ATI XFX 5770 compatibility issue with mac pro 5.1

Hi guys, very new to forums (this is my first ever post), so if there are any rules which I'm breaking please enlighten me.
Anyway, I sold a HD 5770 on ebay a couple of days ago with its description being that of being compatible with mac pros after 2010, as which I believed it to be according to the following link:
http://support.apple.com/kb/ts3891
It sold, and a couple of days later got an email back saying its not compatible with his 2010 mac pro 5.1. I was wondering if there were any drivers/downloads which might have to downloaded in order for it to work. Any help is greatly appreciated, thanks.
 

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