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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 i5 and i3 spotted, both get HyperThreading but lower clock speeds - 12/28/2019 10:11 AM
Some info on Intels' pending Comet Lake processors has surfaced. The 14nm node fabricated processors are assumed to launch in April. Earlier on it was kind of confirmed that the lower positioned pro...
Intel Core i9-10900K 10-core Processor and Z490 Chipset Rumored to be released April 2020 - 12/10/2019 09:36 AM
Intel Generation 10 Comet Lake processors, based on Intel's 14nm process and an underlying microarchitecture that is Skylake is next year's desktop processor series from Intel. It makes a step towar...
ASUS to release X299 BIOS Updates for Intel Core i9-10980XE, 10940X, 10920X and 10900X - 12/02/2019 09:26 AM
Much like MSI, ASUS as well will be releasing new firmware updates soon for their X299 motherboards, specifically for Intel Core i9-10980XE, 10940X, 10920X and 10900X, and an effort to make them over...
Review: Intel Core i9 9900KS Special edition processor - all cores at 5 GHz - 11/15/2019 01:34 PM
Intel has released its flagship desktop processor in the non-HEDT segment. The 9900KS is their most premium Coffee Lake-S eight-core processor that has been discussed so abundantly. This little beast ...
Intel Core i9-10980XE Cascade Lake-X Benchmarks - 10/25/2019 02:30 PM
The way Intel distributed samples on processors to media remains a mystery, however over in Romania the first review on the Core i9-10980XE, surfaced. It's written by our colleage Tudo who tested Ca...
squalles
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Senior Member
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#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
Ok, maybe in 2028 we can see any improvement using pci expresd 4.0 over 3.0 on new top high end videocard
asturur
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Senior Member
Posts: 749
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 )
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
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Senior Member
Posts: 1941
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.
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
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Joined: 2018-03-21
Senior Member
Posts: 6890
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.
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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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...) .