Tom's Hardware > Forum > Overclocking > CPUs > Why my Q9550 Multiplier changes to 6.0 then 8.5

Why my Q9550 Multiplier changes to 6.0 then 8.5

Forum Overclocking : CPUs - Why my Q9550 Multiplier changes to 6.0 then 8.5

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cyberman86   05-18-2009 at 05:07:33 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.

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Helloworld_98   05-18-2009 at 05:17:13 PM
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Speedstep lowers the multiplier and voltage when the higher speed isn't needed.

that's whats happening.

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montyuk   05-18-2009 at 05:24:28 PM
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go into your bios, advanced cmos - disable c1 state.

will keep the multiplier on the higher setting.

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cyberman86   05-18-2009 at 05:32:29 PM
- 1 +

Helloworld_98 wrote :

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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cjl   05-18-2009 at 11:29:06 PM
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montyuk wrote :

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.

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Message edited by cjl on 05-18-2009 at 11:29:26 PM
------------------------------ Asus P6T deluxe
i7 965 @ 4.2GHz (200*21), 1.384V
12GB Corsair Dominator DDR3-1600 CAS 7
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montyuk   05-19-2009 at 12:23:10 AM
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cjl wrote :

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.

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KyleSTL   05-19-2009 at 06:30:50 AM
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montyuk wrote :

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.


Message edited by KyleSTL on 05-19-2009 at 06:31:24 AM
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montyuk   05-19-2009 at 11:49:27 AM
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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.

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zipzoomflyhigh   05-19-2009 at 04:36:18 PM
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Its amazing what you can learn by reading your cpu/mobo manual.....

------------------------------ P965/Q6700@3.2 8MB HD4850 OC Edition
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Vista64/Win7
Fatality 550w/Antec 300
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pajama   05-20-2009 at 01:01:55 AM
- 0 +

cyberman86 wrote :

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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