Question: what is g sync hdr?
Answer: At its CES 2019 keynote, NVIDIA revealed that it's essentially rebranding G-SYNC HDR displays as G-SYNC Ultimate. It launched the HDR program last year at CES, promising very high standards like G-SYNC variable frame-rate refresh rates at 144 Hz and higher, 1000 nits of brightness and a 95 percent DCI-P3 color gamut.