Had to give up on this. Using modified next resulted in HD3000 to be very unstable. I was also able to force the resolution I wanted using Graphics Mode setting at boot, but then I was welcomed to the screen by a massive amount of noise on the screen. After reading all the posts with regards to artifacts showing up with HD 3000, I decided to unjust my old NVIDIA GeForce 8600GT. Using NvEnabler64, this thing worked like a charm on the first try.
I'll be trying to get a DSDT file for GA-H61N-USB3 on bios version F7, I will try HD3000 again at that time. I was hoping not to use a video card as I don't do gaming and preferred to use my only PCI-e slot to put a SATA card to get 6Gb/s out of my hard drive and not settle for 3 Gb/s that this board just gives.