Aside from things like... dual power supplies, vs. single... is server hardware actually more reliable than power desktop hardware? Does ECC make a difference? Is there failover between two processors on dual processor servers? Is server hardware less likely to fail in the first place? Do high end SCSI drives fail much less often than SATA drives? Do high end server oriented gigabit ethernet cards fail less often than cheap PC cards? Are server motherboards more reliable than desktop boards? And is there any hard data on any of this? Conjecture? I don't have enough experience with supporting hardware to really know. Its just a whole hell of alot cheaper to buy a single/dual proc desktop board, and put some extra drives in it to make it a server than it is to buy a low-end 'server' from a vendor. I'm wonder what the difference actually amounts to.