SSD stuck at SATA 3GB/s

So my computer has been running fine for the longest time, no problems, and my friend bought an SSD decided to test it to see what speeds he was getting.
I decided to test mine to give him something to compare his to, and noticed I was only getting 280mb/s read speeds. I should be getting over 500mb/s

Checked the intel Rapid storage tool and its reporting my SSD as SATA2 3GB/s
I've check the bios and installed the latest drivers, and I cant figure out why it's stuck in SATA2 mode.
My motherboard is an ASRock Z97 Extreme4

Are you sure it's plugged into one of the native intel Sata 3 ports (6Gbps)?

Yes. *All 8 ports are 6gb/s. *It's plugged into an Intel port.

Unlikely, but tried another cable?

What make/model is the SSD?

Samsung 840 EVO

I've not tried another data cable but the one I'm using is a 6gb/s one bought from ocuk...

check the Samsung magician software, it states what port its connected too.

is achi enabled on the sata ports as well? the above software will also state if achi is enabled or not

Yes all this has been checked in the bios.

Hmm... It looks like I can't get the full 6gb/s speed because I have my SATA ports configured for RAID (I use 2 velociraptors in RAID0)

That sucks big time. Looks like I'll have to replace them with a single drive. I'll try and pick up a 3TB drive somewhere.

Replace the Raptors, enjoy the silence