Macintosh LC 580, 630; Quadra 630;
Performa 580CD, 588CD, 630, 630CD, 631CD, 635CD, 636, 636CD, 637CD, 638CD, 640CD - wiki

CPU 
68040 @ 33.33MHz
FPU onboard (Quadra 630 only - other models can add FPU by swapping CPU)
System bus @ 33.33MHz; 32-bit

No L2 cache is onboard; upgrades?

Memory
4MB onboard, 70ns
1 x single or double rank 72-pin SIMM, 80ns or faster; 132MB max (All 630 except DOS, 630CD, 635CD, early 636/636CD, 637CD, 638CD)
1 x single or double rank + 1 x single rank 72-pin SIMMs, 80ns or faster; 196MB max (580, 630 DOS, 631CD, late 636/636CD, 640CD)

Operates in 32-bit addressing mode. Will not operate in 24-bit addressing mode.

Machine ID:
98 (Quadra 630, LC 630, Performa 630, 630CD, 631CD, 635CD, 363, 363CD, 637CD, 638CD, 640CD)
99 (LC 580, Performa 580CD, 588CD)

Main logic board (All 580, 580CD, 588CD, All 630 DOS, 631CD, late 636/636CD, 640CD) 820-0624-A
The DOS-equipped models relocate the 68040 processor; this one (640CD) moved directly on board for this photo.

DOS Compatibility Card (All 630 DOS) 820-0617-B / 820-0618-A / 820-0594-B (Sound module)

Rear frame - 805-0855-B / 805-0874-B
Comm slot blank - 805-0829-A (not pictured)
LC PDS blank - 805-0830-A (not pictured)
PCI/video out blank - 805-1218-A
Video In blank - 805-0830-A / 815-1781

Rear main logic board bezel - 815-2074 A (pictured joystick port badge affixed on all DOS equipped systems)