The ASRock  H55M Pro comes with 2 PCIe full length slots, 1 PCI and 1 PCIe x1 slot. The two slots can work together to support CrossFireX or Quad CrossFireX. The x16 slot was from CPU side, it's PCIE 2.0. The x4 slot was from H55 PCH, it's PCIE 1.0. Beside, the x1 slot is also PCIE 1.0. To it's right is the power phase. Behind the slots are the GbE and audio codec chipsets.

On the bottom left hand corner, we can find the USB connectors for external brackets,. The H55 chipset is attached with a passive heatsink. To the right is 5 SATAII ports, 24 pin power connector and 4 DIMM slots.

On the back panel are the PS/2 Keyboard, 4 USB 2.0 ports (or 3 + 1 Power eSATA), 1 1394, 1 GbE, 1 DVI-D, 1 D-SUB, 8 ch audio ports