My understanding is that it takes 3 BUFGs and one DCM for tri-mode (maybe one more of each for RGMII support but I don't see that) and, between this and other USRP2 needs, you ran into the limit of 8. Is that accurate? Or would 10/100/1000 support would take more than 3...
I can't say how many clocks a _good_ 10/100/1G system would need, but the Opencore required 4. One thing to keep in mind is that while there are theoretically 8 global clocks in the S3, other limitations mean that it can be difficult to use all 8.
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