For sale here is a superb Sapphire Radeon R9 280X Dual-X OC version 3GB graphics card, flashed with Mac EFI to display Apple boot screens in the original Mac Pro tower.
This card is suitable for both EFI32 and EFI64, and therefore will work in the Mac Pro 1,1 through to 5,1 (2006 - 2012)
It will work with macOS 10.9 Mavericks through Mojave to macOS12 Monterey, as it is Metal supported. It will also boot Windows 7 and 10.
It will display Mac EFI boot drive selection using the Alt key, and the Apple logo with boot progress bar on screen. It will also allow access to Safe boot mode and Recovery mode.
This Sapphire Radeon R9 280X Dual-X OC version 3GB Graphics card is the factory overclock (OC) version, with an impressive 1020 MHz Boost clock, with 1500 MHz memory clock, and 2048 Shading units.
Ports: 1 x Dual-link DVI; 1 x Single-link DVI; 1 x HDMI; 1 x Displayport, all of which output in Windows. Note that, because of EFI port mapping, macOS will not output on Single-link DVI on the flashed BIOS. This card has been successfully tested simultaneously driving 4 displays one of which was 4k @ 60Hz out of mDP.
Full specs are available here:
https://www.techpowerup.com/gpu-specs/sapphire-dual-x-r9-280x-oc.b2463
These are fantastic cards for gaming, editing or high-end 3D design work, with superb cooling via two very quiet fans and efficient heatsink.
Please note: this GPU should be installed in a x16 PCI slot, and requires auxiliary PCIe cable power supplied via its 1 x 6-pin and 1 x 8-pin connector. The cable type will of course depend on whether your system is PC or Mac.
The card itself is in superb cosmetic condition, very clean throughout, thoroughly tested and is working perfectly.
Please carefully check suitability with your system. I am happy to answer any questions, but please do ask BEFORE purchase.
Strictly with prior agreement, I may be willing to ship outside of the UK to certain destinations. Prospective buyers must check and accept actual shipping costs BEFORE you purchase and accept responsibility for all import duties and taxes to their chosen destination.
Payment via PayPal or eBay payment options only please. Thank you.