What to look for in a motherboard?

[Tzar417]

I'm currently using an Asus P8B75-V, and I've had no qualms about it, but me being a little uninformed about under reached in the computer building department, I didn't realize it didn't support SLI, and I've been using dual GTX 460's for the past 5ish months without actually utilizing more than 1. I know they are a pretty weak card now, but I was hoping to get the most out of the both of them, because 1 I got for free. I'm just wondering what I should be looking for in a new motherboard, and if its even worth upgrading it to try to get better performance out of the cards, or to just upgrade the card and the board.

ASUS P8B75-V
8GB Corsair Vengeance @ 1600
Intel Core i5-3570k @ 3.4
GTX 460, Have a second, not running SLI
120GB Samsung SSD 840Evo
1TB 7200 RPM HDD
750W PSU, forget which one it is.

 

[animal]

in order to SLI, you will need a "Z" series motherboard (Z87) chipset. However, if you replace the motherboard, you may have to buy a new OS as well.