It says right there 2000Mhz Hyperstransport. All socket 939 boards have allowed for 2000MHz HT speeds.
If you remember, the HT bus is doubled so on nF4 its 1000Mhz X 2 = 2000Mhz.
On Athlon 64s you adjust the FSB and then the multiplier (so in the BIOS you could go with whatever and then have it have a 5X multiplier), but its also doubled as the HT has two lanes that have the full 1000Mhz bandwidth (one with data going towards and the other with data going away from).
Ugh, that board's layout is hideous. I don't see how it'd run cooler if you have cables covering the CPU's HSF. If BTX boards follow that layout then its not going to be any better for cooling than current ATX boards. In fact if companies would just flip the board upside down like Lian-Li does on their PC-1000V cases then a board like the DFI nF4 boards would do the same thing, only with a much better board layout.