PCIe x 4.0 on Radeon VII

jesdals · Aug 12, 2019

I just noticed that my Radeon VII runs PCIe x 4.0 on my x570 chipset, in bios my board a Gigabyte Aorus Master is set at auto. The settings is shown in AMD driver overview

CPU is the X3800

OS win 10 pro 1903

Any one else noticed that?

GPU Z shows it as PCIe x 3.0

and so do HWinfo64? Strange?

frank30fps · Aug 14, 2019

dude it's called pci express 4.0, plus it says x16 on your gpu-z screen shot

TheoneandonlyMrK · Aug 14, 2019

frank30fps said:
dude it's called pci express 4.0, plus it says x16 on your gpu-z screen shot

His point is Amd software says 4.0.
Everything else is saying he's at 3.0.
Radeon VII is not supposed to support pciex 4?

Wavetrex · Aug 14, 2019

System Supported vs Active

Same thing happens when putting an old 2.0 videocard into a 3.0 system... it says that 3.0 is supported but 2.0 is currently active.

/thread.

p.s. - and no, Vega doesn't know 4.0...

ryannathans · Sep 2, 2019

I have a 3rd gen i7 (3770k) and my Radeon VII is now also reporting PCIe 4.0 support. It's therefore definitely not the "system supported" version as Wavetrex suggests. Maybe they've just switched it on?

btarunr · Sep 2, 2019

theoneandonlymrk said:
His point is Amd software says 4.0.
Everything else is saying he's at 3.0.
Radeon VII is not supposed to support pciex 4?

"Vega 20" technically supports PCIe gen 4.0, on its Radeon Pro and Instinct products, but AMD capped PCIe to gen 3.0 on Radeon VII. Maybe it did a shoddy job capping PCIe on some cards. All RVII cards are MBA.

ryannathans · Sep 2, 2019

btarunr said:
"Vega 20" technically supports PCIe gen 4.0, on its Radeon Pro and Instinct products, but AMD capped PCIe to gen 3.0 on Radeon VII. Maybe it did a shoddy job capping PCIe on some cards. All RVII cards are MBA.

MBA?

Chomiq · Sep 2, 2019

ryannathans said:
MBA?

Made By AMD

Flaky · Sep 2, 2019

Do a bandwidth speed test and you'll know for sure

Taking proper precautions of course, what if one would flash this card's VBIOS with Pro's version, which does support 4.0? It may be a restriction done purely in vbios.

ryannathans · Sep 2, 2019

Flaky said:
Do a bandwidth speed test and you'll know for sure

Taking proper precautions of course, what if one would flash this card's VBIOS with Pro's version, which does support 4.0? It may be a restriction done purely in vbios.

Planning an upgrade to Ryzen 3000 next month so I'll try a bandwidth test then.

I flashed the UEFI bios that has since been taken down by AMD. Maybe they accidentally unlocked it?

Recus · Sep 2, 2019

Run 3DMark PCI Express test.

btarunr · Sep 2, 2019

Okay, so we tested Radeon VII on an X570 motherboard and the latest driver. WattMan indeed reports PCIe mode as gen 4.0.

However, the speed doesn't physically apply. 3DMark PCIe test numbers are 14.26 GB/s for gen 4.0 and 14.27 GB/s for gen 3.0 (no change).

So it's probably a driver bug. PCIe gen 4.0 support is physically "fused" on Radeon VII. Radeon Instinct and Radeon Pro cards based on this chip support gen 4.0.

Vlada011 · Sep 2, 2019

PCI-E 4.0 is not important for graphic card performance at the moment.
But it's serious advantage compare to Intel for performance of OS, write, read and copy with new Gen 4.0 NVMe M.2.

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PCIe x 4.0 on Radeon VII

jesdals

frank30fps

TheoneandonlyMrK

Wavetrex

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