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Movjave RX580 8.0GT/s

DearthnVader

DearthnVader

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Original poster
Dec 17, 2015
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Red Springs, NC
Seems running Movjave in Qemu gets proper link speed with PCI Passthrough on my RX580.

In High Sierra it only reported 2.5GT/s.

I'd be interested to know how others are fairing in Movjave Beta with their RX580's on real Mac Pro's.
 
DearthnVader said:
Seems running Movjave in Qemu gets proper link speed with PCI Passthrough on my RX580.

In High Sierra it only reported 2.5GT/s.

I'd be interested to know how others are fairing in Movjave Beta with their RX580's on real Mac Pro's.
Click to expand...
8.0gt/s? I thought pci 2.0 was limited to 5.0gt/s.
 
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DearthnVader this form is for Mac Pro's, not Hackintoshes.

The link speed of video cards has everything to do with the firmware at startup and nothing to do with the operating system.

If you could spend 2 minutes with the search button or check what is otherwise the top post in this forum rather than making a post about totally unrelated hardware, you would find your answer.
 
eksu said:
DearthnVader this form is for Mac Pro's, not Hackintoshes.

The link speed of video cards has everything to do with the firmware at startup and nothing to do with the operating system.

If you could spend 2 minutes with the search button or check what is otherwise the top post in this forum rather than making a post about totally unrelated hardware, you would find your answer.
Click to expand...

Not true, a 100% unmodified Nvidia reference GTX 1080 will negotiate at PCIe 2.0 (Link speed 5GT/s) in macOS 10.13.6 with 0089.B00 firmware when web driver is installed and correctly activated.

But the same card, same cMP, same firmware, will only allow the card to run at PCIe 1.0 (2.5GT/s) in Windows.

If only firmware can make the difference, then why this can happen?
 
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eksu said:
DearthnVader this form is for Mac Pro's, not Hackintoshes.

The link speed of video cards has everything to do with the firmware at startup and nothing to do with the operating system.

If you could spend 2 minutes with the search button or check what is otherwise the top post in this forum rather than making a post about totally unrelated hardware, you would find your answer.
Click to expand...

Thanks for the MOD note, but last I checked you weren't a moderator here, the mods can move or trash my post if they like.

Anyway I was asking real Mac Pro users what link speed they were seeing, because as I said, in HS I only see 2.5GT/s on the same "hardware" and firmware.

I'm pretty sure the drivers can enable higher link speeds.

Sadly I can't test my card in my MP3,1 because of the lack of SSE4.2 support.
 
h9826790 said:
Not true, a 100% unmodified Nvidia reference GTX 1080 will negotiate at PCIe 2.0 (Link speed 5GT/s) in macOS 10.13.6 with 0089.B00 firmware when web driver is installed and correctly activated.
Click to expand...
A 970 only negotiates 2.5GT/s in this environment. I don't have the appropriate power adapters to verify this in a Mac Pro with a 1080, but I don't believe your statement is accurate.
 
chrfr said:
A 970 only negotiates 2.5GT/s in this environment. I don't have the appropriate power adapters to verify this in a Mac Pro with a 1080, but I don't believe your statement is accurate.
Click to expand...

Your 970 is running at 5GT/s in macOS. You can run CL!ng (or CUDA-Z etc) to confirm that.

The link speed in system info is not the actual negotiating speed. The card’s link speed is dynamically adjusted depends on loading.

It’s been like that for quite a few years already.
 
h9826790 said:
Your 970 is running at 5GT/s in macOS. You can run CL!ng (or CUDA-Z etc) to confirm that.

The link speed in system info is not the actual negotiating speed. The card’s link speed is dynamically adjusted depends on loading.

It’s been like that for quite a few years already.
Click to expand...

I think the nVidia cards dramatically reduce link speed as part of the power stack.

EDIT: Sorry, you already said that.
 
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How do I check this speed, and what does it mean?
Do I need iStat or something, can’t see this figure in sytem info?
 
MarkC426 said:
How do I check this speed, and what does it mean?
Do I need iStat or something, can’t see this figure in sytem info?
Click to expand...

Download a free apps called “CL!ng” from Apple AppStore. That apps can measure the link speed in real time.

TBH, it should means almost nothing for most users (as long as your GPU is installed in a x16 slot).
 
Ah, will have to boot into HS to check, currently on Sierra and PCI info doesn’t show......:)
 
^^^^PCI info does show in Sierra, it's been a part of the OS in System Report for as long as I can remember in OS X.

Lou
 
^^^^
Unknown.png Hmm, now that I think about it, I seem to remember something like that years ago. Thanks for setting me straight.

Lou
 
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