The 9700 non-pro has the same memory bus (256-bit) as the 9700 Pro, just clocked slower.
The 9700 is clocked at 275 core/270 memory compared to the 325 core/310 memory of the Pro. In the end the the 9700 is just a tad slower then the 9700 pro.
The 9500 is the chip with half the memory bandwith not the 9700, the previous poster was mistaken.
As for tweaking, a lot of 9700NPs come with slower memory such as 3.3n instead of 2.8 and can't quite overclock to the pro level but they can get close, as for the core it can almost always get up there.