I wasn't aware that makes a difference... Will have to reconsider shooting everything in -I again.4k XAVC-I can be played full rez in Catalyst Browse on my 3 year old 21" maxed out Imac (L7,Nivida card, 16gb ram, G-Raid Thunderbolt editing drive.). Premiere CC struggles a bit with playback but usually is acceptable. I never shoot XAVC-L because it would stress the system a lot more.