Aoostar WTR Max Increase VM GPU VRAM

Fri, 23 Jan 2026 00:00:00 GMT

Issue

AMD 8845HS internal GPU can use RAM as VRAM, but the linux kernel by default will only allocate 50% of total RAM due to safety concern.

This is too conservative and a waste of RAM just sitting there.

We would like to find a balance between system stability and utilization of the RAM.

Calculate maximum RAM you want to used as VRAM

Typically we keep 8GB RAM as system RAM to keep it stable, you can adjust based on your needs.

So in this case

$$64GB - 8GB = 56GB$$

$$([size~in~GB] * 1024 * 1024) / 4.096$$

sudo nano /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="amdttm.pages_limit=<setting_value> amdttm.page_pool_size=<setting_value>"

sudo update-grub

sudo reboot now

sudo dmesg | grep -E "amdgpu: .*VRAM|amdgpu: .*GTT"

You should see something like this (my dmesg log has be cleared out, use journalctl instead)

Now you have

$$ 2GB + 58GB = 60GB$$

of usable VRAM

you can use it to run large LLM model, or run multiple LLM model, etc