You can use a Sandy Bridge chip on a Z77 straight out of the box, no problem. You can also use an Ivy Bridge chip on P67 and Z68 boards, but the P67 and Z68's require a BIOS update to make the IB chips to work on them. I see you already have a 2600K and a P67 Deluxe, so i'd recommend you NOT to "upgrade" to Ivy Bridge, it's not worth it at all if you already have a 2500K or 2600K etc... and a good P67 or Z68 board. Upgrading the board itself and keeping the CPU is ok for some, but your board is very good so i wouldn't bother with that either