Running Windows 7 Home Premium, 64-bit. Had 8Gb RAM, noticed that 4Gb were hardware reserved. Bought 16Gb of RAM and installed it (new chips, 4x4Gb). Now I see 16Gb recognized and 8Gb hardware reserved. Looked under MSConfig -> Boot -> Advanced -> Maximum memory is not checked. What is happening? Why does the system always reserve half the RAM for the hardware?