For the voltage of the BH-5, I have seen lots of systems that ran at 2.8v at stock
settings, anything else needs more voltage, I totally agree. I said it depends on how you run it also. BH-5 does love the voltage, but you don't noramally need 3.2 at 400MHz 2-2-2-5, it just causes unnecessary heat out put but you may need more voltage, it tends to vary from system to system (undervolting/overvolting). Sorry if I caused some disagreement, run what works for you.
For the 1T/2T its just the command rate, I am not familliar with the NF4 bioses, as I have a NF3 system. But there is a setting to run the ram at 2T. This is to increases stability not decrease it. With the new AMD cores, you can run your ram at 400MHz 2T command rate, if you run 1T you will have to run you ram at 333MHz to maintain stability. On the new DFI board RDX200 can run 4 sticks at 400MHz 1T, but it doesn't seem work perfectly yet.
Maybe it it might be a wise idea to go to the DFI Forums
as they work with DFI boards.