How to make Link speed 2.5GT/s to 5.0GT/s on ATI card and Nvidia card

[itdk92]

That's a known macOS bug, not a Nvidia bug. System reports is a part of the OS, made by Apple, not Nvidia.

I just show you the test, run OpenCL Oceanwave. If you have 5GT/s, you should see ~5GB/s.

Can’t download OceanWave anywhere, and the new Compubench crashes on the ocean scene ( running on the 10.13.4 beta)

Do you have it?

 

[h9826790]

Can’t download OceanWave anywhere, and the new Compubench crashes on the ocean scene ( running on the 10.13.4 beta)

Do you have it?

This new apps can also test the bandwidth. It's from Apple Appstore and free. Safe to use.

https://itunes.apple.com/hk/app/cl-ing/id1244392031?l=en&mt=12

1) Open the apps
2) Go to Performance tab
3) Select your GPU at the bottom (choose OCL option)
4) Run one of the Compute test (e.g. Single Precision Scalar)
5) Observe the Memory bandwidth test result

If it's 5GT/s, the number should be around ~5000MB/s (as per the following screen capture)

 

[krakman]

This new apps can also test the bandwidth. It's from Apple Appstore and free. Safe to use.

https://itunes.apple.com/hk/app/cl-ing/id1244392031?l=en&mt=12

1) Open the apps
2) Go to Performance tab
3) Select your GPU at the bottom (choose OCL option)
4) Run one of the Compute test
5) Observe the Memory bandwidth test result

If it's 5GT/s, the number should be around ~5000MB/s (as per the following screen capture)
View attachment 754804

I dont think this software reports correctly.....

 

[h9826790]

I dont think this software reports correctly.....

Why?

Without running benchmarks, the bandwidth will stay at ~2500MB/s. That's normal, because the negotiation speed is dynamic. But once start to stress the card, the number will jump to ~5000MB/s. That looks perfectly correct to me.

 

[Raunien]

How much of a difference is it if my Rx 580 runs at 2.5 GT/s vs 5 GT/s? Is there any way for a Rx 580 to run at 5 GT/s?

 

[krakman]

Why?

Without running benchmarks, the bandwidth will stay at ~2500MB/s. That's normal, because the negotiation speed is dynamic. But once start to stress the card, the number will jump to ~5000MB/s. That looks perfectly correct to me.

Sorry my mistake I was looking at "device to device" speed

 

[rawweb]

This new apps can also test the bandwidth. It's from Apple Appstore and free. Safe to use.

https://itunes.apple.com/hk/app/cl-ing/id1244392031?l=en&mt=12

1) Open the apps
2) Go to Performance tab
3) Select your GPU at the bottom (choose OCL option)
4) Run one of the Compute test
5) Observe the Memory bandwidth test result

If it's 5GT/s, the number should be around ~5000MB/s (as per the following screen capture)
View attachment 754804

I wish the apple kext for the AMD side would perform whatever voodoo the NVIDIA web driver does to switch on 5 GT/s

 

[itdk92]

I wish the apple kext for the AMD side would perform whatever voodoo the NVIDIA web driver does to switch on 5 GT/s

View attachment 754846

Yes. I confirm that VEGA seems to run at pcie 1, too

 

[failcl]

HELLO

My Name is Sam , I have Sapphire R9 280X Display Card

I Flashed the rom !!! Now have mac boot screen, But only have pci-e 1.1 speed (2.5 GT/s)
I know need to remove the r17 !!! but i don't how to remove it !!!
Who can help me !!!
Many Thanks !!!

 

[The Spirit]

Hi.
Is there also a resistor mode available for the HD7870?

 

[RetroDan]

Hi.
Is there also a resistor mode available for the HD7870?

I'm still waiting for the RX 580 Resistor mod...

 

[RetroDan]

Strange to think that the resistor mod is now completely unnecessary, thanks to the official Apple firmware update. 138.0.0.0.0 fully enables 5GT/s speed for the RX 580. Best thing Apple has done in years.