Old Mac Pro's - Why they aren't so good
There's a couple of reasons why the old Mac Pro's aren't quite as good as we'd like.
1. The CPU's are quite old now. They are power hungry and noisy and not that fast.
2. There is no EASY way to add two decent graphic cards, I know because I did it, you can have dual 5770's but you can't put dual 280X cards in as the MB won't take the load. There are ways round this but they're not easy. This is the number one reason I didn't replace my old one.
3. USB 3.0 isn't built in, I know you can add an internal card, but thats more hassle. There's also not many PCI slots.
The big issue for us was the lack of dual GPU's. We really, really wanted to buy a new Mac Pro but the lack of expandability, the lack of decent GPU's, the sheer high cost meant we didn't buy a new mac pro and replaced our old Mac Pro with a hackintosh. if Apple get their act together and get a decent expandable mac for the 2018 market, we'll look again. Until then, forget it.