Genuine Mac GPU? Help wanted.

Hi everyone,
My Nvidia GeForce 8800 finally gave up after 6 years of faithful service in my early 2008 Mac Pro 3,1. I sourced a replacement card on eBay which was listed as a Mac Pro ATi Radeon HD 5770 1GB. The seller told me the card had come from his old Mac Pro. He told me it was a Mac Pro card and not a flashed PC one, and that the boot screen showed up (as it should with a genuine Mac card). However, on receiving and testing the card, I get a black screen at boot-up and none of the boot options work (safe mode, system check, etc.). The card also seems slower than my old 8800 when using Photoshop. I've contacted the seller and he's swearing blind that there were boot options on his Mac with this card. My question is, other than the black screen and lack of boot options, is there any other way to tell if a GPU is a flashed PC one or an original Mac?
Thanks in advance of any help with this issue,
Dave

I'd heard about baking the 8800 but didn't try it. I figured at 6 years the card had already served pretty well, especially as some seemed to have had failures after just a couple of years. The ATi Radeon HD5770 card I received looks like this:
The Apple one listed on Amazon looks like this:
There's a clear visual difference between the two, but I'm not sure whether this is just design variation or an actual difference between the PC and Apple versions. Anyone?

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