Hardware Architecture Books

Can you guys suggest some good books on hardware/systems architecture? I know next to nothing about hardware and it would be great to have some solid references on the subject. Mainly I just want to understand some of the finer points in accelerated graphics. There seems to be quite a bit of language underpinning some of the more advanced concepts in optimization, and it leaves me with a blank expression every time :expressionless:

Thank you very much.