Seems to me that this article would have been better had it been to highlight the onboard RAID configurations which most ppl will use on a home system, rather than a professional environment. I'd much rather have seen a comparison on a mainstream motherboard. There are significant differences, starting with the power rail.
Home users should never depend solely upon a RAID array for data or even the OS. A good backup system is priceless. Long live E-SATA! Any professional interested in saving themselves headaches would also have a backup system in place, moreso when using RAID arrays than when not. If/when the failures are added to the mix, it will become clear that RAID is not the most stable system. I can't count the number of times I've had to reinstall my OS or recover my data due to RAID failures and hard drive failures. Although images made it simpler, its still a major inconvenience.
I'm not sure why anyone thinks RAID 5 is the most commonly used form of RAID, as most people can't afford 4 or more hard drives and wouldn't know how to install/configure them. I'd think RAID 0 is the most common, followed by RAID1, and then RAID 5/10.
I sure hope RAID 10 will get a mention.
I've also found that odd numbers of hard drives do not perform as quickly as even numbers of hard drives with onboard RAID controllers. No idea why that is. But having never used a separte RAID controller, maybe its 3rd party RAID controllers that don't have that issue?
I don't see the point of comparing to a single Raptor unless the comparison was to Raptors in various arrays, and the article stated why they didn't use Raptors. I'd think the difference in speed would be the same % for any hard drives used.
Anyway.. another good article and well overdue in my opinion. RAID has never been covered in enough detail by the motherboard manufacturers, and isn't easily googled.