Originally Posted by HammerON
I think so as well except that the specs for the ASRock Extreme4 and th Gigabyte do not support 2400 MHz according to their spec sheets....
If meaning 'officially' support, then no, but my Extreme4 runs 1866Mhz and have seen a similar rig (same board) hit 2133MHz. No reason they won't go higher. Can't really speak for the Gigabyte board, but at that price, you'd hope so.
From ASRock website, Z77 Extreme4 specs: - Supports DDR3 2800+(OC)/2400(OC)/2133(OC)/1866(OC)/1600/1333/1066 non-ECC, un-buffered memory.
Gigabyte website, Z77X-UP4: Support for DDR3 2800(OC)/1600/1333/1066 MHz memory modules