First of all make sure your mother board supports which type of RAM
i.e. SD1 or SD2,

same thing about the two 128 MB stips also, that what type of RAM are
they.. SD1 or SD2

you can ask some friendly neighbourhood computer vendor,

------- the logic is that only supported type of ram should be
installed on the motherboard. --------

(If both of the 128 strips are identical) you can put both of them in
the two slots you have on your motherboard after taking out the
existing 64MB stick.

give it a try, all the best






On Jan 13, 6:58 am, "Charlie East" wrote:
I have a HP pavilion PC model XE783, System says It has 63 meg ram. I want
to install more. Took the side off and looked in, It has one memory stick,
There are two slots. I have come across two sticks @ 128M each. The physical
size are the same as the installed one.How can I tell if they will work in
my system?
Thanks
Charlie