No bifurcation support means that there is no ability to split these lanes down any further, or to combine the 4.0 links into an 8x link. It is unknown exactly what series of processors ADL-P is referring to here, although it is believed - due to the core configurations also leaked by Coreboot - that they are likely to be laptop-based CPUs with more 'little' cores than 'big' cores, as well as two GPU 'cores' (as opposed to the single GPU core listed for ADL-S CPUs.) Two 4-lane (x4) port supporting PCIE gen 4.0 or below'Īlso for the PCIE5 port: 'Support is also provided for narrow width and use devices with lower number of lanes (that is, usage on x4 configuration), however further bifurcation is not supported'Īnd for the PCIE4 ports only support 1x4 and 1x4 reversed, so no way to get bifurcation to support x8 on those ports I think.One 8-lane (x8) port supporting PCIE to gen 5.0 or below.'The ADL-P processor PCI Express* has two interfaces:
