Dell inspiron 531s CPU compatibility

the max is the 6000+

AMD Athlon 64X2 Kit, 6000+, 3.0G, 2MX2, Dual Core, 89 Watt

dell part number:  WK983 for the 6000+

here the full list of what dell offers:

AMD Athlon 64X2 Kit, 5000+, 2.6G, 1MB, Dual Core, 65Watt

AMD Athlon 64X2 Kit, 4800+, 2.5G, 1MB, Dual Core, 65Watt

AMD Athlon 64X2 Kit, 4400+, 2.3G, 1MB, Dual Core, 65Watt

AMD Athlon 64 Kit, 3500+, 2.2G, 512K, 62 Watt

AMD Athlon 64X2 Kit, 4400+, 2.3G, 1MX2, Dual Core, 65Watt

AMD Athlon 64X2 Kit, 4000+, 2.1G, 1MX2, Dual Core, 65Watt

AMD Athlon 64X2 Kit, 4800+, 2.5G, 1MX2, Dual Core, 65Watt

AMD Athlon 64X2 Kit, 5600 , 2.9G, 512KX2, Dual Core, 65Watt

AMD Athlon 64X2 Kit, 3600+, 1.9G, 1MBX2, Dual Core, 65Watt, C1

AMD Sempron Kit, 3400+, 1.8G, 256K, 62 Watt

AMD Sempron Kit, 3600, 2.0G, 256K, 62Watt

AMD Athlon 64X2 kit, 5600+, 2.8G, 1MX2, Dual Core, 89Watt

AMD Athlon 64X2 Kit, 5200+, 2.7G, 1MBX2, Dual Core, 65 Watt

AMD Athlon 64X2 Kit, 5600+, 2.9G, 512KX2, Dual Core, 89Watt

AMD Athlon 64X2 Kit, 4050E, 2.1G, 512KX2, Dual Core

AMD Sempron kit, LE-1300, 2.3G, 512K

AMD Athlon 64X2 Kit, 5000+, 2.6G, 1MBX2, Dual Core, 65Watt

AMD Athlon 64 X2 5800+ Brisbane 3.0GHz 2 x 512KB L2 Cache Socket AM2 89W Dual-Core Processor

AMD Athlon 64X2 Kit, 6000+, 3.0G, 2MX2, Dual Core, 89 Watt