EVGA SR-2 Classified mobo.

I realize that this might not be 'practical' from a cost standpoint, but I'm not really worried about that for this project.

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What are going to connect your monitor(s) to? – David Schwartz Oct 17 '12 at 17:12
A good point, but solvable by using a monitor with two (or more) different inputs and two cables. – Hennes Oct 17 '12 at 17:25
Yes, I'll hook up one to DisplayPort and one to HDMI. With two monitors, not too big of a deal. Could also be solved by a KVM switch – SSumner Oct 17 '12 at 19:28

This is definitely possible, with the caveat that your monitor have two inputs (which apparently it does). Just only install the relevant drivers in each OS. I can't say whether it will work without some X config, but it might. Make sure to switch inputs before starting the os.

I had a similar setup with two nvidia cards, using one that was supported in Linux (with nouveau), and the other only in Windows (showed the other, but only enabled for one). I only had one output, so I had to switch it manually.

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But will it work with ATI/nVIDIA? It sounds like it would, but do you know for sure? +1 but I'll hold off accepting for now. – SSumner Oct 18 '12 at 13:07

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