I made a fresh Win8 install on HP Pavilion DV7 (not upgrade), it has integrated Realtek gigabit NIC (RTL8168).
After a lot of investigation I think I found the real culprint of my memory leaks. I booted up machine in "safe mode with networking" - and suddenly memory leak has gone
So I made a list of loaded network drivers (using DriverView from NirSoft) and compared it with the list of drivers in normal boot. Safe mode did not load the following kernel drivers: lltdio.sys, mslldp.sys, Ndu.sys, rspndr.sys, srv.sys, srv2.sys, srvnet.sys, wanarp.sys.
After disabling Ndu.sys (Windows Network Data Usage Monitoring Driver) with Autoruns and normal boot - voila no more memory leaks!!!!
Ndu driver was introduced with Win8 (http://batcmd.com/wi...8/services/ndu/
) and is actually quite buggy in combination with Realtek NIC. Microsoft should fix that...let's hope soon.