AMD was the first company to support the PCIe 4.0 protocol in its processors and accompanying motherboards. However, according to the latest information coming from the recent Gigabyte hack that already produced a plethora of new information, AMD will not bring support for PCIe 5.0 to its forthcoming socket AM5 motherboards, at least not initially.
According to TechPowerUp, which got ahold of Gigabyte's leaked documents, AMD decided to stay off the PCIe 5.0 wave with its upcoming AM5 CPU socket designed for its codenamed 'Raphael' processors.
The diagram below shows that AMD has given socket AM5 as many as 28 PCIe lanes. And those lanes run the PCIe 4.0 version protocol, which is the standard protocol today. Out of 28 lanes, 16 are devoted to the PCI express slot for graphics expansion, four for an M.2 SSD, four lanes for SATA expansion, and the remaining four for chipset communication with the socket.
The surprising bit is that AMD is falling behind Intel in the interconnect space. At yesterday's Intel architecture day, the company revealed that the upcoming Alder Lake series of processors will deliver PCIe 5.0 connectivity. Expected to be a competing product with AMD's Raphael, it will certainly boast a newer communication standard for higher-speed communication between PCIe devices.
That, of course, doesn't mean that Intel will force its OEMs to integrate PCIe 5.0 standard. Just because the chip is capable of supporting PCIe 5.0, doesn't mean that the motherboard is as well. The newer Gen5 protocol will require thicker boards for better wiring and more retimers/redrivers in order to carry the speed, so it is possible that the Gen5 protocol will be reserved for some higher-end products like the Z-level chipsets from Intel.
It is an interesting time to see how AMD and Intel play out the whole situation, and it will be interesting to learn why AMD opted to only support PCIe 4.0. The EPYC Genoa lineup does support the Gen5 standard, so it's curious that it appears to be segregating PC and enterprise users with I/O connectivity options. We can expect to hear more about it once AMD Raphael processors launch.
Other than that, PCIe 5.0 isn't going to be utilitized properly during this generation or anywhere in the near future.
Graphics cards aren't going to saturate it.
Only the Top End Storage might potentially saturate it.
But that's reserved for the absolutely best NVMe drives only, most consumers can't afford it.
AMD is also the type to release different specs to different companies early on to identify the source of leaks. Picture one set of specs given to one company and another to another company. Any leaks would identify which company the leak came from. Since AMD has not given ANY timeline for new products at this point, we may be seeing some AMD strategy here as well...set Intel and NVIDIA up to put out official specs for new products, wait for them, and then release and adjust its own offerings.
On the consumer end, it's going to be PCIe as PHY connection for the MoBo's we buy.
That isn't going to change anytime soon.
The thing is, I actually agree with ddcservices. In such an architecture mobo, PCIe can be just one of the endpoints of IF, situated close to PCIe slots themselves, and providing as much PCIe x.y lanes as the slot itself needs.
I'm sure AM5 is being designed for many years of use, just like AM4. So you would think that it would make sense to have built-in support from the beginning. I know that it would be a factor in purchasing for myself, even if I'm not currently using it. If there is something that might be able to use it, whether GPU/storage/whatever, I'd rather have the support already there instead of having to buy another board.
good vid. if links are not aloud the name of the channel is Moore's Law Is Dead, its his last video.