No it will not help your games run faster. That's CPU/Graphics Card/Memory, etc.
But it would make your games load faster. But that would hardly justify the expense and the potential for memory loss if your Raid 0 stripe went wrong.
However, if you want video capture, DVD ripping, and other hard drive intensive tasks (bittorrent starts up and checks files fast!) then think about it. Its certainly very fast and two SATAs in RAID 0 will be nice.
If you have important data you could always RAID 1 which is mirror, which is what I do with my important stuff. But then you only get the size of one disk and its partner is effectly lost.
Really, I think the main benefit for you would be speed for the above multimedia things I mentioned.