63tb,
I use that MB in one of my older systems...
You didn't say how much SDRAM is currently installed, which size module(s) you have installed, or which OS you are using.
Win98 will only support 512MB SDRAM reliably on that MB, so if you want more SDRAM you'll need Win2K or WinXP.
Since you are already using PC2100 SDRAM, and PC2100 is the fastest SDRAM supported by that MB, that's what you'll want to add.
Please note that you only have 3 SDRAM slots to work with, and 512MB is the maximum size supported in each slot.
so...
512MB x 3 slots = 1.5GB Max (w/Win2K or WinXP)
In my experience with this MB, the biggest bottleneck to good AH2 performance is the AGP 4x slot. An upgrade to a new AGP 8x MB and AGP 8x video card will do wonders for your AH2 gaming experience.
Good luck and good flying!
CptA