Intel Core i7 X58 motherboards tested and compared

From techamok.com:

In terms of overclockability, we have two obvious winners: the Asus Rampage II Extreme and the Gigabyte X58-Extreme, both motherboards targeting the high-end enthusiast market. However, the reason why they're in the lead is because of the excellent BCLK overclocking results, which are, as already explained on the BCLK overclocking page, biased by the memory/cpu/voltage combination. As said before, nearly all boards (except for the Intel DX58SO) are capable of running 220MHz BCLK with the right cpu/memory/voltages: you can check the different overclocking forums for examples. If we take this into account and recalculate the scores using 220MHz BCLK for both DFI and Foxconn motherboard, we get the following results: DFI: 9905, Foxconn: 9931. That would make those two the best overclocking motherboards.