Should I buy a new GPU or used for mining Malairte?

Used is almost always the better value for home Malairte mining, provided you inspect carefully. The flood of post-Ethereum used GPUs has kept second-hand prices for cards like the RTX 3060, RTX 3070, and RX 6700 XT well below retail, and even after factoring in a thermal repad and repaste you typically come out ahead. The catch is that some of those cards were run hard for years. Ask the seller for HWiNFO screenshots, inspect fans and backplate in photos, and insist on a boot test before paying. A new card with a manufacturer warranty makes sense if you value the peace of mind, or if you are buying a current-generation GPU that has not yet hit the used market in volume. For most home miners on a budget, a carefully chosen used mid-range card is the right call.