2MB/8MB and 32MB SIMM's are what are know as "dual density" SIMM's. They are really two 1MB/4MB/16MB banks mounted on one SIMM PCB. In order to utilize "dual density" SIMM's the memory controller MUST support dual RAS(Row Address Select) and dual CAS(Column Address Select) functions. Many memory controllers DO not support dual RAS/CAS strobing. In this case the SIMM MAY be recognized as 4MB or not recognized at all.
If your MB manual doesn't list 2MB/8MB/32MB memory SIMM's in the memory matrix chart then it probably doesn't support "dual density" SIMM's. General rule of thumb is that "dual density" SIMM's will have components mounted on both sides of the SIMM PCB.
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