This is my hp dc7800 hackintosh. I used my hack usb to install it and only had to install three kexts for everything but sound to work After putting in my 50$ nvidia 8400 gs 512mb my sound didnt seem to work so i did a fresh install without voodoohda and without applehdadisbler kext. i ended up buying a syba usb audio output device that was 6$ off ebay and bam, everything was perfect. let me know if you guys want a tutorial or any help in building one.
HP DC7800 Hackintosh 10.8.2