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If you connect via 10gbit PCIe extension cards it is often a question of how many PCIe channels the CPU has and if the mainboard you are using has these connected directly to the CPU or needs to pass them through the mainboard chipset which is much slower.
For a dual port card, you will want an 8 lane PCIe 3.0 slot connected to the CPU. Almost any desktop CPU will have enough lanes since you won't be using a graphics card. You can get by with a 4 lane slot, but you won't be able to max out both ports bidirectionally at the same time.
These ThinkCenter M720q machines I'm looking at all seem to have a single PCIe 3.0 8x card slot, regardless of the CPU, and that seems to be all that the Mellanox ConnectX cards need according to their spec sheets, so hopefully that is good.