Will it work on a Dell 730XD QLogic 57800 2x10Gb DA/SFP+ NIC?

No, this 1.25G SFP-T transceiver is a 1.25G module, but the SFP+ ports of QLogic 57800 2x10Gb DA/SFP+ NIC are 10G, their rates don't match. We recommend you to buy 10GBase-T SFP+ to RJ45 Transceiver through https://store.10gtek.com/10gbase-t-sfp-30m-copper-rj-45-cat-6a-cat-7-transceiver-dell-force10-compatible-module/p-5216