&gt; So it should apply to any system with discrete GPU memory, which is surely quite a few systems?<p>No smartphones, no tablets, only a small minority of notebooks (not a single macbook, e.g.), none of the business desktop PCs (which are by far the majority, volume-wise), no servers nor workstations (except those that have them installed for GPGPU purposes).<p>The exception are gaming laptops&#x2F;PCs (and those will need the VRAM for actual gaming) and servers&#x2F;workstations with dedicated GPGPU cards (which, again, would need the VRAM for GPGPU purposes).<p>That only leaves a few cases where you have beefy hardware and don&#x27;t use it, which isn&#x27;t significant enough for OS vendors to bother with. Thirdparty VRAM-as-RAM (or RAM disk) kernel modules &#x2F; FUSE layers pop up from time to time (this isn&#x27;t nearly the first), but they never gain any traction.<p>&gt; I guess those systems correlate with high-end systems with lots of system RAM anyway though...<p>Usually VRAM is less than a quarter of the system RAM, or even less. And usually those systems have so much system RAM that they have enough spare to make RAM disks an a valid option.