Radeon 5870 in a 2006 Mac Pro?

[wesker]

I've been considering buying one of the new Radeon video card kits and throwing it in my 2006 Mac Pro.

I would prefer the 5870 but for the most part, the opinion online is that it wouldn't work. However, I came across this link:

http://www.barefeats.com/wst10g3.html

So what gives? How did barefeats pull it off? Could it have been using the boot drive really played such a role? I kept reading it couldn't be done due to the lack of EFI64.

My Mac Pro overview is:

Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 4
L2 Cache (per processor): 4 MB
Memory: 4 GB
Bus Speed: 1.33 GHz
Boot ROM Version: MP11.005C.B08
SMC Version (system): 1.7f10

 

[DualShock]

https://forums.macrumors.com/threads/1002692/

I have been meaning to update the first post for a while, but still haven't gotten around to it.

Towards the end of the thread there are a few folks that got a 5870 working in a 2006 1,1 Mac Pro.

Also a former colleague of mine in the UK has a 5770 running in his 2006 Mac Pro.