When enabling HDR in Game Mode on the Samsung G65B monitor, the gamma setting cannot be switched to ST.2084 (locked at 2.2), and the color gamut does not switch to DCI-P3 (locked at sRGB). This may also prevent the activation of the "Game HDR" (HGIG) feature.
Although the product page claims support for AMD FreeSync Premium Pro, the AMD software only recognizes it as "Adaptive Sync Compatible".
The graphics card used is an AMD Radeon™ RX 6600 XT.