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Looking at the Dell PowerEdge R610 Technical Guide, page 13 under "Optional 1GBe and 10GBe add-in NICs" section, it mentioned Intel X520-DA2, I'd suggest
confirming with Dell Support the details of testing before including X520-DA2 in their list. Details such as server configuration, installed slot, operating system used, NIC configuration and driver used.
kindly refer to Dell PowerEdge R610 Technical Guide link below, please take note Intel does not guarantee the content in that site.