Ati Radeon 5770

Hi guys,
My graphics card has recently failed (8800gt) and am currently running on a nvidia gt210 (yes it's poor). This card is not a mac card and does not display the boot screen, but works when the machine has booted. So my question is what is the best card I can get for a Mac Pro 1.1 (2007)? Does the ati 5770 work correctly? Does it display the boot screen, because whatever I have read on it it says requires 2008 mac above... I have MAC OSX 10.7.5. I want all information possible as I don't want to spend £200+ on a graphics card that won't work correctly...

RE: Mac Pro silver tower (2006-2012) Replacement Graphics cards
1) Apple brand cards,
2) "sold in the Apple store" cards, and
3) "Mac Edition" cards ...
... show all the screens, including Boot up screens, Safe Mode, Installer, Recovery, debug screens, and Alt/Option boot screens. At this writing, these choices include:
1) Apple brand cards:
• Apple-firmware 5770, about US$250** works near full speed in every model Mac Pro, Drivers in 10.6.5
• Apple-firmware 5870, about US$450
2) "sold in the Apple store" cards
• NVIDIA Quadro 4000, about US$1200
• NVIDIA Quadro 5000, about US$2500
3) "Mac Edition" cards -- REQUIRE 10.8.3 or later:
• SAPPHIRE HD 7950 3GB GDDR5 MAC Edition, about US$480** Vendor recommends Mac Pro 4,1
• EVGA GTX 680 Mac Edition, about US$600
The cards above require no more than the provided two 6-pin aux power connectors provided in the Mac Pro through 2012 model. Aux cables may not be provided for third-party cards, but are readily available.
If you are Meet ALL of these:
• running 10.8.3 or later AND
• don't care about "no boot screens" etc AND
• can re-wire or otherwise "work out" the power cabling, THEN:
You can use many more cards, even most "PC-only cards"