According to PCI, the Z690 chipset diagram confirms that 1×16 or 2×8 lanes of PCIe Gen5 will be attached directly to the CPU, whereas the chipset will support up to 12x PCIe Gen4 lanes and up to 16x PCIe Gen3 lanes.
The 12th Gen Core CPU will either support DDR5 or DDR4 memory in the dual-channel configuration, with DDR5-4800 and DDR4-3200 support. The site claims that the DDR5 memory will support Gear 2 (by default) or Gear 4 settings, which means that the controller will be working at 1/2 or 1/4 of the data rate to ensure compatibility and memory overclocking support.
The DMI (Direct Media Interface) will once again be upgraded. The current 11th Gen Core series already introduced DMI 3.0 with 8 lanes, whereas the Z690 chipset will be upgraded to PCI Gen4 x8 speed.
As already rumored before, Intel Alder Lake-S and Z690 motherboards will be released on November 17th, 2021.