EVGA GeForce GTX 680+ (4GB, with Backplate)
P/N: 04G-P4-2686-KR

Firmware:
You can choose if you want to have it with the standard firmware (v80.04.47.00.80) or
flashed with a Mac-compatible firmware (v80.04.87.00.09) providing a Mac boot screen.
(This GPU is Metal compatible and in macOS the DVI, HDMI and DisplayPort are working.)

Specifications:
Bus Type: PCIe 3.0
Memory: 4096MB (GDDR5)
Base Clock: 1019 MHz
Boost Clock: 1084 MHz
CUDA Cores: 1536
Outputs: 1x HDMI, 1x DisplayPort, 2x DVI
Power Input: 8pin + 6pin (PCIe power connector)

PassMark Performance Test scores:
2D Graphics Tests: 595
3D Graphics Tests: 5858

More information here:
https://www.evga.com/Products/Specs/GPU.aspx?pn=11c142ec-09fb-40ae-aa9a-bf3945681c4