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What is Spread Spectrum?

post #1 of 8
Thread Starter 
I just wanted to find out what does it do/benefits? I have it as an option in my Asrock mobo but not sure how it can affect an overclock.
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post #2 of 8
It alleges promoted stability in stock systems but is useless when OCing and can cause issues when OCing.
    
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post #3 of 8
I haven't covered this yet in any of my lectures but I believe that it has something to do with the limitation of EMI output from electronic devices. Obviously this is perfectly fine when set to enabled on a computer system running at stock clocks but when bus speeds are increased Spread Spectrum can hamper and intefere with the overclock if it isn't disabled.
post #4 of 8
I believe you are correct re: the EMI aspect from what I recall, but then again I don't know jack about the electronics at that depth compared to you.

Your avatar may have an EMI issue too I love the avatar
    
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post #5 of 8
If I remember correctly, Spread Spectrum is a setting that fluctuates the clock frequencies on key components in the computer by a few Hz in order to cut back on harmonics and EMI instability issues. Some people believe that this is a bad thing because in theory it can increase an overclock past the safe limit if you are already at the limit. However, I have never had a problem with leaving it enabled.
 
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post #6 of 8
"The BIOS usually offers two different levels of modulation - 0.25% or 0.5%. That's the amount of modulation (or jitter) from the baseline signal. The greater the modulation, the greater the reduction of EMI [Electromagnetic Interference]. Therefore, if you need to significantly reduce EMI in the surrounding area, a modulation of 0.5% is recommended.

AND

Spread Spectrum can also cause problems with overclocked systems, especially those that have been taken to extremes. The slight modulation of frequency may cause the processor or any other overclocked components of the system to fail, leading to very predictable consequences. Of course, this depends on the amount of modulation, the extent of overclocking and other factors like temperature variation, etc... As such, the problem may not readily manifest itself instantly.

Therefore, it is recommended that you disable this feature if you are overclocking your system. The risk of crashing your system isn't worth the reduction in EMI. Of course, if EMI reduction is important to you, enable this feature by all means but reduce the clock speed a little to give this feature some "space" to modulate safely. If you are not overclocking, the decision to enable or disable this feature is really up to you. But if you ask me, unless you have EMI problems, it's best to disable this feature to remove the possibility of stability issues"

-goldfries
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post #7 of 8
Thread Starter 
Thanks for the info guys. I'l just disable it for now.
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post #8 of 8
Quote:
Originally Posted by mithrandir View Post
Thanks for the info guys. I'l just disable it for now.
just leave it disabled no matter what.
pretend it isn't even there.
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