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Well, the story goes on...

After the above, I purchased and installed the Aqua kryo M.2 adapter with a Samsung 970 EVO Plus 2TB. Did a clean install of High Sierra. Put my stuff on it. All works wonderfully well and Blackmagic Speed test tells me the Mac is now 3 times faster in reading/writing speed. I'm very happy with this.

Then I thought, why not try that Asus Radeon RX 560 4GB again so I took out the GT120 and installed the Asus. And much to my surprise it now works flawlessly! I mean, no stuttering of any kind in games, no spinning balls in Photoshop and not even stuttering audio.

How is this possible?
Can you make the same screenshot like before of the PCI device?
 
not even stuttering audio.

Nehalem dual-CPU audio stuttering only happens with Mojave and newer macOS releases, not with High Sierra.

Kinda weird it is running at x8 rather than x16 Bandwidth in slot 1?

Weird why? AMD RX 560 is a PCIe v3.0 x8 card.

Screen Shot 2023-04-20 at 20.09.33.png
 
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But isn't PCIE3.0 x8 equal to the same bandwidth as PCIE 2.0 x16?

What the bandwidth have to do with physical PCIe lanes? A RX 560 only have 8 PCIe lanes, System Information is showing the number of lanes the PCIe card is actually connected to, not the bandwidth.
 
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I have seen before RX-580 reporting 8 lanes there (because it was malfunctioning), but yes if this is an 8 lane card then it is fine.
 
Well, the story goes on...

After the above, I purchased and installed the Aqua kryo M.2 adapter with a Samsung 970 EVO Plus 2TB. Did a clean install of High Sierra. Put my stuff on it. All works wonderfully well and Blackmagic Speed test tells me the Mac is now 3 times faster in reading/writing speed. I'm very happy with this.

Then I thought, why not try that Asus Radeon RX 560 4GB again so I took out the GT120 and installed the Asus. And much to my surprise it now works flawlessly! I mean, no stuttering of any kind in games, no spinning balls in Photoshop and not even stuttering audio.

How is this possible?
so now you need to try this on mojave and see what happens...
 
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Schermafbeelding 2023-04-21 om 06.16.34.png


Also, what model PCIe card do you have installed in slot-4? Looking at the PCIe ID is an ASMedia ASM1062 SATA controller. Is a Sonnet Tempo SSD? Pro Plus?
 
A last update. The card started playing up again. Lightroom and Photoshop worked well, but it turned out I couldn't use Adobe Bridge and I could play some games but not others because of the screen just glitching and being totally distorted. I took a pic of that with my iPhone as it doesn't get recorded in screenshots. It's the same glitching I mentioned earlier on in the thread. It looks the same in some of my games.

IMG_3174.jpg

So I found a Sapphire Pulse RX 580 8GB for 90 dollars and it does seem the card to get. I've installed it and tested everything that wouldn't work with the Asus RX 560 card and everything just works as it should. Temps look good too.

I thought I would report this here as a warning that maybe that particular card is not such a good idea? Unless it was just a faulty card.
 
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I thought I would report this here as a warning that maybe that particular card is not such a good idea? Unless it was just a faulty card.

yup certainly looks like a faulty card. I have an MSI RX 460 and no issues with it with those Apps.
 
its only money, at least its not worse, money is made to spend or lose, but you are happy with the 580 and thats what counts. :):apple:😊
Yes, I am happy now. I have not seen anything wrong anywhere since installing the Sapphire. So I lost some money. There’s always that chance when you purchase something on eBay. Or anywhere else for that matter. But although I don’t particularly like to lose the money I paid for the Asus, I can afford it, so I can live with it.

Thanks very much, MrScratchHook for your support, help and advice. It is very much appreciated. 🙏
 
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I could have written this same post with the topic:

Problem, but is it Mojave or the Radeon RX VEGA FRONTIER EDITION, both newly installed?​

Of course my problem is sufficiently similar that i'm not going to start a new thread.

It seems it was solved by replacing the GPU.......... I'm a little troubled by this due to the cost (ebay purchase) of the VEGA FE but if it fixed everything it may be my only option.

It feels like a very similar problem but it's weird.

PCIe register shows the Radeon RX Vega FE 16GB. So..

(1) it has correctly identified the card [board_id] *BUT*
(2) System Info is lying to me - it says the GPU is connected at x16. This is impossible because it's in a x8 slot in my NETSTOR PCIe expansion box - a TRUE negotiated link speed would say x4 or x8.

This means the device description is hard-coded NOT calculated / 'evaluated'

Anyone able to diagnose the point in the system POST / boot process where the failure occurs?

IIRC.. the system queries (or 'evals') SATA, then xHCI, then PCIe but the behaviour of the display performs very much in line with the "unaccelerated" characterisation made by @tsialex in an earlier post.

Is this possible? The GT120 has the 'fallback' MAC EFI drivers to boot with 'unacceleraed' graphics? The VEGA FE doesn't have the fallback drivers does it?

Any thoughts/comments very welcome?

(In the mean time I will troubleshoot with a Radeon RX480 I have in storage)
 
(2) System Info is lying to me - it says the GPU is connected at x16. This is impossible because it's in a x8 slot in my NETSTOR PCIe expansion box - a TRUE negotiated link speed would say x4 or x8.

If the Netstor is PCIe v3.0, SystemInformation can will incorrectly get the downstream values, same happens with PCIe v3.0 blades and some PCIe v3.0 switches.
 
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