Nvidia GreenBoost Lets You Fake More VRAM — And It Actually Kind of Works

There's a project sitting at the top of Hacker News right now with 277 points and climbing. It's called Nvidia GreenBoost, and it does something NVIDIA would really rather you not think about: it transparently extends your GPU's VRAM by borrowing system RAM and NVMe storage. A lone developer on GitLab built a CUDA shim — a thin layer that sits between your applications and the GPU driver — that makes your system RAM appear as additional VRAM. Your 8GB RTX 4060? GreenBoost can make it pretend it has 32GB. Your 12GB RTX 4070? Now it thinks it's got 64GB. And here's the part that's making people lose their minds: it actually kind of works. How It Works (And Why It Shouldn't Be This Easy) GreenBoost operates as a CUDA interposer — essentially a man-in-the-middle between your CUDA applications and NVIDIA's driver stack. When a program requests GPU memory allocation, GreenBoost intercepts the call. If there's real VRAM available, it allocates there as normal. When VRAM runs out, it transpare