SATA3 (6 GB) will never use it's bandwidth with single disks. There is no advantage over regular SATA connectors. It is mostly marketing hype.
Thank you for your response.
So does it matter which connectors I use for my drives... should I use all of the regular SATA connectors?
Upon further reading maybe this is what I should do:
1 system drive
3 media drives raid 0
2 extra storage drives including page files/scratch/temp
This would use all 6 of my regular SATA connectors.
Does this make sense?
Pagefile and media cache should be on your fastest drive, which is the raid0. Media can be stored on the raid if you have a good backup. Chances of losing all your data are double over a single disk so be careful were you put your media. If you were to go for a raid0, I would put these two disks on the 6 GB SATA connectors, because in a raid0 you may have some benefit form the faster SATA connectors.