It's a 9.3% boost in clock speed, will result in an additional 9.6 GFLOPS more total CPU compute (112gflop vs 102.4gflop). One jagaur core @1.6 puts out 12.8 GFLOPS, so the boost gives the equivalent of 3/4 of another core - not bad. Though, I'm not sure what kind of in game performance it will actually result in.
It originally actually slowed the PC down to a set, spec frequency (8Mhz IIRC) as some x86 software was tied to the frequency and performed badly with higher clocked chips. So getting "Turbo speed" was actually with the switch off, not on.
It's significant in that it's more than we thought it would be, and it will obviously help games, however little that may be. And, no, they gain nothing at all by somehow trying to respond to PS4 using these types of methods. Pretty certain these changes are stuff Microsoft are free to make because they designed well enough, but they aren't things they're doing to try and one up Sony. That would be incredibly dumb and pointless.
He's right, if the 1.6 number holds for PS4. The KZSF tech slides in Feb said 1.6 GHz and 6 cores which was exactly in line with what XBO's CPU was before the upclock. There's a chance that PS4 may have less than 1 core dedicated to the OS (according to GopherD) but that rumor is very old and things could have changed when they increased the RAM reservation for the OS. I'm really curious to see why Sony hasn't released CPU specs yet, I'm really curious and they've been extremely open about everything else.
This is actually worrying. Are they still even trying to finalize specs at this stage? September is a bit late for that... Could even mean they haven't started production of the console which explains MS hesitance on revealing a release date along with tier 1 and 2 bullshit.