As it turns out, when hp put out the bios update for this board, it allowed for the 45nm cpu's, but they reverted it and put out a new update that didnt allow it. So even if i do update the BIOS, I'm still stuck with the 65nm ones.
However, i did notice something. The mobo page says "Core 2 Duo E4x00 up to E4400", but the board comes stock with a E4500 cpu. If i can find a higher cpu for cheap, ill give it a test. But ill stick with the 6k series cpu for now.
The highest Core 2 Duo E4x00 series IS the E4500. You can't go any higher than that.
Your best bet will be a Core 2 Quad Q6xx0 series or Core 2 Duo E6xx0 series which are both 65nm processors.