486 models had a selectable bus architecture (SelectaBus) through a replaceable riser-card, offering the choice of either VESA Local Bus/ISA or PCI/ISA.

Within the 300 series the following models appeared: Its last sub-model used the Pentium P54C processor clocked at 100, 133, 166, or 200 MHz.

It had in its latest version, the 6577, one DIMM-168 and 4 SIMM-72 memory slots, and featured an IBM SurePath BIOS.

The DIMM-168 memory slot takes 5V EDO DRAM and is incompatible with the more commonly used 3.3V SDRAM.

Like its smaller cousin, in its latest version it had 1 DIMM-168 and 4 SIMM-72 RAM slots, and featured an IBM SurePath BIOS.

Submodels were: The PC 360 was an ISA/PCI-based system with six expansion slots that uses the Pentium Pro CPU clocked at 150 or 200 MHz.

It had 4 SIMM-72 slots for a total of up to 128 MB of memory, and featured an IBM SurePath BIOS.

It had 4 DIMM-168 slots for a total of up to 512 MB of memory, and featured an IBM SurePath BIOS.

Initial systems had selectable bus architecture (SelectaBus) through a replaceable riser-card.

It has a Pentium processor clocked at speeds ranging from 100 to 166 MHz and was shipped with a Mwave modem/sound card.