Fore! PCI Express 4.0 finally lands on Earth

Somewhat later than expected, the Peripheral Component Interconnect Special Interest Group, or PCI-SIG, has finally gotten around to releasing the PCIe 4.0 specification, which describes the technical requirements for connecting devices through the PCI Express I/O bus in personal computers and servers. "The delivery of the …

[TrevorH]

El Reg left hand, meet right hand...

https://www.theregister.co.uk/2017/10/25/new_optane_disks_280gb_480gb/

[Charles 9]

Re: El Reg left hand, meet right hand...

Not so fast. Word is coming down that those drivers are PCIe 3.0 x4, not PCIe 4.0.

[Gordon 10]

am I the only one who

Had to look up what GT/s was?

Turns out it's 8 data bytes + 2 control bytes. So actual data transfer rates = GT/sx80% = GB/s

[Douchus McBagg]

Re: am I the only one who

that was as per pci-e v1 and v2.

part of the pci-e v3 spec was the move from an 8+2 signaling to a 128+2 scheme. cutting overhead from 20% to around 1%

so. pci-e v1 is 2.5Gb per lane, and pci-e v2 is 5Gb per lane on an 8+2 signaling

pci-e v3 is a more managable for the tech at the time 8Gb instead of the assumed 10Gb doubling, but makes up the supposed shortfall by cutting ~20% overhead.