Have I the wrong machine, or is this it?http://www.recycledgoods.com/product/38323_gateway_mfatxnin-nmz-300s_pentium-4-1.80-ghz,-256-mb-40gb
Not to be crass, but this baby would sell for about $50 around here.
Two Ram Memory slots.
Uses DDR Sdram ram memory. 184 gold plated contact pins. 92 on each side.
One Locating Notch.http://en.wikipedia.org/wiki/File:Generic_DDR_Memory_%28Xytram%29.jpg
One place states DDR Sdram at 266MegaHertz.
The other states DDR Sdram at 333MHz.
Makes me think it will support PC2100, and PC2700.
(But don't mix them)
TOTAL maximum amount for motherboard seems to be 512MegaByte.
That would be two 256MB sticks.
Seems there is also a model that uses SDR Sdram. (Just known as Sdram, usually. And that is erroneous)
Uses PC133 (SDR Sdram at 133MHz)
Either way though, the total maximum amount is 512MB.
Talk about a hard computer to look up specs on! Lol!
You get this thing running, post back in a Comment.
I would like you to download a tiny program called CPU-Z.
With it we'll find out what the motherboard chipset is; specifically the Northbridge chip, and see what the total max ram memory support, really is.http://www.cpuid.com/softwares/cpu-z.html
(Free, NO junk attached)
I can guide you in downloading, installing, and using.
I'm just going to guess, but I'll bet it's an Intel motherboard, and uses an Intel 845GE chipset. (Motherboard chipset)http://en.wikipedia.org/wiki/List_of_Intel_chipsets#Pentium_4_chipsets
The Northbridge chip being an Intel part number -
Intel 82845GE, (Hidden under an aluminum Heatsink),
and an Intel 82801DB Southbridge chip. (ICH4)http://en.wikipedia.org/wiki/List_of_Intel_chipsets#Southbridge_8xx_chipsets
The Southbridge chip is probably exposed, with no Heatsink sitting on it.http://en.wikipedia.org/wiki/File:Motherboard_diagram.svghttp://en.wikipedia.org/wiki/Northbridge_%28computing%29http://en.wikipedia.org/wiki/Southbridge_%28computing%29
For additional questions please post in a Comment.