Here for sale is an nVidia GTX680 2GB Graphics Card that has been flashed with the latest firmware and is compatible in models of Mac Pro from 2008-2012.

Supports 4K with OSX Yosemite 10.10 using the displayport.

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

Complete with the card you'll get the necessary 6 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:

NVIDIA GTX 680 MAC
1536 CUDA Cores
1006 MHz Base Clock
1058 MHz Boost Clock
128.8GT/s Texture Fill Rate
Memory

2048 MB, 256 bit GDDR5

6008 MHz (effective)

192.26 GB/s Memory Bandwidth Interface

PCI-E 2.0 16x
DVI-I, DVI-D, HDMI, DisplayPort
Resolution & Refresh

240Hz Max Refresh Rate
Max Analog : 2048x1536
Max Digital : 2560x1600 (Dual Link DVI Only)

Total Power Draw : 195 Watts

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 GTX600 series - GTX680 - then you'll see a list of OSX versions to get the latest driver for.