The short answer to your question is Yes, it is possible to create a system without "bridge chip" like QM77. You might want to read the following blog that describes such an application.
This blog is about Intel® Atom™ implementing all of the I-O via PCI Express, but the same concept can be applied to Intel® Core™. You will note this blog describes a system with "limited" I-O needs in an embedded application. However, you say that you want to create a "normal PC". Please consider below the functions provided by QM77. The chipset provides many of the I-O functions needed in a "normal PC", including video display, audio, SATA, LAN, USB, etc. If your design does not include the chipset, how will you provide these functions? Can you make a custom chip (or FPGA) and implement the same functions at less power than the QM77 ?
I hope this helps
J. Felix McNulty
Community Moderator (Intel contractor)