That's a top quality PSU. Have you used it with anything else?
To get 8 PCI-e in one PSU it is normally higher quality companies. (There are a few exceptions). But for most part I think people have used nice PSU's. Personally I gold on most everything.
A lot of people trying to lower cost keep asking about using 2 lower PSU's. You could buy 2 500 watt with 4 PCIe much cheaper. But I won't risk using two myself.