Again I ask, exactly how many transactions can IOTA handle at max capacity?
This is not the correct way to ask a question.
Instead i will answer by saying the
minimum max "i" have seen so far is 800tps. and zero fee kicks ripple's ass rippling.
Iota by design scales with faster tps when there is more activity on the network.
The general answer would be as fast as the data transfer speed on a communication cable/device can handle.