i5-4200M Processor FSB speeds???

saintsfan384

Honorable
Jan 12, 2014
2
0
10,510
I'm looking at the Lenovo Z510 vs. the Z410. Comparing the two, the only difference I see is in the MHZ #, 400 vs 1600. Through some research I believe I've identified this as the FSB speed. Sounds like this is important. The price is comparable...is there a major difference here?

4th Generation Intel Core i5-4200M Processor (2.50GHz 1600MHz 3MB)

4th Generation Intel Core i5-4200M Processor (2.50GHz 400MHz 3MB)