Adding another GTX 580

[Warmacblu]

Hi all, I currently have a single MSI GTX 580 Lightning Xteme and am looking to add another GTX 580. It is very difficult to find another one of these so I may have to settle with another card. What should I be looking for to match the MSI card? 3 GB of VRAM? Similar clock speeds?

Thanks for any help.

 

[g1xx3r]

Search the for sale threads,plenty of 580s for sale.Pretty much just match your vram.clock speeds can vary depending on if you overclock or not.Good Luck!