It's not something that you just plug all the stuff in, and it just works.
You have to configure it properly, or you're limited to 1 gigabit incoming.
I'm aware, hense 4 nics purchased, all same make/model that were capable of teaming. Switch was configured and wired in the proper fashion but never got any different results. then from up above. What OS were you doing this on?
In switch independent mode, you have 2 gigabit outgoing and 1 gigabit incoming
In switch dependent mode, you have 2 gigabit outgoing and 2 gigabit incoming
The switch needs to be manually configured (unless you use software defined networking) to use LACP (IEEE 802.1ax Link Aggregation Control Protocol) to create a aggregated connection to allow switch dependent mode to work.
Hmmmm Wonder if it was the switch. I'll have to check if it was capable of dependent mode.