Sapphire HD 7950-Start up screen missing.PC/MAc switch ??

Ive tried to save some dosh, by updating my a mac 3,1 with a new graphics card......
My mac is a 3,1... Ive put the card in and installed Maverick, up to date.
There is no start up screen, though the cards works, just black screen for 30 seconds and then your in....
There is a PC/mac switch on teh card to sellect PC or MAc use...
It doesnt make any differance which its set , it still works and it still doesnt give a start up screen.
I know on the Sapphire site its says MAc 4,1 upwords....but Im sure lots of people are using in their Mac 3,1.?????
Any help much apprecited....

+1
I have the 2009 MP and recently installed the Sapphire HD 7950. This card shows the unpleasant behaviour of letting the monitor black until the user selection appears. If I try to select the startup disk (pressing "option" upon start), the screen stays black and I cannot select any boot volume.
OK, fine, this wouldn't be too big a problem, if I wouldn't need to switch to my bootcamp drive from time to time.
Does anybody know how to solve this conundrum?

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