I know RAM isn't the same as VRAM
But its the fact that Shared Memory is used to substitute for low VRAM which increases RAM usage in those instances that it happens.
Shared Memory equals Half of your Physical RAM, so if you have 8GB RAM up to 4GB of it can be used for Shared Memory, so in systems with 8GB or less it can cause problems.
This is shown on the Task Manager/Performance/GPU section
So what i'm saying is
I don't understand why its never talked about in reviews, because while 16GB RAM and 4GB+ VRAM GPUs are the standard now there are still plenty of people with 8GB and less RAM and 3GB and under VRAM GPUs.
I think people with such systems should be made aware that in a case where Shared Memory is being used to help mitigate VRAM usage how their performance may be affected.
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I actually had this happen a few years ago with the game ARK
I had 8GB RAM and was using a 2GB VRAM GPU, because I didn't have enough VRAM to handle the games graphic settings Shared Memory was being used which caused my RAM usage to max out and as such caused slow downs when alt tabbing and so forth due to no free RAM.
And this was with a MINIMAL amount of running processes/programs mind you.
Once I upgraded to 16GB specifically for the RAM usage, all my issues went away and the game and system was running smooth as it had an adequate amount of RAM to be used.