Yeah I use em with no problem. They're nice because some PSUs have a lot of wattage but they lack on the PCIe connector side of things. If you use some of the adapters you can fit a few more cards in.
Make sure that you are using the connectors with 2x4pin molex on em
rather than one with just 1x4pin molex
They
might work but a few guys posted a couple weeks ago with their cables burning out because the one molex to pcie couldn't supply enough power.