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If you need 8 ports, you might use the 6708. Whether that's the best choice also depends on how much capacity you need per port (VS-S720-10G only supports 40Gbps per slot) and/or whether you want VSL support on the line card's ports.
The only major consideration might be to "match" any line card's DFC with your sup's capabilities, e.g. non-XL vs. XL.
