Folks, I could use some help here, if you could. A few weeks ago, I got a used Mac Pro 1.1 in excellent shape. It came with two video cards, one of which is in the system right now and it is an NVidia Quadro FX 4500, with 512 MB of memory. It had OX-X 10.6.something installed, I upgraded it to 10.7.5 without a problem and everything was running fine. My intentions for this machine was to use it for my photography, running Aperture. At this moment, I am using my iMac (early 2009) for this task, with Mavericks 10.9.5 and Aperture 3.5.1. Now, the issue I have with 10.7.5 on the Mac Pro, is that it doesn't support Aperture 3.5.1, so every time I copy my Aperture library from the iMac to the Mac Pro, I have to rebuild it, in order to be usable by the Aperture version I have on the Mac Pro. That can be frustrating, so I decided to upgrade the Mac Pro to Mavericks and see how it would go. After reading several article on the net, I've managed to create a bootable USB drive, which I used to install Mavericks 10.9.3 on a new disk on the Mac Pro. Unfortunately, it appears that with 10.9.3, only 8 MB are recognized from the 512 MB that my NVidia card has. Of course, with so little memory Aperture refuses to run. I also tried to install 10.9.5 on the Pro, again, everything works fine, except only 8 MB of memory are recognized. This time Aperture does run, but it doesn't work correctly. It doesn't show the photo in the main window, only the thumbnails in the browser strip. I was wondering if there is a solution to this problem, in other words, if it is possible to convince the system to recognize all 512 MB of my video card memory.