Guys, remember this chipset (X38) was not originally intended for 1600 mem freq, only X48. Since both BoneTrails, DX38B and DX48BT2, share the same BIOS this was some sort of inheritance for our board, Intel would probably say the X38 doesn't support 1600 anyway.
Still, I believe some people run this 400x1600 ratio fine, it could be your particular board, or maybe your mem, this board is picky. Probably not.
Just another one of those things that make this board so particular.
There was way back some discussion regarding the different ratios I believe.