sli with different cards???

would it hurt performance if I sli a evga 7800gt co se with a 7800 gt co, I wasn't sure if it will hurt anything to use 2 different cards or if I should get a second co se as thats what I already bought. I have someone that wants to trade me a 7800gt co for my opty 165, if you guys think it won't make a difference then thats that.

the latest drivers DO allow for different cards to run in SLI.

like he said, yes, the latest drivers allow different cards of the same type, aka;

7800GT CO SE + 7800GT CO, or BFG 7800GT OC + eVga 7800GT CO SE.

I'm not sure the difference between the co and co se? faster clocks? anyways, if Card A can't run at Card B's speeds, put Card A in the top pci-e slot so that Card B will run at Card A's speeds, but if Card A can run at Card B's speeds, then put Card B in the first pci-e slot.

Thanks for the input, I think I might do it