You have the Acer/AOpen Vi15g right?
Each 72pin SIMM slot on that board is an entire bank, so it's not necessary to install SIMMs in pairs.
Regarding the amount of memory, either 16 or 32 MB will be fine if you are running MS-DOS games and applications. Assuming you have 256KB of cache, 32MB should be the max cacheable RAM in Write-Back mode.
Yes that board. I think it has the cache not sure how much. I have attached a picture of the board. I will be switching that CPU, I have several options for that. I have an AMD DX4-100. Will that work on that board? If I have the cache would 32MB be the best option?
I can't see clearly, but does your board's SIMM sockets also have gold colored connectors instead of the usual silver-colored ones?
Afaik, the VI15G is the only board I have that actually has gold-colored SIMM sockets.
Btw, afaik my board won't accept 3.3v CPUs either, only 5v. I think it has to do with some voltage regulator missing on older revisions.
What I do like about this board is VLB and coin cell battery in one 😁
The inversed Molex connector near your CPU socket was for a fan I think (could be considered one of the earliest implementations of the now standard CPU HSF connector 😜).