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PCIe 4.0 wont be supported on B450, X470 and older chipsets

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Pre-X570 boards will not support PCIe Gen 4. There's no guarantee that older motherboards can reliably run the more stringent signaling requirements of Gen4, and we simply cannot have a mix of "yes, no, maybe" in the market for all the older motherboards. The potential for confusion is too high. When final BIOSes are released for 3rd Gen Ryzen (AGESA 1000+), Gen4 will not be an option anymore. We wish we could've enabled this backwards, but the risk is too great.

Robert Hallock, Ryzen product manager

via https://www.anandtech.com/show/14477/amd-confirms-pcie-4-not-coming-to-older-motherboards

 

PCIe 4.0 now NOT coming to older motherboards. 

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I'm not surprised this happened, it's to be expected. In fact, I would be more surprised if PCIe 4.0 wasn't disabled.


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I hope Asrock doesn't get the memo as usual


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We don't even really have any PCIe devices so this doesn't really change anything. People with the money to buy new PCIe 4.0 stuff probably have the money to buy a new motherboard too. I know my RX 580 is overkill for the games I play, so I'm in no hurry to upgrade just because of the label 🤷‍♂️


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1 hour ago, Dan Castellaneta said:

It's probably for the better, anyways: AM4 has enough PCI-E issues to begin with.

What issues? Dont think ive heard of this one

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Posted · Original PosterOP · Best Answer
Quote

Pre-X570 boards will not support PCIe Gen 4. There's no guarantee that older motherboards can reliably run the more stringent signaling requirements of Gen4, and we simply cannot have a mix of "yes, no, maybe" in the market for all the older motherboards. The potential for confusion is too high. When final BIOSes are released for 3rd Gen Ryzen (AGESA 1000+), Gen4 will not be an option anymore. We wish we could've enabled this backwards, but the risk is too great.

Robert Hallock, Ryzen product manager

via https://www.anandtech.com/show/14477/amd-confirms-pcie-4-not-coming-to-older-motherboards

 

PCIe 4.0 now NOT coming to older motherboards. 


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2 hours ago, Daniel Z. said:

I think the amount of people that will be affected by this is basically 0. I don’t know of a single GPU that can fully saturate a PCIe 3.0 16x connection. I’m pretty sure even 4x is enough.

I concur with your observation but i would like to add that with especially the last generation of games i have the feeling there are a still a lot of mysteries concerning data transfer and reported information.
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they could have it as an option still. they just need to put a disclaimer in the bios saying it's not guaranteed to work. 


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Doesnt matter.

 good board partners will still "unofficially" support 4.0, then we shall know who is pulling us back

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Just now, firelighter487 said:

they could have it as an option still. they just need to put a disclaimer in the bios saying it's not guaranteed to work. 

i think the original idea was to have the board vendors test the connection and enable the switch to those that "passes" o_o

(which is like another degree of uncertainty because i'd think backtesting things like these may cause vendors to pass a few that's barely stable just to say more of their boards work)

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1 minute ago, VegetableStu said:

i think the original idea was to have the board vendors test the connection and enable the switch to those that "passes" o_o

(which is like another degree of uncertainty because i'd think backtesting things like these may cause vendors to pass a few that's barely stable just to say more of their boards work)

that's why the disclaimer. that covers the potential instability. 


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1 hour ago, dgsddfgdfhgs said:

Doesnt matter.

 good board partners will still "unofficially" support 4.0, then we shall know who is pulling us back

In this case I don't think even board vendors can make it work. AMD controls the firmware for the CPU and the AGESA for the board. 

 

I doubt many are affected by the lack of a PCIE 4.0 slot or two anyway.

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will it bring back the trend for board makers to build a new a320 budget board for r3000 if all these new features are hardly achievable?

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Yeah when I heard that the older boards would support 4.0 was pretty surprised and that it would be impossible to do in the first place. Well it looks like they wont support it like I had figured from the start. 

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5 hours ago, Dan Castellaneta said:

It's probably for the better, anyways: AM4 has enough PCI-E issues to begin with.

Source?

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28 minutes ago, Brooksie359 said:

Yeah when I heard that the older boards would support 4.0 was pretty surprised and that it would be impossible to do in the first place. Well it looks like they wont support it like I had figured from the start. 

That was my thoughts, exactly.  I always suspected it would only be on the new boards, due to the distance limitation of PCIe 4.0.

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Not a big deal really, I didn't even expect it, it was all maybe anyway. 

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6 hours ago, ApolloFury said:

Faster storage?

Consumers don't utilize the speed of SATA III drives, much less NVMe.

 

6 hours ago, ApolloFury said:

Multiple drives in one PCI-E slot?

Already exists with current addon cards.


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"Users today may find a PCIe 4.0 option available in their pre-X570 motherboards. However, users should expect this option to be disabled when final retail BIOSes are released to implement full performance and stability for new 3rd Gen Ryzen processors.

As pre-X570 motherboards were not designed with PCIe 4.0 in mind, their designs may be incapable of running PCIe 4.0 signaling with the requisite stability and performance. To ensure a reliable and consistent experience in the field, PCIe 4.0 will not be an option ultimately available to pre-X570 motherboards. Users may continue with a beta BIOS if they desire, but performance and stability cannot be guaranteed. "

 

Just wondering if this is still relevant. Pretty sure you can still just use the beta BIOS, its just not going to have official BIOSes endorsed by AMD anymore.

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That's expected. No one should be surprised or upset about it. 


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Posted · Original PosterOP
1 minute ago, Jito463 said:

I wonder if someone will figure out a way to extract that portion of the code from the beta BIOS, and patch it into future releases?

A bios modder out there might be able to figure out a way, but just how many people will be desperate enough to do this for a chance at PCIe 4.0 on older mobos and not just get a new one? It isn't a "must have" feature outside some very niche cases.


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3 minutes ago, porina said:

A bios modder out there might be able to figure out a way, but just how many people will be desperate enough to do this for a chance at PCIe 4.0 on older mobos and not just get a new one? It isn't a "must have" feature outside some very niche cases.

For me, it's less about the cost of the board and more about the hassle of swapping it out, reinstalling drivers (assuming a fresh install isn't needed), reactivating Windows, etc.  And given that I've got a pretty high end board, I'm confident that it could handle it.  Admittedly though, I don't really foresee a need for it.  It's more that it would be a nice feature to have.

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