[MaadDaawg]

Now I'm thinking it's a driver issue.

cards 2,3,4 ran fine as a tri sli - so I thought it might be the oc key. Removed that and put the bridge back on with all 4 cards enabled, and the nVcp told me I had tri sli. Even though it graphically depicted 4 cards

wtf??

Well, further testing reveals it's not a driver issue either. Doesn't appear to be connected with power distribution either. The most it wants to recognize is 3 GPUs and 1 Phyx card, which doesn't really help with Vantage.

Any thoughts?