- Jun 10, 2011
The CX downsamples at 1080p when connected directly to the GPU via HDMI. The C9 doesn't have this issue. I wish someone would test the C9 with the CAC-1085 at 4K 120 Hz RGB.It might be an issue with the adapter doing the conversion from DP signaling to HDMI 2.1 signaling more than anything. We will know for sure when 3000 series cards get in the hands of LG CX owners.
These video format conversions are typically implemented as dedicated blocks on the ASIC / FPGA. Each combination of source & destination format needs its own block. If the designers run out of space on the chip, they may leave out uncommon resolutions.