Looking at the configuration utility, it looks like each port can be sectioned into 4 partitions, as you mentioned. However, you can navigate to the F2 menu, Device Settings, the NIC, then NIC Partitioning Configuration. Under the configuration menu, you can go to individual NIC partitions and disable them. I would leave 1 and 2 on, then turn off 3 and 4 for both ports to see if that gets you what you need.
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