Ryzen 8700G APU Spec Confirmation: ECC Memory Support (No!) and PCIe Lanes (No Bifurcation, they suck!)

Speaking of the Alder Lake series of chips (that includes its refreshes by the same or different name)… I was looking their their SKUs that were P-core-only. None of those have AVX-512 either despite the root reason for disablement being E-cores. It’s one of the more recent examples of an “anti-feature.”

Based on AMD specs page, 8700G support 2 USB4 40Gb ports natively. Can any one confirm if it works with any motherboard currently on the market?

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Find it. Gigabyte B650E Aorus Elite X AX ICE has USB4 support though Ryzen 8000 directly without 3rd party controller.

(Note) This USB Type-C® port supports a maximum speed of 40Gbps as a USB4 port when pairing the Ryzen 8000 series processors.

PS: It looks like x870e/x870 is just a temporary patch for USB4. In the future, the USB4 controller will be intergrated into CPU, just as Ryzen 8000. As Ryzen 9000 use the same IO die as Ryzen 7000s, to support USB4, it has to rely on 3rd party controller. A dedicated USB4 controller on board takes 4 pcie lines, it make x870e has less connectivity than x670e. As said, in the next gen after Ryzen 9000, AMD definitly will integrate the USB4 into CPU, x870e series will be outdated after one gen.

I am about to put a 8700G to an Asrock Desk Meet X600.
I read the posts and if I get it right the APU does not support ECC and bifurcation, right?
Or did I missed something?

I am planning to throw a

  • 10g NIC to the PCIE,
  • an m.2 ssd on the back of the mobo
  • a delock m.2 - u2 adapter on the slot on the face of the mobo
  • m.2 e key to 2 sata adatper

Can someone confirm whether all device will work, I mean is there enough pci lanes?

Thank you.

Seems to be enough lanes but not enough slots - unless you plan to use the E slot reserved for WiFi to instead house something else.

The Desk Meet X600 has the following:

  • PCIe 4.0x16 slot
  • m.2 5.0x4 slot, 2280M
  • m.2 4.0x4 slot, 2280M
  • m.2 4.0x2 slot, 2230E
  • m.2 e key to 2 sata adatper
    this is meant to occupy the E slot (wifi)

so good to go?

Should work in theory. I do not know if it is in practice - is the E port open to plug in whatever, or is it locked to specific WiFi modules?

Other than that, I see no issues then.

I have Trendnet TEG-10GECSFP (10 Gigabit PCIe SFP+ Network Adapter - TRENDnet TEG-10GECSFP) specifications says it is a 2.0 x4.
Can this work in the wifi m.2 slot with an Delock M.2 Key A+E to PCIe x4 NVMe Adapter (Delock Products 64218 Delock M.2 Key A+E to PCIe x4 NVMe Adapter angled with 20 cm cable) ? The A+E keys slot has 4.0 x2, however not 2 lanes, but 1+1. Is it still okay?

Unfortunately that depends on the motherboard’s BIOS, I have seen cases where you can remove the default OEM Wifi M.2 module and use these PCIe lanes for any device and I have also seen cases where the BIOS doesn’t initiliaze a device that’s not on the manufacturer’s BIOS-integrated “Allow List”.

I assume that the motherboard you intend to use already has a Wifi module installed in that M.2 A+E slot and isn’t empty by default?

I am planning with Asrock DeskMeet x600 https://www.asrock.com/nettop/AMD/DeskMeet%20X600%20Series/index.asp, got a full bios and comes with an empty A+E slot.

If it’s empty by default then I would be cautiously optimistic. To be sure I’d contact ASRock’s Tech Support to make sure they don’t do anything funny BIOS-wise, for example as mentioned only allowing certain white-listed PCIe devices/Wifi cards.

here is Asrock’s answer:

If the adapter’s pinout follows the spec, it is supposed to work on the M.2 Key E 2230 slot.
However, you will get only x1 PCIe lane from M.2 Key E 2230 slot due to the motherboard’s HW spec.

Now the questions is whether x1 pcie 4.0 is enough for the 10Gbit nic?

4.0 x1’s 1.97 GB/s, 10 GbE’s 1.2 GB/s. Not many NICs, though.

This is the nic 10 Gigabit PCIe SFP+ Network Adapter - TRENDnet TEG-10GECSFP, specifications says PCIe 2.0 x4 interface.
Should be ok?

If the TEG-10GECSFP supports x1, which TRENDnet doesn’t indicate in the datasheet, then 500 MB/s max.

damn.
if i get it right a sata adapter like this
m2sata
would also not be able to run 2 sata ssd’s with 2x550Mb/s?

Yeah, 5 Gb of 8b/10b, same as USB 3 gen 1. And real world I’d expect like 300-400 MB/s if x1’s supported, depending on the PHY’s architecture.

Correct. For two port SATA the most common PCIe bridges are

  • ASM1061: PCIe 2.0 x1 so likely ~200 MB/s max concurrent to two drives; fine for older 3.5s, won’t keep up with current 3.5s or 2.5 SSDs
  • ASM1062: PCIe 2.0 x2; likely ~400 MB/s max concurrent
  • JMB582: PCIe 3.0 x1; likely also ~400 MB/s max concurrent

Also, as shown, M.2 doesn’t support much of a heatsink for the bridge controller and 2230 SATA cards lack mechanical support for the connectors.

In general, an ASM1166 on 3.0 x2’s the preferred building block as it saturates at ~1.7 GB/s split up among the drives. I prefer the x4 PCIe cards but see also the ASM1166 M.2 thread.

The ASM1164’s also 3.0 x2 but much less commonly used than the ASM1166. Wouldn’t bother with the JMB585.

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