I have an Intel D865GBF MB with 2 256mg of memory and 4 slots.
With XP the system uses 88% of the memory. I have a 1gig chip to update the memory.
Do I just install the 1 gig. Do I also install the 2x256 ( all 3200, 400)?
a0 a1 b0 b1 My guess is a0 1 gig a1 256mg b0 empty and b1 256mg
At the cost of a 1GB module, I'd get another identical module and go with dual channel. What bc4 shows is a configuration where 1GB (2 x 512MB) is dual channel and the rest (1GB) isn't. So I'd go with 4 sticks.