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12 Jan 2017 The PCI Express specification gives you the option of using a spread- spectrum clock (SSC). The main benefit of this option is the reduced risk 1 Jun 2015 Spread spectrum clocking is a technique used in electronics design to intentionally modulate the ideal position of the clock edge such that the resulting signal's spectrum is “spread”, around the ideal frequency of the clock. 3 Feb 2014 2 Nov 2009 Engineers needed a method to keep their devices from overstepping this limit, so they started using spread-spectrum clocking in their devices. In theory, spread-spectrum clocking means that the tone is varied so that the clock signal varies continuously around the desired frequency.What is spread-spectrum clocking (SSC) SSC, or Spread-Spectrum Clocking, is a frequency-modulation technique used in digital devices (especially in telecommunications) to reduce the electromagnetic interference (EMI) that electronic devices can generate.