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Yeah i struggled with 4K for 18 months! At least there are cards at last made for it... best of luck nabbing one!
Dialled down my PC gaming awhile back after picking up a One S and then a One X but getting back into it slowly, need to upgrade my screen and AV amp so may just do them first, main PC screen is 1080p but also hooked up to my 4k TV via my amp which doesn't do 4k, One X is directly connected to the TV but want that via the amp too plus I've been toying with getting an Oculus which my 970 GTX would struggle with frame rate wise on anything newish.