AMD SEMPRON 3400 AMD Sempron 3400 Palermo processor is currently the most powerful Sempron processor available for Socket 754. The AMD Sempron 3400 has all of the main features expected with modern processors such as MMX, 3Dnow, SSE, SSE2, SSE3 and x86-64 support. Unlike the Athlon64 3400 the Sempron 3400 and Athlon64 3000 also have support for SSE3, the only negative aspect of the Sempron 3400 is that it has a 256K Level 2 Cache unlike the Athlon64 processors."