Hi Mikesid, You can use both SFP+ ports. The SFP combo ports are shared with the copper ports though. Let us know if you have any other questions.
Hello everyone. We have three 3148P switches. One of the switches im trying to use both SFP+ ports. I get light on one but not the other.  I'm using the correct transceiver and fiber patch cords (everything is MMF).I think its an issue with the fiber, but I wanted to double check to make sure both SFP+ ports can be used at the same time? I made sure both ports are up (no shutdown) in the CLI.   
Dell 3148P SFP+ ports