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Why my Q9550 Multiplier changes to 6.0 then 8.5

Last response: in Overclocking
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May 18, 2009 3:07:33 PM

I just did my first OC in my Q9550 i changed the FSB to 360 so it can OC to 3.0ghz.

So i restart computer and opened CPU Z and it shows the Multiplier as x6.0 so my current speed now is 2.1ghz, sometimes i can see that it changes to x8.5 but i don't know why, what do i need to do? has anyone experience the same thing.

More about : q9550 multiplier

May 18, 2009 3:17:13 PM

Speedstep lowers the multiplier and voltage when the higher speed isn't needed.

that's whats happening.
May 18, 2009 3:24:28 PM

go into your bios, advanced cmos - disable c1 state.

will keep the multiplier on the higher setting.
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May 18, 2009 3:32:29 PM

Helloworld_98 said:
Speedstep lowers the multiplier and voltage when the higher speed isn't needed.

that's whats happening.



What are a good Vcore numbers? when is at stock 2.8ghz Vcore is 1.17v and when it is at 3.0ghz is at 1.27v

I don't know whats a good range so it can be stable.
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May 18, 2009 9:29:06 PM

montyuk said:
go into your bios, advanced cmos - disable c1 state.

will keep the multiplier on the higher setting.


Why though? There's no disadvantage to leaving speedstep on, and it lowers power usage and heat at idle.
May 18, 2009 9:44:17 PM

+1
May 18, 2009 10:23:10 PM

cjl said:
Why though? There's no disadvantage to leaving speedstep on, and it lowers power usage and heat at idle.



the op is trying to keep his machine at the higher setting, i admit that speedstep is useful but whilst hes still testing his system at the higher settings it makes sense to keep it there.
May 19, 2009 4:30:50 AM

montyuk said:
the op is trying to keep his machine at the higher setting, i admit that speedstep is useful but whilst hes still testing his system at the higher settings it makes sense to keep it there.

I'm not sure I understand your point. Unless a system requires C1 to be turned off for overclocking, or disabling it allows for higher clocks, there's no point in turning it off. The switching from lower voltage and clocks to the stock clocks takes milliseconds, so the impact on performance, or 'testing' that you've referred to, is non-existant.
May 19, 2009 9:49:27 AM

fine, i concede.

i appear to have misinterpreted the op post. i was under the impression he didnt want it to use the 6x multiplier. now i re-read it all he wants is to know why it happens in case something was wrong.
May 19, 2009 11:01:55 PM

cyberman86 said:
I just did my first OC in my Q9550 i changed the FSB to 360 so it can OC to 3.0ghz.

So i restart computer and opened CPU Z and it shows the Multiplier as x6.0 so my current speed now is 2.1ghz, sometimes i can see that it changes to x8.5 but i don't know why, what do i need to do? has anyone experience the same thing.

The CPU only runs higher when it needs to. This is an energy savings feature. Some claim you get better performance with it disabled. I have not seen that in my system. Since I leave my system on most of the time I appreciate the added savings.
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