Desktops are two channels of 64 bits, or with DDR5 now four (sub)channels of 32 bits; either way, mainstream desktop platforms have had a total bus width of 128 bits for decades. 8x64 bit channels is only available from server platforms. (Some high-end GPUs have used 512-bit bus widths, and Apple's Max level of processors, but those are with memory types where the individual channels are typically 16 bits.)