The DS3 allows you to set 6 7 and 8 as multiplier for the 6400. I am using a Arctic Cooling Freezer 7 Pro for the HS with AS5. There is no FSB wall, I can easily hit 450 by dropping the multiplier. Chipset voltage will not let me go any higher, only VCore. My CPU temp never tops 40-43C.
And I deff don't feel bad about it LOL, it is still insanely fast. I went from a Athlon 64 3200+ and Nvidia 6800GT to this with a X1900 XT. Went ATI cause get good accomodations, paid $250ish for that card.
Someone brought up the BIOS thing, I dont think BIOS will help since it really seems to be a CPU limit, it's not a memory limit or FSB limit. But I am using the beta F4C BIOS and it helps other things, like if I had my keyboard plugged into USB and had my PCI IDE card plugged in I couldnt get into the BIOS, they fixed that. Thankfully to I was tired of pulling out my IDE card to go into the BIOS everytime LOL.