Ram After Upgrade

Need help here please,

I have just finished upgrading the memory of a desktop pc to 1GB from 512MB. I bought two 512MB for it and after fixing it I checked the memory installed through properties, it was shown as 957MB, not 1024MB.
The Video RAM is just 32MB.
where did the remaining go to?

adding to wht oyb said, part of ur RAM is used as shared memory, a very small percentage of it anyway.

"In computing, shared memory is a memory that may be simultaneously accessed by multiple programs with an intent to provide communication among them. Depending on context, programs may run on the same physical processor or on separate ones. Using memory for communication inside a single program, for example among its multiple threads, is generally not referred to as shared memory." - Wikipedia