Question Installed Ram at 24GB but only 11.9 Total Physical Memory?

Apr 17, 2021
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Hi,
I recently installed better RAM for my PC, and I have them installed in the A,B,A,B pattern with my other two RAM - since a friend suggested that may be why my PC wasn't using all my RAM. But it still says that 24 GB of RAM is installed but there's only 11 Physical Memory.

I'm really clueless when it comes to PCs, so any help is really appreciated (and wanted!). My main problem is that whatever game I play, it crashes after a few minutes and forces my PC into the BSOD and I read that it is likely due to memory fault (RAM), but my computer never had this sort of problem before.

NVIDIA GeForce GTX 680 is my GPU, if that helps, and I'll include an image of my Resource Monitor (Memory).

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