680i and 780i both are not 45nm Quad-core Ready!!!

Ummmm doesnt matter about the chipset, its the vrm that counts - the 865 chipset was "supposed" to be for Northwood P4's (in other words, in its day) but ASUS's P5PE-VM will run the E6700 (thanks to the newer socket ofcourse, and the new VRM and bios support) - this is a common misconception (cpu support and chipset).

If the manufacturers bothered they could get an 845D chipset to run a C2D - the chipset supports the QDR FSB required to communicate with the CPU, the rest is the work of the VRM design, socket, and chipset capabilities (eg stuck at FSB400 "officially").