Есть 2 состояния : Enabled/Disabled...по-умолчанию: Disabled. Может кто-то знает для чего она нужна ?
Спасибо за ответы...

опция - для повышения стабильности работы _некоторых_ старых карт

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Spread Spectrum

Options: Enable/Disable

This compromises system stability by performing frequency modulation on the system clock. Timing critical devices, such as NICs and SCSI may have problems. It's there to reduce EMI problems by making sure the system isn't using any one frequency for too long. Disable it. On a 1GHz system, 0.25% will result in a 2.5MHz fluctuation in CPU core frequency. Not nice. Always, always, always disable this when overclocking. If you have the Smart setting, the system will shut off the clock to unused slots, so use this if you have it.

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Spread spectrum (modulation)

Set this to disabled. This has to do with EMC (Electro-Magnetic Compatibility) testing. As a result you shouldn't need to enable it at all. Unless, you get intereference as a result. This is similar to radio signals affecting unshielded speakers. Setting this to enabled varies the bus speed a little so that system doesn't emit intereference at the same frequency. This affects performance however.

Эсли гониш проц по шине Spread Spectrum Modulated должен стоять в положении Disabled. А вообще такая тема уже была. В поиск надо.

Эсли гониш проц по шине Spread Spectrum Modulated должен стоять в положении Disabled-ВСЕГДА!
ДА,это для повышения стабильности устройств,т.к. электро-магнитные колебания наводят помехи.