Turbo

JonJ678 · 17 Jul 2009 at 07:51

Hey. Just a short question here.

I believe the i7 920 has a maximum multipliar of 20, so 4ghz requires a bsck of 200. However there is something called turbo which I haven't met before, am I correct in that it adds 1 to the multi when only one core is under heavy use?

So 191 x (20+1) under turbo is also 4ghz.

If the above is correct, then I am confused. If when under heavy load it drops to x20, then the chip is then running below 4ghz.

Would 200x20 without turbo not be far better than 191x21?

ViRuS2k · 17 Jul 2009 at 08:11

Nope, when turbo is enabled 20x200 = 4.0ghz in turn when under load you gain a extra multiplyer 21x200 = 4.2ghz.

PaulyD · 17 Jul 2009 at 08:23

ViRuS2k said:
Nope, when turbo is enabled 20x200 = 4.0ghz in turn when under load you gain a extra multiplyer 21x200 = 4.2ghz.

In Jon's post his first example was without turbo enabled.

Running at 20x200 would be better overall rather than 191x21

robin66 · 17 Jul 2009 at 09:39

20x200

I'm not sure about far better, but better yes.

As you'll be overclocking other parts of you system that little bit more.

JonJ678 · 17 Jul 2009 at 11:44

That's a nice surprise, looks like I did know what was going on after all. Thanks

Blackhorse · 17 Jul 2009 at 12:53

i leave turbo turned off.
i use 20x200 with speed step enabled.
To go above 4ghz requires more power and more heat something i would in never actually need in gaming.
shame the memory multi is only giving me 1603 from my 1800 memory.
My hoping the new asus firmware will add extra multiplyers