The R710 would have supported dual processors from day 1, so it isn't a BIOS update needed to allow a second one. It may be an issue with the second slot, but that is less likely. Does the stepping of the two processors match exactly? Even though the R710 supported two processors from the beginning, I would still recommend updating the system firmware (iDRAC, BIOS, ESM) just in case there is some additional support added when upgrading or when encountering some random/one-off issue.
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