[TL;DR] I flirted with a 4060 laptop, friend-zoned my CPU, and now both ghost me at 8 a.m. Act 1: PyTorch pins every tensor to CUDA. Act 2: CUDA runs out of memory, falls back to CPU, moves at geological speed. Act 3: I reboot, they sync, and the loss finally drops—exactly one epoch before I graduate. Moral: never date hardware you can’t cool.