I was given this HP Proliant DL180 G6 (Xeon E5506, 4GB RAM) without power supply. As a newbie in that domain, I was shocked by the size and weight of that thing!
HP ProLiant DL180 G6 review
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HP Proliant DL180 G6 1x Xeon E5520 4-Core 2 26GHz 24GB RAID 2U Server