You can get the information you require just by google the name of the GPU you have. It is a simple procedure, but i will help you and here are the info i found:
ASUS A387C2
Rev 1.00a
PN : 08-170076810
EAX700-X/TD/128M/A
It is a very old and very bad graphic card
So, it has 128MB, but what does the rest mean?