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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 01:21 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)




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rl66
Senior Member



Posts: 3432
Joined: 2007-05-31

#5753160 Posted on: 01/22/2020 01:46 PM
well the signal wasn't completely clean in Zen 2 so i don't see the excuse flying here.

though not surprised intel can't get a first generation gen 4 controller right, they couldn't with gen 3.
Nope the problem with Zen2 cpu is chipset dependent, it's for this reason that it is possible on some 3** and 4** chipset but deactivated (also it's an argument to sell more X570 too).

I hope for Intel that they will fix it with another chipset and a new socket (1201? good idea isn't it? maybe i am trolling a bit...) .

squalles
Senior Member



Posts: 919
Joined: 2003-06-10

#5753162 Posted on: 01/22/2020 01:51 PM
Ok, maybe in 2028 we can see any improvement using pci expresd 4.0 over 3.0 on new top high end videocard

asturur
Senior Member



Posts: 1219
Joined: 2010-05-12

#5753169 Posted on: 01/22/2020 02:06 PM
Is not about videocards, but about lines availability.
If pciEx4 is double fast than 3, i can use 8 line instead of 16 on a pci express 4.0 video card, get the performance of 3.0 at 16x. Use the free 8 lines for something else ( another nvme for example, a fast one )

Kaarme
Senior Member



Posts: 2978
Joined: 2013-03-10

#5753179 Posted on: 01/22/2020 02:37 PM
Haha, this is ridiculous. Though in a sense understandable because apparently ASMedia failed at making a chipset for Zen2, and thus we still haven't got anything but the partially flawed X570 (a variation of the CPU io chip itself). Seems like Intel's billion dollars R&D had no better luck.

Astyanax
Senior Member



Posts: 13635
Joined: 2018-03-21

#5753182 Posted on: 01/22/2020 02:47 PM
Nope the problem with Zen2 cpu is chipset dependent, it's for this reason that it is possible on some 3** and 4** chipset but deactivated (also it's an argument to sell more X570 too).

I hope for Intel that they will fix it with another chipset and a new socket (1201? good idea isn't it? maybe i am trolling a bit...) .

im sorry but you don't have any idea what im talking about.

it has nothing to do with chipsets, the gen 4 controller in zen 2 experiences unusual noise related errors and rather than admit a problem and tell people they may have to drop back to gen 3 properly, they dialed back the smu logging and covered it up.

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