Used, Tested, and Working! Tested with Unigine Superposition Benchmark and runs well with consistent performance.

$140 each, $255 for both.  

Base Clock: 1247 MHz
Boost Clock: 1546 MHz
Memory Size: 8 GB
Bus Interface: PCIe 3.0 x16
Power Connectors: 2x 8-pin
Outputs: 1x HDMI 2.0b, 3x DisplayPort 1.4a
550 Watt or greater power supply recommended.