Generally speaking, I'm trying to determine if a given DisplayPort version will support difference display modes (resolution, refresh, and color depth). For this specific instance, I'm looking at the MSI Optix MAG274QRF-QD 27" monitor. I found a useful chart here that shows the bandwidth available to given DisplayPort versions - and according to it DisplayPort 1.2 supports 17.28gbps. Using some napkin math, a 10-bit, 1440p@144hz signal would consume:
10 bits * 3 colors * 2560 * 1440 * 144 = 15.925248 gigabits per second
By this measure this scenario should be fine - and for what it's worth I think 8+2 bit color actually only consumes 8 bits per color channel of bandwidth, not ten. However, in a review by rtings.com they mention specifically: "The max refresh rate you can achieve with a 1440p resolution and a 10-bit signal over DisplayPort is 120Hz..."
Not only does this disagree with the math above, it also doesn't make sense from a marketing perspective why this monitor would be advertised with these features but unable to use them. I checked the manual for the monitor itself and it lists 1440p@165hz as a viable resolution - but it does not mention color-depth.
Does DisplayPort 1.2 support 1440p@144hz with 10-bit color depth?