Natalie Vock, a Linux developer for Valve, has recently taken to their GitHub with a simple fix allowing rigs with less VRAM to run games better. Turns out applications in Linux will hog all the resources they can get, though if you have an Arch-based distro with an 8 GB card, things are about to get better for you.
To put it simply, you will need to get "some kernel patches as well as additional utilities to make use of the kernel capabilities properly." Vock recommends using the Arch-based CachyOS and installing the packages "dmemcg-booster" and "plasma-foreground-booster." From here, your games should start to run better on graphics cards with 8 GB of VRAM.
As Vock explains it, during testing, their system tried to "use more VRAM than there was available at all, so something had to give. Instead of telling the app that memory allocation failed (which would mean a near-certain application crash), the kernel decides to kick some memory out of VRAM to make everything fit. This degrades performance."
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