Thanks for the reply, Lou. Very much appreciated. When you say 'the rear piece has to be removed' I assume you mean the black extension in pic 1, not the heatsink(?) in pic 2, yes?
One other question which is really worrying me is if I install the card and boot the Mac and it doesn't work, what will happen and how do I get out of the situation? I simply can turn off the Mac and put the original AMD 5770 card back in? Mightn't be hard at all, I just can't afford to screw up my Mac for any period of time. Thanks in advance for your help.
Wade
Yes, Pic 1.
Yes, to the second question. Hold power button for 5 seconds.
Lou