Hi folks, Forgive me, but I've had a few frustrating days. Installing both Yosemite and El Capitan was trivially easy following the instructions on the first page of the thread (install via target disk mode from eligible machine, swap in Pikes boot.efi, repair permissions, done) That was awesome. I then hastily and foolishly pulled the trigger on this nVidia GTX 750Ti SC card from Amazon after reading multiple posts on multiple forums that essentially said "nVidia cards work oob and work better with the latest web drivers". The GTX 750 was noted as a card the required the web drivers and wouldn't display a boot screen on page 1 of the MacPro 1,1/Yosemite thread. A new 2GB, DDR5 card for $150 was impossible to resist and I accepted those caveats. I take FULL RESPONSIBILITY for not reading ALL the threads. I realize that most, if not all the people here are trying to help one another. I'm not angry or blaming anyone other than myself. The linked card above did not work either oob or with the correct web drivers for either Yosemite or El Capitan. It's going back to Amazon. I'd really appreciate if someone could steer me to a currently available card that they are currently using on a "stock" MacPro 1,1 that works with Yosemite and El Capitan. Here's what looks to me to be an option: GeForce GT 640 but I hesitate bc it's PCI 3.0 and much of the performance will be lost in a PCI 1.0 box... So, please, if you could list your card here, I'd appreciate it. I'd rather not have to wait to get a card flashed, so please share your experience and PLEASE, if you don't know that given card works, don't speculate unless you are truly an expert. Thanks!