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Actually, after some serious fiddling, I got my 4850 working with Sierra using the iMac 10,1 (late 2009) system definition. I'll write up a guide once I know I can make things work from start to finish using a bog standard UniBeast 7.1.1 Sierra install. Said guide will be very similar to this...

Still on El Capitan. I updated the guide per Fl0r!an's advice to use a HD 4870 PCI device id instead of a HD 4850 PCI device id on Sierra. Maybe try that? :)

Sorry for the late reply (my account got deactivated for some reason). No, I only configured Clover to spoof the PCI device id.

I updated my BIOS to the GA-EP45-DS3R - F11i version and it worked like a charm as long as I set it up to use AHCI and disabled the "Native IDE" option for SATA ports 0-3. Thanks for the tip! Not sure I want to bother with the Xeon LGA771 - LGA775 mod, but it's certainly a nice option to have. :)

It turns out that the system will halt but not power off by itself, which means that I need to manually hold the power button for 4 seconds after OS X has shut down to make the machine power off. When using the exact same installation with an NVidia GTS 450, the system powers off by itself...

Just wanted to share my success story with building and installing a CustoMac made from old parts, using UniBeast and MultiBeast. Admittedly, it is not the first time I've installed OS X on this particular rig, but with the magic of Clover, it has definitely been the smoothest install by far...