If you already have the computer for other reasons, such as gaming, are you paying for it to use it for a LLM? The limiting factor isn’t raw power either, it’s VRAM size. A GTX 1080 with 8Gb is capable of running some models. But an RTX 3060 12Gb can be bought new for really cheap and is more than enough for most people’s use at home. Raw GPU power only helps with the time it takes, but even if it took 12-24 hours, well, do you want it fast or do you want it cheap?