C6 / C7 States only apply when the PC is under sleep / hibernation / standby states. So no.
yeah i know that, but this
for instance analyzes the impact of enabling them on a 4770k system and seems to observe a noticeable difference:
"We found that with C6/C7 disabled that the system would idle between 23.7 and 24.1 Watts, but with them enabled we were seeing between 20.5 to 21.2 Watts."
wondering how that applies to my system.