I've been running a v7900 with twin GTX 590's for compute for a while now and I'll just say it now:
you CANNOT run a FirePro for 3d tasks on one monitor and a geforce(s) for gaming on another simultaneously, even if secondary monitors are connected to the geforce.
You CAN however run Windows on one of the cards and have the other for compute. That is, you can simultaneously game on the geforce while programs utilizing OpenCL do compute tasks on the firepro (individual program compatibility varies).
If Windows is initialized on the firepro, it will do all DX and Opengl rendering throughout the os, even for monitors connected via the geforce (video signal is simply passed through the geforce).
I've tried doing setups where I'd have the Firepro drive one monitor for 3d modelling and the 590s in SLI driving another for games. It just doesn't work.
When I booted up a game on the monitor connected to the 590s, I observed that all of the gpu load was going directly to the firepro while the 590s were doing diddly squat.
When I initialized Windows on the 590s the opposite occurred: they'd do well for gaming, but also ended up doing the OpenGL viewport rendering on the monitor connected to the firepro while its gpu remained mostly idle.
Therefore, it'd probably be best to connect all of your monitors to one card and reserve the other for compute tasks, but don't expect to be able to game and model at once.
OS-wise, it's really easy to setup in Windows 7 (and should be just as easy in Vista or 8 since these os' are based off Windows kernel 6.X with natively supports multi-gpu driver installs).
Just install the drivers for both cards as you would with any build.
Yes and no. I've been running a FirePro as my primary graphics card and two Geforce GTX 590s as compute cards for a long while now and have made some interesting observations.
You can connect an additional monitor to your 240, but rendering will only be done on the card the OS is primarily using. That is, rendering would be done directly on your 550ti, then passed through the 240 to your secondary monitor, so your 550ti would be doing all the work for both monitors. Also, the secondary monitor will have some input latency to it since the 550ti would be sending data through the chipset and through the 240 to output to that monitor.
Dragging "demanding" windows from one monitor to the other can cause driver crashes or program crashes, though I haven't had this happen too often.
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