If you're like me, you just assume your SATA 3.0 Gb/ s drive should be that fast right out of the gate.
HOWEVER, this is wrong. My coworker TJ pointed this out to me.

See the jumper? Yeah, you need to remove that. Since I got my drive OEM, I didn't know this since it didn't come with any paper work.
The reason why they do this is for people that don't have a SATA 3.0 Gb/s motherboard. I figure a lot less people notice the lack of speed than a hard computer error on bootup.
When my RMA'ed RAM comes back, I'll verify this, plug in my 2nd DVD drive, and go all the way to an even faster computer.