You should try to match to what you have in looks for instance I need 1 more for my case but it is an Azza and the RGB is a ring so I have to buy a 3 pack of the Azza fans which is okay because I can put 2 in, as a push pull for my Thermaltake watercooler. Just type RGB fan in at NewEgg and/or Amazon and go with what looks right in your budget. But pay attention to RPM. about 1300-1500 is a good range.