This is a reference card

This is not.

The difference regardless of PCB color, is the AMD above the PCI-E connector. On my 4890's, there are two versions, both reference, but with red or blue PCB's. Drove me crazy trying to find a second one too since they are the OC version.

So, THATS how you know whether or not you have a reference card without some 'tool' telling you +1 if you get the double entendre lol.