Come across vs. Come across with

 Come across phrasal verb [Phrasal verb]

-To come across somebody/something to meet, find, or discover someone or something by chance

e.g. I came across an old diary on her desk.

-If an idea comes across well, it is easy for people to understand

e.g. Your point really came across at the meeting.

Come across with something [Phrasal verb]

-To provide money or information when it is needed

e.g. I hoped he might come across with a few facts.