I bought HIS Radeon HD4870 512MB DDR5 for my Mac Pro 2006 1.1. The first problem I've found it that card will not fit to slot 1, because of too long screws. So I installed it in slot 2, leaving 7300GT in slot 1. The next problem was how to get rid of these power cables - I've tried the more elegant way taking that molex adapter under HDD trays, but cables where too short :/ So I installed them on the right of Superdrive's tray. Now on Mac OS X I got kernel panic (probably the injector thing). On Windows Vista card is detected, but automatically disabled (probably not enough power or just PCI-EX 1x slot is not compatible). Here are photos from the operation. I'll try to install Accelero S1 rev. 2 with Noctua 120 mm fan and will see how things go I've also ordered two special Apple PCI-EX power connectors from Austria.