I don't believe a new processor is needed.
Maxon 4D states the minimum processor needed is the Pentium 4.
I think the confusion is because Intel re-used the Pentium name. Pentium - Wikipedia, the free encyclopedia
Maxon 4D states the Pentium, Pentium II, and Pentium III are not supported.
I think they are referring to the original Pentium, not the new Sandy Bridge Pentium.
I'd guess they wrote that before the new Sandy Bridge Pentium was released.
I believe the current Pentium (Sandy Bridge) should meet the "Minimum Pentium 4" requirement.
The Sandy Bridge Pentium is nothing like the original Pentium released in 1993.
I could be wrong, but I would not buy a new CPU without getting confirmation from Maxon 4D that a Sandy Bridge Pentium is not supported.