I have a Lenovo Thinkcentre M58 with 8.00GB of DDR3 RAM inserted. My motherboard thinks it's DDR2 (Why?), and so does Windows, but I have only 7.46GB available. 549MB are hardware reserved. I remember when I reset the BIOS, the memory available went up to 7.48. Not much. I want to be able to use most of the RAM. Any help appreciated!