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Jaimie: you need to count package pins, not signal I/Os. Your 625 MHz XGMII using LVDS differential signalling requires 76 pins, which is the same pincost as the 312.5 MHz XGMII using single-ended drivers. In addition, you would need to run at least part of your logic at the 625 MHz which is significantly more difficult to implement than staying with a clock frequency of 312.5 MHz.