Is there any advantage to SATA3 over SATA2 for drives?

[indivision]

I have my data on a set of WD Red drives that are SATA3 capable. But, would there be any performance difference if I used a board that had SATA2 ports for them?

I'm upgrading my motherboard and want to know if there is any benefit to sticking with a board with all SATA3 slots. Many options only have 2 x SATA3 and 4 x SATA2.

 

[Ericloewe]

Not with mechanical HDDs.

What motherboards are you considering?

 

[indivision]

I started by looking at the ones recommended in Cyberjock's hardware thread.

I'm pretty sold on the Supermicro brand based on reading/comments here. But, the recommendations weren't Mini-ITX.

The Asrock C2750D4I recommended looks pretty good and is Mini-ITX. Though, a little more expensive than I was hoping (but doable if necessary to do this right) and it's not Supermicro. :)

Requirements:
Room for 4 drives and an SSD.
Up to at least 32GB ECC RAM.
IPMI
Enough power/CPU to handle heavy home use, occasionally to multiple users. Maybe a back-up running while transcoding streaming is happening or transcoding streaming to two different places.

Don't need a super-powered machine. So, if compromises can be made to save cost such as integrated CPU, I would lean that direction.