Can video ram be overclocked?

Ok, so I play all of my games with its "priority" set to "high" in the task manager. When I do this it almost always uses shared memory as vram. Now I am getting well over 4 gb in all games, the newer ones especially. Is it using the extra ram just because I have its priority set at high or is it in fact because it needs the extra ram? Would it use shared memory only if it needs it? The links you provid claims otherwise. NBA 2K18 uses about 5 gigs sometimes, while Hitman has used up to 6 gigs as vram for instance.

Ok, I recently spoke to a Geek Squad agent about the extra vram my games use, and he said that the game would never use shared memory unless it actually needs it. Setting its priority to 'high' or 'real time' in the task manager (shown below) only gives your PC the ok to do it. So all of those links you provided are in fact false. If setting the exe file as a high priority program is what we are supposed to be doing, we never got the memo from AMD or NVIDIA. Its proof that a 4 GB GPU is in fact NOT enough for the latest games that are graphically demanding. The reason why they are sold to us by these companies as such is because of the money and for no other reason. They know good and well that games these days are a little more power hungry than 4 GB's. This also shows why a lot of games will reccomend at least 16 gb's of system ram. Its mainly because the games might need some of it to use as vram. My games wouldn't be using up to 6 GB's as vram if it didn't need it. This is just how the PC works according to the real experts.

Now he claims that a game not getting the memory it needs wouldn't crash your game or PC, it would only cause the frame rate to drop. But considering that I've seen people bring up this issue of games crashing specifically due to lack of video memory, I still have my suspicions there. I may have just figured out why my games were randomly crashing so much over the last two years, because they haven't crashed since so far. I know this is highly likely the case because of Mass Effect Andromeda in particular. For one, the damn game is an un-optimized pile of garbage which isn't helping, and it crashed literally every single time on this one part of the game without fail. I tried literally everything known to mankind except make it a 'real time' priority, at which point it started using up 5 to 6 gigs as vram. This is the only thing that worked. If you think about it, video games are technically a high priority process, so the PC should recognize it as one. I highly suggest you all do the same for every single game if you don't want to give your PC another excuse to go haywire. I'm telling you something that these companies have neglected to mention and likely never will.