NVIDIA GeForce GTX 760 performance check

Moderators, my apologies if I’ve posted this in the wrong section.
I finally managed to track down the card mentioned earlier, but there is an issue. It reports 2GB of dedicated memory and 2GB of shared memory, yet whenever a game requires 4GB, it shows as unavailable.
HELP

Where exactly are you seeing that? Which program are you using?
Did you check during gameplay? Try something like MSI Afterburner.

Take GTA V, for instance. When you're adjusting the graphics settings, the scale goes up to 2GB. Back in 2017, I set everything to Very High, and a window popped up telling me I needed at least 3GB.

Besides those warnings, have you actually monitored the VRAM usage during gameplay using something like MSI Afterburner?
Did you double-check to make sure you're running the 4GB version? You should verify that with Speccy, GPU-Z, or a similar tool.