What is the difference between FLR-SFP and SFP+?
For example what is the difference between cards HP 570SFP+ and HP 570FLR-SFP+?
Which one it's better to buy?
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The "FLR" stands for FlexibleLOM Rack... And "LOM" means "LAN-on-motherboard". So the FLR is really a modular motherboard-attached NIC that does not consume a PCIe slot.
Gen8 ProLiant's have one slot. I believe the Gen9's have two slots. So if you want your 10GbE to be in PCIe form-factor, get the HP 570SFP+. If you want it on the "motherboard", use the FLR adapter.