Nvidia IBM Quadro K4000 3GB PCIe 2 x16 Graphics Card GPU 03T8312 [K4000 IBM 03T8312] - $682.50 : Professional Multi Monitor Workstations, Graphics Card Experts
Refurbished: IBM Nvidia Quadro K4000 Graphics Card 3GB GDDR5 Memory PCIe 2.0x16 192-Bit Full Height Bracket, 03T8312 - Newegg.com
Amazon.com: Epic IT Service – Quadro K4000 with Two DP Ports, one DVI Port, and Supports Three Monitors, 4K Resolution via DP or HDMI (1 Year Warranty) : Electronics
713381-001 - New Other - HP NVIDIA QUADRO K4000 GRAPHICS CARD 3GB 768 CUDA CORES MEMORY INTERFACE 192 BIT GDDR5 MEMORY BANDWIDTH 134.0GB/S PCI-E 2.0 X16 ( 1 ) ONE DUAL LINK