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The synchronous clock of PCI Express supports SSC (Spread-Spectrum Clocking).Does PCI Express Hard IP support synchronous SSC?

PCI Express

Yes.

Regarding the Cyclone IV GX device, it is described that the PCIe Hard IP supports synchronous SSC as shown in Table 1-14 on page 1-43 of the URL link below.
https://www.altera.co.jp/ja_JP/pdfs/literature/hb/cyclone-iv/cyiv-52001.pdf

Similarly, Arria II GX and Stratix IV GX devices also support synchronous SSC.
There is a description in the URL link below.
https://www.altera.co.jp/support/support-resources/knowledge-base/solutions/rd07152011_103.html

The SSC modulation frequency differs depending on the device, so be sure to check the Device Handbook.

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