C51XE+MCP55PXE:
Supports Socket M2 FX & Athlon 64 processors, 2 x16
SLI slots (total 46 lanes, 9 links), Six SATA ports with RAID5, dual Gigabit LAN
with ActiveArmor and UAA Audio.
MCP55P SLI:
Supports Socket M2 FX & Athlon 64 processors, 2 x8 SLI
slots (total 28 lanes, 6 links), Six SATA ports with RAID5, Dual Gigabit LAN
with ActiveArmor and UAA Audio
MCP55 Ultra:
Supports Socket M2 FX & Athlon 64 processors, 1 x16
slot (total 20 lanes, 5 links), Six SATA ports with RAID5, Dual Gigabit LAN with
Active Armor and UAA Audio.
MCP55S :
Supports Socket M2 Sempron processors, four SATA ports,
one Gigabit LAN, UAA Audio

C51XE+MCP55PXE: Supports Socket M2 FX &
Athlon 64 processors, 2 x16 SLI slots (total 46 lanes, 9 links), Six SATA ports
with RAID5, dual Gigabit LAN with ActiveArmor and UAA Audio.
MCP55P SLI:
Supports Socket M2 FX & Athlon 64 processors, 2 x8 SLI
slots (total 28 lanes, 6 links), Six SATA ports with RAID5, Dual Gigabit LAN
with ActiveArmor and UAA Audio
MCP55 Ultra:
Supports Socket M2 FX & Athlon 64 processors, 1 x16
slot (total 20 lanes, 5 links), Six SATA ports with RAID5, Dual Gigabit LAN with
Active Armor and UAA Audio.
MCP55S :
Supports Socket M2 Sempron processors, four SATA ports,
one Gigabit LAN, UAA Audio