Hopefully nodevice.com is trustworthy. I am generally untrusting of driver utilities and sites whose drivers are often "value"-added versions. Use this one directly from Dell:
http://ftp.dell.com/FOLDER00460008M/1/SAS-RAID_Driver_X33F8_WN32_5.1.118.32_A01.EXE
Otherwise, how can you account for the fact that nodriver's download is nearly 3 times bigger than Dell's?