From the Elite website: "Please check the revision of your motherboard found stamped on your motherboard next to the model of your board."
See if you can find a PCB revision or version number.
The online manual has the revision number on the first page (preface-copyright). If you have a manual, check it.
If not, try downloading AIDA32 to see if it gives you better info.
512MB is quite a lot of memory. Usually that's enough. Are you using applications which require huge amounts of memory like video editing?