Doods, maybe, a lot of the BH-6 boards were picky about their memory slots. Read that as a bad design on the board.
On my BH-6 I can't put memory into the first slot and have it work reliably. It does work with a 128 meg stick in the second and third slots. I have read of other people's boards not working with memory in the third slot. The only way to find out is to try it.
Right now I have 128meg sticks in both the second and third slots and it is working.
There are also differences in the way memory is organized. I don't think some high density memories will work with the BX chipset. I havn't checked into that so perhaps someone with more knowledge can clarify?