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While MCP79 supports 2Gb DDR2/3 devices, MPC89E is able to support 4 Gb DDR3 device. However, MCP89E supports only 8 PCIe lanes instead of 20 on MCP79. Also, MCP89E has 2 digital display interface instead of 1 and supports both DisplayPort and HDMI. There is no support for PCI bus or serial port though. MCP79 supports 6 SATA Gen2 ports, MCP89E supports 4 SATA Gen3 ports. The core voltage is expected to be lower for MCP89E so we can expect lower power consumption.