Puzzled? e.g., TR 16c=pcie3 64 lanes, Epyc 32c = 128 lanes, so Ryzen should have 32 lanes, but only has 20 usable and 4 for the chipset. Where are the lost 8 lanes? Is amd saving them for the apu graphics?

I've thought about this very thing, but there are some distinct differences that may explain this: * To my recollection, both TR and Epyc utilize socket TR4, while Ryzen is AM4. * Only AM4 will support an IGP. * I don't think the X390 or X399 chipsets (the chipsets used for socket TR4) offer any PCIe lanes, meanwhile, The X370 and lower do. I believe this is where the "lost 8 lanes" come from. Also, the APUs only offer x8 PCIe 3.0 lanes, so you actually get even less compared to Ryzen. A little disappointing, but I don't know why anyone would buy an AM4 APU and buy a discrete GPU that can't be crossfired with the IGP (in which case x8 lanes is PLENTY).