My Samsung 830 was scoring 5.9 until I updated the ahci driver. My motherboard is amd & I was using msachi. When I upgraded to amdsata, from gigabyte motherboard website, the score went to 7.9 & the boot time is now supersonic.
Yes I installed 7 on the ssd. I only have that ssd. I am running 7 and I checked an saw it was already in achi mode. I am not running sp1 though.
I had a higher wei score for my ssd on my previous installation of windows 7 as well. After reinstalling the same OS it was significantly lower. But then I activated windows and installed service pack 1 and all recommended updates and did a new WEI assessment and now my score is 7.6 for the ssd, wich is even higher than on my previous installation.
Go to start, type regedit in the start search window, and then press enter.
If you get the UAC warning dialog box, click continue.
Locate and then click one of the following registry subkeys:
In the right pane, right-click Start in the Name column, and then click Modify.
In the Value data box, type 0, and then click OK.
On the File menu, click Exit to close Registry Editor.
reboot your computer for changes to take affect