Summary: Great servers for the price point. We use these loaded with 64GB of ram running VMWare ESXi on them. Installed with dual 6 core AMD Opterons these things ROCK! Easily can run 20 to 30 VM"s on them and they don't break a sweat.
Summary: I purchased a Dell R515 Server as a replacement for an old PowerEdge 4600. This system works amazing well for a Unit costing under $4000. The dual 6 Core Opterons and and 32 Gigs of RAM I ordered with it are sufficient for several virtual machines. You have multiple choices of hardware for this system, but I went with the Hot-Swappable SATA Drives to make it less expensive.