Hello all, I've searched the forum for keywords such as 7950, power requirements, etc. but wasn't able to find a definitive answer on this. I think there seems to be debate, primarily around anecdotal experience vs. system recommendation. I digress. I recently picked up a second-hand Mac Pro. I believe it's a 4,1 with the following hardware: 2.66 Ghz Quad-Core Intel Xeon 12GB DDR3 RAM 640GB HDD GeForce GT 120 512MB My current plan is to add an SSD and replace the video card; it's that latter upgrade I have a question about. I have an opportunity to buy one of two 7950 models for $100 a piece: a Gigabyte Windforce 7950 3GB or a MSI Twin Frozr 7950 3GB. Both very comparable, well-performing, albeit non-Sapphire Mac 7950s. And both just a fraction of what a Mac Sapphire 7950 would cost me. I was looking at this image of the Gigabyte board and this image of the MSI board, both courtesy of Newegg, and saw that they have 2 6-pin connectors. Great, no problem based on what I read in the forums - flash and go! But the seller for the boards confirmed for me that both cards actually have 6+8 pin connectors. And I'm reading conflicting information about what I should do. My ultimate question is 'can I buy one of those boards, install it into the Mac Pro 4,1 and have it work?' but to answer that it sounds like there are two sub-questions: can I use molex connectors to convert a 6-pin to an 8-pin connector for this, or can I just plug in two 6-pin connectors? some users recommend an "auxiliary power supply" - what does this entail and how is it different from just replacing the PSU? Any links to appropriate threads, tutorials and the like are much appreciated. Thanks in advance!