Also, is there any real-world difference between the X4500 IGP and the X4500HD IGP, for a linux user?

For about $35 more, I could get the Intel DG45ID motherboard. It has a higher TDP rating, and the G45 chipset, which includes the X4500HD. If this would improve the acceleration of my 3D desktop environment, or make video playback any smoother, I think the $35 extra would be worthwhile. There seems to be little information out there comparing the two...