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Overclocking with speedstep enabled?

post #1 of 12
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Is it possible to overclock my cpu (to say, 3.2Ghz) and have speedstep on at the same time so that at idle the vcore and cpu speed are reduced?

Basically I want the cpu to be underclocked at idle, but overclocked at load. I tried changing the bclk to around 160 but that didn't work. Is having the vcore increased all the time the only way to have a stable overclock?

Also, how common is it that overclocking stops POST from completing and forces me to reset the bios?
Edited by Daggerfist - 11/1/11 at 6:03am
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post #2 of 12
It is advised to disable speedstep while overclocking, but you can enable it after you have found your goal, though it may cause instability, so if your stable overclock fails after enabling it, you know what's wrong.

Stopping POST is quite common, though most boards have a feature to detect this and reset themselves while keeping your setting in the bios, don't know about your board, but even my old 775 board had this feature.
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post #3 of 12
I used to have ur very same mobo and many people use speed step while overclocking because they like they very same idea ur suggesting plus u will allmost never run into the problem of no posting if uve done the overclock corectly. Like i said i used to own the mobo u have and ran a 4.2 overclock for a year and had no problems.
Edited by scrotes - 11/1/11 at 6:04am
    
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post #4 of 12
Quote:
Is it possible to overclock my cpu (to say, 3.2Ghz) and have speedstep on at the same time so that at idle the vcore and cpu speed are reduced?
yes
Quote:
Basically I want the cpu to be underclocked at idle, but overclocked at load. I tried changing the bclk to around 160 but that didn't work. Is having the vcore increased all the time the only way to have a stable overclock?
no you can set vcore to auto in bios which will probably run stable (did when i tried it) but it will increase to a ridiculously high vcore at load and a ridiculously low vcore at idle. so imo a constant vcore is better.
Quote:
Also, how common is it that overclocking stops POST from completing and forces me to reset the bios?
very, means it just isnt stable.
post #5 of 12
Any success stories? When using 'offset' settings do voltages drop to intended values when SpeedStep kicks in?
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post #6 of 12
Quote:
Originally Posted by markanini;15532871 
Any success stories? When using 'offset' settings do voltages drop to intended values when SpeedStep kicks in?

I run my X58 Sabertooth system in offset mode with all powersaving options enabled and as you can see Vcore does go down when system is idling.
attachment.php?attachmentid=236970&stc=1&d=1320180979
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post #7 of 12
Cool. Did you compare idle voltages at stock settings?
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post #8 of 12
Quote:
Originally Posted by markanini;15532871 
Any success stories? When using 'offset' settings do voltages drop to intended values when SpeedStep kicks in?

been running offset with speedstep since i built last winter...

idle around 1.016v @ 1.6ghz and loads about 1.392 @ 5ghz
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post #9 of 12
Quote:
Originally Posted by markanini;15534940 
Cool. Did you compare idle voltages at stock settings?

That's with an i7-930 running at 4.2 Ghz, BCLK has been raised to 200 from original 133 so it's now idling at 2.4 Ghz instead of original 1.6 Ghz. I don't think stock Vcore would be quite enough for that.
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post #10 of 12
I have had my i7 920 C0 overclocked to 3.5Ghz with offset and all power saving features enabled including speed step for quite some time now. It is 14~ hours prime95 blend stable and I haven't had a single blue screen or corrupt file.

At idle the voltage drops to what it would at stock (1.040) and the speed drops to 2Ghz. At load the voltage raises to 1.248 and the clock speed raises to 3.5Ghz.

If you want this to work you must have Vcore set to normal and use the offset setting to add voltage as needed for your specific clock and CPU.
Edited by Derp - 11/1/11 at 4:20pm
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