+1 for my future rig

Yes please, reading this explains to me why i have such *** fps with 2 cards and 5 screens

I really don't understand the problem here, the card that the window is running on (ie the monitor) is the card that does the rendering.  To change the card that the game is being rendered by simply drag the window to another monitor.

Alternatively have your clients icon on the desktop of the monitor that you would like the client to start on.  of course to do this you need to be running in windowed mode (you are doing that are you not?)

Also your little know fact is definitely not little or unknown that is absolute basics of multi-gpu rendering as it is currently implemented. I also take it that you are not running 6xxx series cards then as if you were you could run all 3 monitors of the on card (display port).

All adding a render device option ingame will do is tell windows which monitors to exclude, you will also need to specify an attached monitor as well as card for that to work as you would like.
It is impossible with out coding to use cuda / OpenCL to offload processing then send results back to the primary card through the bus completley un-optimal and full of bottlenecks, or use crossfireX.

Then you have other problems i currently run 2 1080p screens off a 6870 and 2 1280x1024 screens on a 9800GTX (I have been running multiple monitors for over 12 years now) with no performance issues running clients on any combination of screens, I can also see the gfx load move from adapter to adapter as the window moves.

Your initial statement was that you were *unable* to run more than 2 monitors per card that is obviously not the case and is only due to the fact that you do not have suitable components to do so.

The simple way to manually assign the resources is to move the window to a separate monitor.  You should have started of with defining the problem you actually have and then postulating your solution.

I would hazard a guess that the performance issue you are seeing right now is in fact exactly what you are identifying, however the cause will most likely be a result of spanning 2 monitors (and 2 cards) or some quirk of your system configuration / drivers.  The low FPS has been a Direct-X issue for many years when you attempt to display a 3d render across multiple display devices (recent cool stuff from ATI has worked around this some what but only for single output devices).  Running multiple clients on separate cards with v-sync disabled has no impact on fps for myself and a number of other people I know who are running multi-monitor setups.

Awesome

Great work love your style DEV's

Please add this to the patch notes. Thank you.

Ok i must be doing something wrong but i cant get Perpetuum to run on my second screen through my 6970 unless i drag the window over.

For two card to work fully independent, you have to turn off CrossfireX in your Catalyst Control Center (CCC).  Then you have to connect one monitor to each card (or @=1 or 2+2) and add the startup parameter to each client shortcut to designate which card the should be rendered on.

Then as a final act, make sure you move your client windows to the correct display. Correct being the display matched the card being rendered on.

You may need to turn vsync off as I needed to to have the maximum effect. Mine setup works on windows 7, and also uses dual ATI cards. Your setup doesn't seem to be too different from mine, so should work just the same.

PS.

You can leave the CrosFire bridge between your cards connected, just disable crossfire in the CCC and reboot, thats all the hard work really.

There's an interesting possible issue which I thought of about a minute ago - I do a sanity check on the stored window coordinates before opening the window to make sure your window doesn't get opened in your kitchen and you wondering WTF is going on. However, my theory is that if you have a multi-desktop setup, then it's possible that your desktop doesn't start from (0,0) but from some negative value (which I clamp back to 0 for the above reasons).

Sweet so does this mean i can now run 3 client each on its own monitor running on the one graphics card? (6970)

If so how do i set it up?