So far my experience is a bit different. I’ve got a spare 3,1 2x 4 core that I’ve been experimenting with a bit…
Have 10.9.5 running right now, no problems at all. Tried a few different GPUs but haven’t settled just yet – I really want a GTX 9xx in here, but those don’t work with Mavericks. But all the earlier-than-Maxwell GPUs I’ve tried have worked just fine so far.
Have a Yosemite boot drive on there with a brand new GTX 970, which besides the problem with CUDA and Yosemite, works beautifully. Hopefully Nvidia and Apple get that sorted quickly, because it could breathe new life into an older system.
No doubt the PCI bus is a bit of a bottleneck, but in terms of usability, GPU improvements are noticeable.
cheers,
John
John Tissavary
colorist
The Post Collective NYC