Originally Posted by ae804
Well, here's the deal:
You'll get ~175% the performance over a single drive. You'll have 2X the chance that a drive fails, and if that happens, then you won't be able to rebuild your drive.
The safest and best performing array is a Raid10 (or Raid 1+0) Array. This will give you backup safety, and speed, but it requires 4 drives instead of just 2.
It actually depends on the sata raid card. Assuming the OP is intend to use the intergraded sata card such as ICH9R or NF570MCP, you probably see a maximum 50% increase in benchmark and average 10% increase in applications.
Yes, the chance of error doubles in a RAID 0 setup. But I think it can be safely neglected in home computer. Honestly, the chance of a hard drive failure is a million to one. When you are running in a RAID 0, the chance become a million to two. The problem is it can be very difficult for the data recovery work when this happen (RAID 0).