I think it depends on the size of the drive also
scores look ok,only way is to back it up and secure erase it and align it to 4096mb restore your backup
What fw version on the 120gb m4? It should be around 200mb on the writes
use it as a caching drive for your hdd
just do the reg tweak to let you install the raid drivers(actually gigabyte has its own software to enable caching without reinstalling)
itll be a lot quicker than just your hdd