Thanks for the answers!!!
I was using this machine with 64MB and like elianda said, I did get into some trouble , IIRC Realms of Arkania 2 needed 32MB or less to actually work. For that purpose I am using a ramdisk program to eat up either xms or ems and then unload it with a simple .bat file 😀
As for the speed in 64/128MB configuration, I did made memory benchmarks using Sandra 2001 in win98se . My mobo is MVP3 based btw.
Speeds where the same (just a couple mb/s difference depending on the module(s) used, IIRC ~78mb/s and ~110mb/s using the fpu) but what it did made a difference was enabling bank interleave (with a value of 2 or 4) that becnhed ~87mb/s and ~135 with the fpu (or is it mmx read?) . Again using 1x64 or 2x64MB dimms made no real difference in the benchmark.
edit:
@Markk : yep win98se is running OK with 64MB until you open an IE6 window to download a patch or a driver... then is is "welcome to slow swap city" ... 128MB really did made a difference. And I am not using a pimped system with a gazillion apps running, only drivers installed, IE6sp1 and the unofficial SP. ....now if only win98se wasn't such a crashfest on my system 😵 I am always getting those recoverable messages about explorer or ie...