You can buy an old (2 -3 yrs) compaq proliant with two or four P3 processors on ebay for next to nothing. The high speed of the disk system and the design of the motherboards make these systems faster than many new desktop machines and much more reliable. With the RAID disks and redundant power supplies the can withstand the two most common causes of system failure.
They are a bit noisy due to the powerful fans but for business server use they are excellent value.
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