Hitachi HDS723020BLA642 2TB 64MB Cache

I just bought 2 of these HDS723020BLA642 2TB 64MB Cache drives since they had the same number at fry's as my other two HDS722020ALA330 drives. Of course I just found out they're a newer version or not exactly the same in terms of numbers. In any case, I figured readynas has been slow and probably will never update their compatibility lists so I just went ahead with these instead of the 3 Terabyte drives since the first two have been working fine an now I see them on the list. I also thought I saw something about no support for the 3 terabyte drives on the NV+. Not sure about the 3 terabyte support, but I got one question? Do I need a jumper on the two pins to bring it down to 3GB/s? There's nothing in the box or sheet of paper that Hitachi includes. They normally tell you this, but I don't want to mess it up if they changed this. I read something about people doing this with software which makes no sense since they all have the pins, but I just want to make sure this is correct. Has anyone seen this information. I can't find it anywhere on the Hitachi site for these models. Also, they use a different number on the site than what's on the drive box so it's nice and confusing just finding the correct drive, at least for me anyway. Any help is appreciated. I haven't looked at this stuff since I set up my other drives and now I'm back trying to make it bigger since it's been nagging me that it's almost full for the last year or more. thanks.

Just a side note in case anyone is looking, fry's has the 3 terabyte drives for $109, but since I can't tell if they would work on this I'll just stick with the 2 since I already have two of them. This should keep me going until the others really come down even more.