Hi Steve,
I have a Dell (32 bit) Pentium (Intel) Dimension Desktop E520.
According to the website: wwwgtopala.com this is what I have:
Memory type: DDR2 SDRAM
Speed DDR2-666 (333 MHz)
There are 4 memory slots and I am using two slots currently.
Both slots are using 1024 MBytes for a total of 2048 MBytes
The capacity is 4096 MBytes so I have 2 more max at 1024 MBytes
that I can install on this computer.
Appreciate your help.
Thanks

Mele