All of the boards feature support for DDR3 2600+ RAM and have two PCIe 2.0 x16 slots, D-Sub, DVI-D and HDMI outputs, 7.1 channel HD audio, one or more eSATA II/USB connectors, mounting holes for LGA775 CPU heatsinks, and are EuP-ready. The H55 Pro has additional overclocking features like onboard power, reset and clear CMOS buttons, and a digital POST reader.
The mATX boards are already available via Newegg for $99.99 (H55M) and $109.99 (H55M Pro) but I haven't spotted the H55DE3 or H55 Pro.
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