Originally Posted by eawtan
Why not get another perc 5i ?
That doesn't even make sense. OP wants to know hardware that is compatible with his current perc 5/i.
For consumer grade hardware:
Any NVIDIA nForce chipset will work fine, I believe most AMD chipsets also work fine. However recent - 4 to 5 years i think - Intel chipsets have the SMBios conflict issue which need pins 4 and 5 covered on the card in order to boot properly and report correct amounts of RAM.
Read the huge Perc 5i Raid Card Tips and Benchmarks post for alot of really good information on both this card and the perc 6i. You will likely be able to find out many compatible mobo/cpu combos etc.