Lol.. I have never used Gigabyte's RAID controller but it looks like "GRAID1" is the name of the RAID set you created. Perhaps it's the default name the controller choose when you created the RAID set. You will need to look at the detail of the RAID set to see which RAID level it's using. Perhaps if you click on "GRAID1", additional information will be displayed under "Raid Information" section?
Based on the volume size reported in Windows, I'm pretty certain "GRAID1" is a RAID-0 set. You can also try re-name the RAID set so you don't confuse yourself in the future.
You are right about the Name, it is in a Raid-0 as-well.
But, i think he is talking about not getting the write performance.
Try running http://crystalmark.info/software/CrystalDiskMark/index-e.html
Tell us the the speeds and we'll see what we can do...