Power Macintosh 5500, 6500; Twentieth Anniversary Macintosh (TAM) - wiki

CPU
PowerPC 603e @ 225.00MHz (5500/225, 6500/225)
PowerPC 603e @ 250.00MHz (5500/250, 6500/250, TAM)
PowerPC 603e @ 275.00MHz (5500/275, 6500/275)
PowerPC 603e @ 300.00MHz (6500/300)
FPU onboard
System bus @ 50.00MHz; 64-bit

256k L2 cache installed from factory (5500/225, 5500/250, 6500/225, 6500/250, TAM)
512k L2 cache installed from factory (5500/275, 6500/275, 6500/300)
256k, 512k, 1MB aftermarket L2 cache modules available for all models

Memory
none onboard; 128MB max
2 x 168-pin 5v FPM or EDO DIMMs, 60ns or faster, no interleaving

Machine ID
512 (All 5500, TAM)
513 (All 6500)
Main logic board (5500/275, 6500/275) 820-0816-C
Main logic board (6500/300) 820-0816-C
512k L2 Cache DIMM (5500/275, 6500/275, 6500/300)
PCI Adapter Card (All 5500) 820-0689-A
2 Slot PCI Card Adapter (All 6500) 820-0795-A & 805-1396-B (bracket)
PCI Card Riser (TAM) 820-0774-01 / 630-1822-01
CSII Card Riser (TAM) 820-0768-02 / 630-1815-02
Rear frame - (All 5500) - 805-1480-A / 805-1481-A
Comm slot blank - 805-0829-A
LC PDS blank - 805-0830-A
PCI/video out blank - 805-1218-A
Video In blank - 805-0830-A / 815-1781
Rear frame (All 6500) number presumably concealed
LC PDS blank - 805-0830-A
Cooler - IERC 61417CB