The Sun4 generations were (from memory):
sun4 - first generation SPARC, implemented as an FPGA. IIRC, speeds
topped out at about 20 MHz. PCI bus.
sun4c - 2nd generation, implemented in CMOS. SS1 and SS2 families.
Desktop machines only. Expansion via SBus. 40 to 80 MHz
sun4m - "SuperSPARC" - multiprocessor support. TLB MMU
sun4d - "Sun Dragon". Big iron, intended for high reliability. Based
on a bus architecture from Xerox PARC.
sun4u - UltraSPARC - 64-bit
There was also an ECL SPARC that never made it out of the lab.
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