Note that Intel So7 chipsets are limited in how much RAM they can cache. If you want to use >64MB, don't go for an i430VX or TX, and i430HX will only do so if you have a second tag RAM (not common in desktop boards). No L2 caching of everything above 64MB means subpar performance, particularly in DOS or Win9x (as they fill RAM from top down, unlike WinNT/2K and Linux which do bottom-up).
Now, in 1997 mortal humans didn't have >64MB, so a non-issue with a period-correct build, but if you do want >64MB, you either need to look very carefully for a suitable i430HX board, or need to go non-Intel. With Via chipsets, the amount of cache determines what can be cached, 1MB of L2 cache allows 128MB in Write-back mode and 256 in Write-through . If you want more than that, you need 2MB - but I wouldn't recommend such a 'far out' build if you're still at the phase of asking these basic questions.