Greg,
Athlon 64 2800 = socket 754, 512KB L2 cache, 1.8GHz
as for the A64 3200+, well, there are three versions out in the wild...two of which are readily available:
Athlon 64 3200 = socket 754, 512KB L2 cache, 2.2GHz
Athlon 64 3200 = socket 939, 512KB L2 cache, 2.0GHz, but dual channel...