I might be looking at it wrong, but it seems that one (or maybe both?) of your GPUs are connected to your PSU using a molex adapter (molex 4-pin to PCI-E 6 or 8 pin). Looks something like this:
http://bigbytepc.net/images/molexpcie.jpg. I guess it's alright to use such adapters in a more low-end/medium system, but for crossfire you really should look into getting a PSU with the proper connectors. Should be noted that usually molex isn't good to use for the high current that a modern GPU needs. I think the really high-end ones are classified for 11-13 amps.
Edit: But hey, if it works it works.