There is suppose to be a "secret" feature in Windows 8 Power Management scheme called "Memory Power Management", this new section introduced in Windows 8 allows you to change a lot of advanced settings related to memory.
It can be accessed by the "WIN+R" key combination and typing in...
change plan settings
configuration
control panel
desktop features
hidden features
memory features
memory management
power management
power options
powercfg.cpl
security
settings
tech discussion
troubleshooting
user experience
user interface
win+r
windows 8
windows features