Ahh yes sorry its been a while since I last used caching,you have to re install windows to enable raid,but there's a simple reg tweak to get round it,ill post it up in a mo as I'm on my phone
ok here's the guide I used and it works a treat,note you'll need to download the raid driver off asus website ready to install once you've applied the reg tweak
If you already have W7 installed and do not want to reinstall do this:
1) Do not connect the caching SSD yet. First apply the following registry tweak:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\Iastorv
In the details pane, right-click "Start", and then click modify.
In the Value data box, type 0
This registry change enables the RAID driver in Windows.
2) Next install the raid driver.
3) Connect your caching SSD
4) Set up caching with RST util.
http://www.xtremesystems.org/forums...y-step-guide-to-setting-up-SSD-caching-on-Z68