System: Asus P8P67 Deluxe (Bios 3509), I7 3770k,  8GB G.skill Sniper 1600 C7, 2x Sapphire Radeon 7970(Driver:12.8+12.9 cat1) , Corsair ForceGT 120GB, Coolermaster silent gold Pro. Dell U2711(2560x1440), Windows 7 64bit

I'm going to guess that what you're talking about is streaming your game screen online while you play, and that you're asking if you can clone the display with different resolutions, so you can duplicate the output to a capture card that accepts 1080p, while still playing at 2560x1440.

I very much doubt anything like that is possible.  A duplicated display must be the same resolution from what I can see.

You're not going to find any consumer grade capture hardware that handles that kind of input resolution.

Your best bet is to fiddle with the software you're using to see if you can reduce the load, or try another package altogether.

There is a program called Ultramon that has a feature called Mirroring. this can mirror a screen at a lower resolution. the problem is it uses the CPU instead of the GPU which basically makes it record the screen twice if I then record the mirrored screen.

Also, Ultramon mirroring doesnt work with Crossfire.

System: Asus P8P67 Deluxe (Bios 3509), I7 3770k,  8GB G.skill Sniper 1600 C7, 2x Sapphire Radeon 7970(Driver:12.8+12.9 cat1) , Corsair ForceGT 120GB, Coolermaster silent gold Pro. Dell U2711(2560x1440), Windows 7 64bit