> So it should apply to any system with discrete GPU memory, which is surely quite a few systems? No smartphones, no tablets, only a small minority of notebook

> So it should apply to any system with discrete GPU memory, which is surely quite a few systems? 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). The exception are gaming laptops/PCs (and those will need the VRAM for actual gaming) and servers/workstations with dedicated GPGPU cards (which, again, would need the VRAM for GPGPU purposes). That only leaves a few cases where you have beefy hardware and don't use it, which isn't significant enough for OS vendors to bother with. Thirdparty VRAM-as-RAM (or RAM disk) kernel modules / FUSE layers pop up from time to time (this isn't nearly the first), but they never gain any traction. > I guess those systems correlate with high-end systems with lots of system RAM anyway though... 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.