Entry by realismbro285
Gigabyte GA-P55-UD3

Gigabyte GA-P55-UD3 Revision 1.0


CPU support

Supported sockets:
  • LGA1156
Supported architectures:
  • Intel Core i3 Clarkdale
  • Intel Core i5 Clarkdale
  • Intel Core i5 Lynnfield
  • Intel Core i7 Lynnfield
  • Intel Pentium Clarkdale
  • Intel Xeon Clarkdale
Note! Some steppings might require updated BIOS/microcode to work properly.

System memory

  • Type: DDR3
    4x 240-pin DIMM
Max supported: 16.00 GB
Official maximum is 16GB. Unofficially supports 32GB, do so at your own risk


Southbridge/ICH/PCH/MCP: Intel P55
SuperIO: ITE IT8720F
Realtek ALC888 audio IC over HD Audio bus
Realtek RTL8111D for 1G operation

Power supply

Main board power: 24-pin ATX
CPU power: 8-pin EPS
1 3-pin DC fan header
2 4-pin PWM fan headers

Expansion slots

3 PCI slots
1 PCIe x16 slot
1 PCIe x4 slot
2 PCIe x1 slots

Rear I/O ports

PS/2 keyboard
PS/2 mouse
10x USB 2.0 (480 Mb/s)
2x USB 3.0 (5 Gb/s)
1x RJ-45
Audio connectors: Line out, Line in, S/PDIF Optical out, Microphone in

Internal I/O headers

4x USB 2.0 (480 Mb/s)
Audio headers: Line out, Microphone in
Header for front HD Audio


1 IDE channel, up to 133 MB/s
4 SATA-II (3 Gb/s) ports
2 SATA-III (6 Gb/s) ports
Floppy connector, up to 1 drive

Circuit board

ATX form factor
PCB manufactured in the year 2010


Full version of P55-UD3R. Has USB 3.0 controller and Marvell SATA3 onboard.
LGA 1156 has the northbridge in the CPU. On Westmere chips, it is a second die on the package.



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