Building a personal rig mainly for running coding LLMs locally (inference,maybe light fine-tuning). Already have the motherboard/rest of the platform sorted — just deciding on the GPU. Three options I keep coming back to: Modded RTX 4090 48GB (Chinese clamshell mod) — I have an eBay offer at $3,500. 48GB GDDR6X, full AD102, ~1TB/s bandwidth, and obviously CUDA. The catch: third-party firmware, no real warranty, blower cooler, and general "is this thing reliable long-term" n...