The only GSync HDR monitor on the market is a paltry 27" with a 4ms response time, yet costs $2000. The previously linked Freesync HDR monitor is 28", has a 1ms response time and is only $400... So, with HDR capable GSync modules, while we don't know the exact cost for said module, it's likely more than a $150-200 premium over Freesync HDR monitors.