->  WC> The 128 Meg 168 pin DIMM is listed as  Samsung PC100-322-620
->  WC> but no idea if it's ECC, buffered or unbuffered.
->  WC> I think I'll take a chance and grab an unbuffed 128 Meg DIMM
->  WC> and have a go with it.

-> I don't think Gateways are that fussy but you probably will still find that the
-> memory should match each other regardless of size.  Don't quote me on this but
-> it seems to me that the one I played with had an issue with mixing types, but
-> individually they all worked with it.

Looking at Ebay there are plenty of lots of 2-3 and single
DIMMs many pulled from Gateways used-tested, price is right too.

However they don't seem to specify gold or tin contacts.

This Gateway has gold contacts.

I can buy 2-3 sets of this memory from Ebay for the cost
of a local vendor's offering. 
--- Platinum Xpress/Win/WINServer v3.0pr5