220.127.116.11. TX PLL Restrictions when Using PCIe*
Intel® recommends driving the remaining channels of the L-tile by ATX PLL if 4 or more channels of PCIe* are used at Gen2 or Gen3 speeds. Using ATX PLL to drive these channels helps achieve better performance. Intel® Quartus® Prime issues a critical warning if fPLL is used to drive the remaining channels.
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