ok before you tell me i do know this should be in the "off topic" part of the forum but i thought i would more likely get an answer to a PC question in the PC area.

ok so the question is that i currently have two nvidia 260 cards with DX10 surpport in SLI and  soon im upgrading to GTX 580 with DX 11 but i can't afford to buy two of these straight out so i was woundering if i acn rig one of the 260 cards in SLI with the 580 and still run DX11 or will i have to just run with the 580 until i can get another one

thanks in advance for any help you can give