Marvel controller on Asus P8z68-v pro gen3 wont set 6gb/s

[Conditioned]

So I enabled this controller in the biosrecently , enabled the eprom. Have a 6gb cable attached and a ssd. Why does it set to 3gb/s? It says so during boot and I checked it in windows with crystal disk info. Windows 7 seems to detect it and I can read/write from it. I however suspect something with the bios since when the device is loaded pre-bios its already stating its @ 3Gb/s. At first I let windows load drivers from it from windows update, then I also tried installing the driver from asus website but that just seemed to decrase the performance even more, if Crystaldiskmark would be considered reliable which I consider it should.

 

[Dwarf]

What is the make and model number of the SSD ?

What colour SATA ports are you using? The Marvell ports are navy blue.

 

[Conditioned]

Actually seems the disk im using doesnt support 6bg, thats why. :/ Sorry for posting and please ignore/delete this.

 

[Dwarf]

That would explain it. The data transfer over any interface is only going to be as fast as the slowest device connected to it (including the interface itself). So, if a 3GB/s device is connected to a 6GB/s interface, it will run at 3GB/s maximum. Likewise, if a 6GB/s device is connected to a 3GB/s interface, it too will only run at 3GB/s, as that is the slowest in the chain.