im wondering what performance i would get from on r9 270x 2gb and crossfireing a r9 270x 4gb together and what psu would i need (btw both cards are from the same brand)
ok last thing should i just get another 2gb one then?
If you have a 2GB one right now get a 2nd 2GB one.
could i crossfire it with a different brand r9 270x
Yes you can, the brand ASUS, MSI, EVGA etc the only difference between them are the cooling and stock clock speed, you can even crossfire with a R9 270 (No X) just keep in mind that the clock speed of the R9 270x will go down to meet the R9 270, same goes for 2 x R9 270x if one has a lower clock speed the higher one will go down to meet the lower one