Price, voice processing and performance.
Compared to the old models each bar has only half the height, where there was no collision problems with the old ties regarding base coolers (fit loosely under the Big Shuriken, Mugen 2, etc.).
Crazy how low the RAM has become ever. - A little over a year ago I had just paid 4 times (!).
Now is a good time to upgrade inexpensive! (Of course, specific applications, with me on the basis of sound and video processing, as well as some FF 14 online ...)