My first real home server, a Dell PowerEdge T310. A church offered it to me and I couldn't pass it up. I'll be running Ubuntu server and using it as a Plex
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Dell PowerEdge T310 CPU Heatsink D382M 0D382M | eBay
8GB Memory for Dell PowerEdge T310 (Xeon CPU) Quad Rank ECC Registered DIMM (PARTS-QUICK Brand) at Amazon.com
Dell PowerEdge T310 | Cheap Servers | Aventis Systems