BCLK clock and turbo boost

[mason marnell@1457018692]

With all the talk of overclocking non-k skylake CPUS, I was going to do some calculations for what clock speed I could achieve, but I was wondering If the highest turbo frequency is what overclocked or the minimum frequency. For example on an i5-6400, is it 2.7 GHz or 3.3? Thanks

 

[joex444]

If you overclock BCLK, it affects both.

For example, a 2.7GHz that turbos to 3.3GHz stays at BCLK = 100MHz it just changes from 27x to 33x. So if you can run at BCLK 103MHz (+3MHz), then you'll get +100MHz at turbo and +81MHz normal. So 2.78GHz and 3.4GHz.

 

[mason marnell@1457018692]

Oh I thought It disabled turbo and just kept it at one clock speed.

 

[Eximo]

They do that for stability on the high end. It is much easier to control a fixed frequency and voltage then have adaptive, dynamic, or offset voltage to accommodate boost.

In the recent review article their maximum boost frequency would have been 5.2Ghz which is an unrealistic speed. Whereas setting the BCLK to a high value with the base multiplier resulted in a very reasonable 4.4Ghz.