Not quite. H67 doesn't have native SATA 6Gb/s ports. Just like the X58 generation, the P67 generation boards used Marvell controllers for SATA 6Gbps ports. These were given a single PCIe 1.0 lane linked off the PCH, and a single lane maxes out at 250MB/s. But there were other issues with the Marvell controller that hurt performance...
H67 and P67 both have 2x native SATA 6Gbps ports. On the H67 board in question
, none of the internal SATA ports run through the Marvell chip, so that can be crossed off the list.
I am wary of messing with BIOS too much because this is actually a Serenity HTPC from Puget Systems that supposedly has some custom fan tuning and other tweaks in the BIOS. Incidentally, I'm sure I overpaid for this stuff but can say between the foam in the case and the extra slow fan speeds, the PC is dead silent.
Ehhh. I'm not really familiar with the brand, but I doubt they did any custom programming in the BIOS. If they did, that would only make me more suspect of the BIOS being the problem. So long as you're sure that's the board you have, I would install the latest BIOS from ASUS. Worst case senario, your fans turn a little faster.