Hi Marcos,
The new system requirements are higher for 2 reasons. First, they are set to reflect hardware that is currently available for purchase. The GTX 750 is a couple years old now and it would be pretty hard to find one. 🙂 Second, they are meant to leverage the increased performance that will become available when we go to the 64 bit version of the software later this year.
Hope that answers your question.
Neil