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Old 5th June, 2002, 02:59 PM
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What is "Spread Spectrum"

I see this thing in my BIOS all the time and I have no idea what it does. Can anyone explain it to me?
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Old 5th June, 2002, 03:14 PM
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Quoted by Tomshardware article

"Spread Spectrum Control: This function is used for meeting the specifications when complying with the CE acceptance test. Enabling it leads to a noticeable deterioration in performance. That's why it should always be disabled!"

http://www.tomshardware.com/howto/01...tuning-17.html


I have heard that enabling the Spread Spectrum slows down the system slightly so I keep mine disabled..
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Old 5th June, 2002, 03:22 PM
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Thanks man.
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Old 5th June, 2002, 09:46 PM
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AFAIK, the "Spread Spectrum" option is for use if the PC is causing EMI interference with nearby electronic devices.
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Old 5th June, 2002, 10:13 PM
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Or as the good reaper says...

http://www.daocplace.com/index.php?article=spectrum
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Old 6th June, 2002, 12:53 AM
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Gee, I sure am glad my last name isn't misspelled at the end of that article or anything . . .
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Old 6th June, 2002, 01:01 AM
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Quote:
Originally posted by dimmreaper
Gee, I sure am glad my last name isn't misspelled at the end of that article or anything . . .
I just do what phiber tells me to

How's it spelled, dude?

EDIT: Never mind, I haven't written a script to edit existing articles yet, so you've just gained a new pseudonym!!!
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Old 6th June, 2002, 07:09 AM
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Lmao!!

good thread here
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Old 6th June, 2002, 04:22 PM
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Enabling Spread Spectrum (SS) in the BIOS, enables the master clock generator to generate an SS signal! Obvious really. (:

Some background: The problem relates to radiated RF from square waves. Square waves are nasty things in reality.

There's a theory that states that all waves can be made up of a number of sine waves(Fourier). If you take a square wave, and do a Fourier Transform on it, you'll see it's made up of many many sine waves. There is a sequence to it! It looks roughly like

sw(t)=sin(t)+(1/3)sin(3t)+(1/5)sin(5t)+(1/7)sin(7t)+...

and so on. If you took a square wave, you'd see the most of the power at the base frequency, 1/3 of the power at the base freq*3, 1/5 the power at the base freq*5, 1/7 of the power at the base freq*7. It keeps going for each odd harmonic, so at the base freq*101, it'd be 1/101 of the level.

Both Europe and America have some rules about the level of RF emissions that are allowable. These rules are getting tighter and tighter as time goes on. Producing a square wave makes a broad hash of RF interference (as you can see from the formula above!).

The spread spectrum modulation means that your clock gen is no longer running at exactly xxxMHz. The clock generator keeps shifting the frequency around, so that it doesn't sit in the same place. This has the effect that the RF generated by the square wave is now smeared out over an area of the RF spectrum. Smearing it over an area means that each individual frequency ends up with less power in it. This allows the components to meet the RF emission tests, as the power is spread over a range of frequencies, rather than the base frequency as before.

Depending on the clock generator on the motherboard, the AVERAGE frequency may be the same, less, or more than the selected frequency. On the whole, this is an improvement to the RF environment, so it should be enabled. Some clock generators can only generate a spread spectrum signal that averages slightly less than the selected frequency - on these boards, the performance will go down slightly. (Probably little enough that you'd have a hard time proving that it went down.)

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Old 6th June, 2002, 07:33 PM
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Quote:
What is "Spread Spectrum"
when the sun comes thru my kitchen window in the morning,



as i butter my toast,



i get a nifty "rainbow effect"....



from my "I Can't Believe It's Not Butter"



as the colors refract off my utensil.


and thus...



"Spread Spectrum"

:P
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