作者： Jakub Rusinowski · 最后更新： 2026年7月21日
You checked whether your GPU can run that 70B model and it can't. Before you drop $1,600 on a new card, here's when renting a cloud GPU by the hour on Vast.ai or RunPod is the smarter move — with the exact break-even math and step-by-step guides.
You ran your specs through the GPU & VRAM checker, picked the model you actually wanted — a 70B, or a fine-tune — and got the verdict every enthusiast eventually hits: not enough VRAM. Before you spend $1,600 on a new card, there's a cheaper answer for most people: rent the GPU by the hour. This post is the short version of when and why. When you're ready to actually do it, jump to the step-by-step walkthroughs: How to Use RunPod and How to Use Vast.ai. Buying a GPU is a bet that you'll use it enough to amortize the cost. For a lot of real workloads, you won't: Fine-tuning is bursty — a few ho…