Originally Posted by Chaob
WARNING for prospective buyers who want to use the UHD60/65 with a desktop PC:
I called Projector People who got in touch with Optoma prior to my purchase and asked if the UDH65 would work with a PC at 4:4:4 chroma (for clear text at 4k resolution) and the response they were given was that it would work with either 8 or 10 bit color depth at 30hz or at 8 bit only color depth for 60hz.
I received the projector today and what they said was true regarding 30hz but at 60hz only 4:2:0 was an option even at 8 bit color. I called Optoma and right away they said that it should work, so my hardware must be insufficient but as I gave them my system details (GTX 1070 which is also hooked up to a Sony 4k tv running 8 bit 4:4:4 chroma 60hz) they realized that my setup does in fact support it and then they changed their story and said that 4:4:4 support is "only for video sources... not PCs" (rubbish 4:4:4 60hz is THE setting you need for PCs, not video content).
So I just wanted to put this warning out there for anyone thinking they could use the projector for PC 4K 60hz 4:4:4 based on the specs that Optoma published. Great projector for everything else though for sure.
Did you try all HDMI ports? Only one is supposedly 18gbps.
"1xHDMI 2.0 (w/ HDCP 2.2, MHL 2.1 and Full 18Gbps)"
Plug it directly into the videocard, no AVR, and use a short HDMI cable. this is not the first time I've seen this problem on AVS.
Full 18gbps means 444 at 8-bit 4K60, and without 18gbps there is no HDR10 at 60hz (422 or 420) either which would be awful for games.
From the data sheet:
Color Depth 3840x2160
YUV 4:4:4 (8bit, 10bit, 12bit), YUV 4:2:2
(8bit, 10bit, 12bit), YUV 4:2:0 (8bit, 10bit, 12bit)
3840x2160 @60Hz YUV 4:4:4 (8bit), YUV 4:2:2 (8bit), YUV 4:2:0
(8bit, 10bit, 12bit)
I'm 99% sure you're not using the right 18gbps port. It's the only one with HDCP 2.2 so unplug your UHD Bluray player or whatever you have plugged into it now. Plug the PC in directly, it should work.