HP Z600
-2x Xeon X5650 2.67Ghz (6c/12t per CPU, 12c/24t total)
-48 GB memory
-Nvidia Quadro GPU
-Dual boot linux mint 17.3 and Win7 Pro 64 (unactivated)
-Configured for multi client on both OS, ready to crunch
-$225+shipping

Dell T5500
-2x Xeon X5675 3.07Ghz (6c/12t per CPU, 12c/24t total)
-48 GB memory
-Nvidia GTX 750 Ti
-Dual boot linux mint 17.3 and Win7 Pro 64 (unactivated)
-Configured for multi client on both OS, ready to crunch
-$275+shipping

PM if interested