Entering this string a little late, but my $.02 is that many older pc's required 72 pin simm's to be matched pairs - you could mix 2 - 8 mb chips with 2 - 32's, etc. but 1 8 and 1 - 32 would not work. I'm a little surprised that the AST seems to require 4 of the same - did you ever try a mix of pairs? Mark Rode wrote: > >I've never heard of any issues about size mixing. I've never read a user > >manual that says use only certain sizes together. It would be a surprise if > >your system has a problem with this mixture, unless it doesn't support a 256 > >Mb DIMM. > > Well you have now. I own a AST 486DX33 Advantage Pro that requires that all > simms be the same. There are four simms slots and you can only use 72pin no > parity simms configured at four 4s, four 8s, four 16s, or four 32s. You > can't mix a 8 with a 16. I also have a one year old EPOX super seven board > with three SDRAM DIMM slots that maxes out at 3 X 128 meg SDRAM DIMMs for a > total of 384 megs. It won't accept a 256 meg SDRAM. I have tried it. > > Rode > The NOSPIN Group PCBUILD's List Owners: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]>