Here for sale is an nVidia GTX780 3GB Graphics Card that has been flashed with the latest firmware and is compatible in models of Mac Pro from 2008-2012.

These cards display full EFI boot screens allowing changing of the boot drive if needed:

Supports 4K with OSX El Capitan 10.11 using the displayport.

Complete with the card you'll get the necessary 6 and 8 pin power cables that plug into the Mac's Logic Board to provide power.

These are awesome cards for the Mac Pro and also work very well in BootCamp :)

I will ship this well packaged via courier for free if you are UK Mainland based!

Features:

Four high-resolution video outputs with boot screen support.

Ports: DVI-I, DVI-D, 1x HDMI, 1x DisplayPort

4096x2160 maximum digital resolution via DisplayPort @ 60Hz.

CUDA Compute 3.0 / OpenCL 1.2 / OpenGL 4.1

2304 CUDA/OpenCL Cores

3GB of 384-bit GDDR5 memory

PCIe Link Speed 5GT/s

The card will work straight away if you are using OSX 10.8.3 onwards but if not you'll have to grab the drivers which are located on nVidia's website here:

http://www.geforce.co.uk/drivers

Simply select the GTX700 series - GTX780 - then you'll see a list of OSX versions to get the latest driver for.