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!
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More abouthardware reserved memory issue
I'm going to guess that you have onboard video card and the ram is being used as video ram. The 'How much ram to assign to the video card' setting is often available in the bios. It sounds like yours is set to 512MB.