4:2:0 chroma is supported, 4:2:2 and 4:4:4 are not supported.
I am checking if it can record 10 bit video and will get back to you.EDIT
8 Bit only.
Thank you. I am a bit disappointed tho. This card is so powerful, can run all games on almost highest settings but this hardware encoding has much worse color than the original 4:4:4 (my monitor works in that mode). It's still awesome that it can record 120 fps without almost any framerate drop. I'm waiting for x265 software to record at 240 fps. I haven't seen any yet. Do You have any info about that?
PS Hmm... I wonder if x265 will support better chroma sampling and higher color.