The main difference is that the Z87X-OC Force is equipped with a PLX PEX8747 chip that can double the 16 PCI-Express 3.0 lanes from the CPU. Because of that, the four orange PCI-Express slots can be configured 16/0/16/0, 16/0/8/8 and 8/8/8/8 which supports 4-way SLI and 4-way Crossfire. The black PCI-Express x16 slot is directly connected to the CPU, so if you have one video card you want to overclock you have 0 extra latency. It's a clever solution we've seen before with MSI and ASRock.
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