The Tiger uses a standard 20-pin ATX connector. The Thunder uses a proprietary 24-pin connector. You need a powersupply with a regular connector. Antec & Newegg's description is wrong as it just says "For Athlon MP" which is very misleading. Return it and get the 400-watt Antec or 431-watt Enermax or similar.
By the way, that 510-watt Antec doesn't even provide the suggested minimum 30-amps on the 5-volt line. Massive power on the 12-volt line, but only 29 on the 5-volt line. Just another reason to look at the true specs of a powersupply, not just the advertised wattage.