Originally Posted by
fragamemnon
On an SSD-unrelated note:
Yes, a mechanical RAID will offer a noticeable reduction in loading times.
Also, when assets need to be cached, that will be done in a quicker manner, too. For example, you are probably aware of the stuttering that occurs every Diablo III first run.
Also, in games like CS:GO it can be handy in games such as Casual matches where the early birds pick their teams, but not for competitive play.
I have no experience with CoD/BF, but you will see less loading screens, unless the client doesn't let you in the game until everyone has finished loading.
Moreover, if you have a third, spare HDD, there are tools that will help you migrate your data so that you can build the array and bring everything back. My Windows installation survived through a Mobo/chipset change, one disk to RAID upgrade, and then a migration onto an SSD.