It was updated by Intel on 03/23/2010, so it's newer than the one included with Windows 7.
The biggest part of the update was the support of TRIM for SSD, which are not part of a RAID array. That's a whole other topic!
Even though you don't have a SSD, I'd still download and install the driver. You should always try to get the latest drivers for all components.
You could run benchmarks on the drives before and after to see if you got anything extra with the new drivers. I downloaded/ran "HDTune,"
but it's only free for 15 days.