It's not a single dimm it's 2x 2GB, apparently forgot to copy that part with it

and what you are missing is an AUDIO card, and no onboard audio is just sucky and cheap, if you can spend 1800 on the other parts, the extra 100-200 euro wont be that much.
No it means 200 less to spend on the things that really matter *blink blink blink*
Yes I know you are an audio fanboi and no I really..really..don't care :P