Considering its price level we are probably talking entry-1440p levels of performance or high 1080p levels of performance.
What uses that much VRAM at those resolutions?
I run my 12GB Pascal Titan X at 4k, and I've never seen VRAM usage go above ~5GB.
I don't know what games you are playing but I have seen plenty of new games maximize ram usage depending on how much is available. Even in the 2060 review [H] did, they saw it choke due to ram usage. If its graphically heavy game then it can easily reduce smoothness swapping in and out of memory.