Sorry if there are other tests that show otherwise. The tests that made my mind up when I purchased my AMD64 was done by NASA. I tend to trust that.
As to hard drive striping.... When you stripe a hard drive in a raid 0 configuration it takes 2 hard drives and treats them as 1. In this config to 120 gig drives would be recognized by windows as 1 240 gig drive. The problem is that when it writes data, it physically writes data split between the two drives. In order for this to work it reserves a small portion of the master drivefor a sort of table of contents so the CPU knows where all the files are and can access them. What you end up with are files that are partly on one drive, and partly on the other. In principle there is nothing wrong with this at all. In reality, you are always one drive crash away from losing every file on BOTH drives. If the master drive of the two goes bad, then there is a good chance that no files on either drive can be recovered without considerable expense. Not only that, but if you do manage to recover files after that TOC goes bad they will all be renamed in a random fashion. Try putting those back together. A mirror is a different story. It writes all data to both drives exactly the same. This means windows see's 2 120 gig drives as a single drive. This is nice because if one drive goes down, the other drive already has the exact same data. You can even run off that single drive until you repair or replace the bad drive, and it will even warn you when one drive goes down. This way you always have a backup. Not only that, but for typical audio applications, a striped drive does not really increase your capabilities in any noticable or usable way. It does however greatly increase the chance of losing a lot of data. I understand that a hard drive can go bad whether it be in a raid array or not. That risk is always there and certainly sucks if you have not backed up important stuff. We all hate it if our "f" drive goes down. However, how much more pissed would you be if when your "f" drive went down you also lost your "g" drive data just because a differnt drive went down?