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[gort]

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[Stormseeker9]

4 minutes ago, gort said:

I've heard B450 motherboards gonna support PCie 4.0, but does it apply to the x16 slot or to whole motherboard ? My main concern is the ultra m.2 PCie 3.0 x4 slot, will it become 4.0 x4 or stay 3.0 ? PCIe 3.0 x4 = 4GB/s, PCIe 4.0 x4 = 8GB/s, some headroom for upcoming NVMe drives...

Pretty sure it’s the new X570 chipset that is supporting 4.0 

[mariushm]

The pci-e lanes coming from the cpu will support pci-e 4.0 but it depends on the physical layout of the board and the board quality.

It's really critical that the distance between the pins of the cpu which have those pci-e lanes and the physical connector (pci-e slot ,m.2 connector) is below some threshold. If the distance is too long, the signals become too weak and the speed gets downgraded to pci-e 3.0

 

The chipset may or may not have to be aware of pci-e 4.0 in order for a m.2 device to communicate with the cpu at pci-e 4.0 speeds.

 

Either way, you shouldn't worry that much about it ... any m.2 ssd that supports pci-e 4.0 and actually exceed the pci-e 3.0 limitations will most likely be expensive and launch probably in the middle of next year or by the end of next year.

 

[gort]

15 minutes ago, mariushm said:

Either way, you shouldn't worry that much about it ... any m.2 ssd that supports pci-e 4.0 and actually exceed the pci-e 3.0 limitations will most likely be expensive and launch probably in the middle of next year or by the end of next year.

 

well... maybe sooner then that

 

https://www.tomshardware.com/news/ssd-pcie-4.0-phison-nvme,38418.html

 

Phison says the SSDs will hit the market in Q3 2019.

[DildorTheDecent]

56 minutes ago, gort said:

I've heard B450 motherboards gonna support PCie 4.0, but does it apply to the x16 slot or to whole motherboard

Motherboard manufacturer's will be able to update the UEFI on existing motherboards and provide partial PCIe 4.0 support whenever a Ryzen 3000 CPU is installed.

 

The first PCIe slot will provide 4.0 connectivity while the rest of the CPU-driven slots will remain at PCIe 3.0.

 

If you want proper PCIe 4.0 support, buy a 500 series motherboard.