Cinebench is also an old GPU benchmark. People should use more modern (i.e. real world) benchmarks.The Cinebench testing is only accurate at differentiating between CPU's. The GPU test is not representative and not accurate enough. Even the developers have said this as it relies too much on vendor driver optimisations.
Try using Unigine for OS X and also CompuBench (free Mac App Store app).Sorry, I don't have a windows license and have no desire to get one. If there is a free / open source benchmark tool you want me to run (OSX) that is relevant, I'll give it a go.
Keep in mind, I don't actually care about benchmarks and would have kept the machine regardless of score. So, this isn't something I plan to spend all day doing. I assumed there would be other, more accurate tests out by now.