Hello,
All AMD K8 processors support SSE2, that is AMD Athlon 64, AMD Athlon 64 X2, AMD Sempron (Sockets 754, 939 and AM2), AMD Turion, AMD Turion 64, AMD Turion 64 X2 etc.
The AMD K7 processors don't support SSE2, which include AMD Duron, AMD Athlon, AMD Athlon XP, and the early AMD Sempron processors on Socket A.