GPU and PCI bandwidth?

[Edgar R. Zakarian]

Hi my gpu is only running at 8x,

 

gpuz says the card reports that it supports 1.1 16x

 

anyone know why?

 

 

pc is in signature

[Levent]

click that little question mark next to that and check again. You need to load your gfx card calculate your bandwidth. This is without any load.

Spoiler

With that "?" putting some load on the gpu.

Spoiler

 

[Edgar R. Zakarian]

52 minutes ago, Levent said:

click that little question mark next to that and check again. You need to load your gfx card calculate your bandwidth. This is without any load.

  Reveal hidden contents

With that "?" putting some load on the gpu.

  Reveal hidden contents

 

 

Spoiler

 

 

 

tried it

[maazster]

The graphics card you have installed, is it a card that was built specifically for mining? Because if it is then it is only rated at PCI-e 1st gen standards. If not then there is something wrong with either the bios of the card or the drivers.

[Edgar R. Zakarian]

19 hours ago, maazster said:

The graphics card you have installed, is it a card that was built specifically for mining? Because if it is then it is only rated at PCI-e 1st gen standards. If not then there is something wrong with either the bios of the card or the drivers.

I'm starting to think you are right. 

Yeah it is for mining normally. 

The specs say pci 1.0 with no other info. 

So i guess pci 1.0 16x = 1.1 8x?

Darn. I've got the crappiest mining p106-100 ever made haha 

https://www.asus.com/Graphics-Cards/MINING-P106-6G/specifications/

 

Guess techpowerup was wrong. Says pci 3.0 16x. 

https://www.techpowerup.com/gpu-specs/asus-p106-100-mining.b4698

[maazster]

9 hours ago, Edgar R. Zakarian said:

I'm starting to think you are right. 

Yeah it is for mining normally. 

The specs say pci 1.0 with no other info. 

So i guess pci 1.0 16x = 1.1 8x?

Darn. I've got the crappiest mining p106-100 ever made haha 

https://www.asus.com/Graphics-Cards/MINING-P106-6G/specifications/

 

Guess techpowerup was wrong. Says pci 3.0 16x. 

https://www.techpowerup.com/gpu-specs/asus-p106-100-mining.b4698

It is most likely due to you having an APU, the APU provides only 8 lanes of PCI-e connectivity. If you have managed to get around the drivers and have got the card working to play games, verify the performance of the card. PCI-e 1 will bottleneck the card for games, though it isn't the card's intended use case.

[mariushm]

Yeah you have only 8 pci-e lanes, because the other 8 are used internally by the integrated graphics.

 

pci-e 1.0 is 250 MB/s for each pci-e lane , half of pci-e 2.0 .... so the video card runs as if installed in a pci-e 2.0 x4 slot.

You still get 4 GB/s but that can be limiting performance.

 

[TopHatProductions115]

@mariushm I think there is some confusion surrounding this. As stated here:

• https://www.techpowerup.com/241444/amd-ryzen-raven-ridge-comes-with-a-limited-pcie-interface

Quote

these chips feature just 8 PCI-Express gen 3.0 lanes for discrete graphics, besides 4 lanes dedicated as the chipset-bus, and 4 other lanes driving a 32 Gbps M.2 NVMe slot. What this means for the end-users, is that any discrete graphics cards plugged into the PCI-Express 3.0 x16 slot will run at half the bandwidth - PCI-Express 3.0 x8.

Iirc, the APU's built-in graphics are using Infinity Fabric, not PCI-e lanes. The hypothetical bottleneck, however, still remains.