If powering any of the dual cards isn't an issue (planning to externally power them,) which pair would be better suited for fcpx? With prices of used 390x going pretty low around my area, I can buy two of them cheaper than what i've bought 2 rx 480 8GB for. Im currently running dual rx 480 on my 5,1 dual 2.4ghz, and my brucex benchmark is only netting me 19 seconds. I've read of people getting single digits with two 390x but mostly are from hackintosh builds so i was wondering if any of you actually rocking two 390x's can chime in as far as the performance you're getting with them for video editing and other gpu intensive tasks? I know i'm getting pretty terrible geekbench scores on the cpu side but thats another topic/issue i'd have to address somehow... Thanks again in advance to all of you! UPDATE: head over to post 53 for the tests that i did: Dual R9 390x 8GB or Dual RX 480 8GB for FCPX?