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Guru3D.com » News » Intel Comet Lake-S CPUs and Z490 boards support PCI-E 4.0 (but it's not active)

Intel Comet Lake-S CPUs and Z490 boards support PCI-E 4.0 (but it's not active)

by Hilbert Hagedoorn on: 01/22/2020 12:21 PM | source: tomshardware | 42 comment(s)
Intel Comet Lake-S CPUs and Z490 boards support PCI-E 4.0 (but it's not active)

A new report on the web indicates that the upcoming Comet Lake-S processors (tenth generation of Intel Core for desktop) actually do support PCI Express 4.0, some Z490 motherboards are designed for it as well. However an issue prevents PCIe 4.0 to become usable, so the platform will support PCI-E 3.0 instead.

The reason behind this is presence of Jitter in the Z490 chipset signal, that causes instability in the data signal and that menas that specifications required for the PCI-Express 4.0 certification are simply not met. PCI-E 4.0 is working at very high frequencies, and that requires that the signal be completely clean.

 

 

Several manufacturers added external clock generators to eliminate this Jitter, however not everyone did, so Intel made the decision to not support PCI-E 4.0 on this new platform. 



Intel Comet Lake-S CPUs and Z490 boards support PCI-E 4.0 (but it's not active)




« Grab for free: All Half Life games · Intel Comet Lake-S CPUs and Z490 boards support PCI-E 4.0 (but it's not active) · MSI Creates new Radeon RX 5600 XT Gaming Z SKU due to performance firmware updates »

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sverek



Posts: 6097
Joined: 2011-01-02

#5753723 Posted on: 01/24/2020 03:13 AM
The new platform should have been PCIe 4.0 and it should have been coupled to a 10 core CPU, before that turned out to be unpractical because of high power usage.
Will the new platform even be different then the current platform after these changes?

This error will cost Intel millions of $ in lost revenue from sales, together with wasted money on development.
Big OEMs like Dell, Lenovo, HP and more, will also feel that there PCIe 4.0 design money was wasted and they would need to continue to pay a small extra cost (1$ guess) on every single motherboard made to comply with 4.0, instead of the more simple and cheaper 3.0.
There will also be setups that would no longer be possible now with the slower bus speed, like some SSDs, multiple GPUs and Raid controllers for small workstation use.
And?

TLD LARS
Senior Member



Posts: 179
Joined: 2017-03-01

#5753883 Posted on: 01/24/2020 03:14 PM
And?


Sorry, i am just frustrated about the possibility of needing a new socket to mount a rebranded 10900KF, that is a 9900KF glued onto a socket adapter to fit the new socket, that is a rebranded and binned 9900k.
All that without the hardware mitigations, because the new chips are not ready yet.

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