novaBBS - comp.arch - Re: MEG-X670E-GODLIKE lighting gen 5, claims to reach 128 GB/sec, how is that possible ?

Re: MEG-X670E-GODLIKE lighting gen 5, claims to reach 128 GB/sec, how is that possible ?

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Subject: Re: MEG-X670E-GODLIKE lighting gen 5, claims to reach 128 GB/sec, how
is that possible ?
From: MitchAl...@aol.com (MitchAlsup)
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by: MitchAlsup - Thu, 1 Sep 2022 16:44 UTC

On Thursday, September 1, 2022 at 9:06:19 AM UTC-5, Skybuck Flying wrote:
> The information website about: MEG-X670E-GODLIKE AM5 socket motherboard claims to reach 128 gigabyte/sec for what they call lighting PCIe 5.0 ?!
>
> https://www.msi.com/Motherboard/MEG-X670E-GODLIKE
>
> How is this possible since PCIe 5.0 only reaches 64 GB/sec according to wikipedia ?
<
64 GigaBits per second per 4-wires {2-in, 2-out} in True-Complement format.
<
All it takes is wires.
>
> https://en.wikipedia.org/wiki/PCI_Express
>
> So is one of them wrong ?
>
> Or is this something special ?
>
> Bye,
> Skybuck.

Re: MEG-X670E-GODLIKE lighting gen 5, claims to reach 128 GB/sec, how is that possible ?

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From: theom+n...@chiark.greenend.org.uk (Theo)
Newsgroups: comp.arch
Subject: Re: MEG-X670E-GODLIKE lighting gen 5, claims to reach 128 GB/sec, how is that possible ?
Date: 04 Sep 2022 11:31:21 +0100 (BST)
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by: Theo - Sun, 4 Sep 2022 10:31 UTC

MitchAlsup <MitchAlsup@aol.com> wrote:
> On Thursday, September 1, 2022 at 9:06:19 AM UTC-5, Skybuck Flying wrote:
> > The information website about: MEG-X670E-GODLIKE AM5 socket motherboard claims to reach 128 gigabyte/sec for what they call lighting PCIe 5.0 ?!
> >
> > https://www.msi.com/Motherboard/MEG-X670E-GODLIKE
> >
> > How is this possible since PCIe 5.0 only reaches 64 GB/sec according to wikipedia ?
> <
> 64 GigaBits per second per 4-wires {2-in, 2-out} in True-Complement format.
> <
> All it takes is wires.

They're cheating:

"LIGHTNING GEN 5

The latest and the fastest PCI-e data transfer solution can reach 128GB/s of
unidirectional transfer bandwidth of a x16 interface that has doubled
compared to its previous generation."

PCIe Gen 5 is 32Gbps per lane (aka 32GT/s). 16 lanes gives you 32*16 = 512
Gbps = 64Gbyte/s each way.

That doesn't get you to 128GByte/s, but if marketing add the TX and RX
bandwidth together they get to 128GB/s. You can't actually transfer
anything at 128GB/s (unlike, say, USB-C/Thunderbolt where you can decide to
have more TX bandwidth for displays by changing RX lanes to TX lanes).

Theo

"All these black people are screwing up my democracy." - Ian Smith

devel / comp.arch / Re: MEG-X670E-GODLIKE lighting gen 5, claims to reach 128 GB/sec, how is that possible ?

Subject	Author
Re: MEG-X670E-GODLIKE lighting gen 5, claims to reach 128 GB/sec, how	MitchAlsup
Re: MEG-X670E-GODLIKE lighting gen 5, claims to reach 128 GB/sec, how is that po	Theo