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The card must be drawing all it can from the single source and is able to boot, but when it is put under a load it is underperforming because it is underpowered.

The card doesn't know how it's powered, so it won't downclock itself (or use other means to safe power). If it draws more power than the cMP can provide, it'll shut down.
 
Pre-order price on Amazon UK for Sapphire RX 580 Pulse 8GB has just seen a big drop!
Now £221 (approx. €243). This hopefully means it will be shipping soon.
A note to all EU folks, Amazon UK, ES, FR and DE will all ship to anywhere in Europe for little to no cost.
If you're after this card and live in the EU then Amazon UK is your best bet right now.
https://www.amazon.co.uk/gp/aw/d/B071CQ5LRV
 
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Perhaps I've misunderstood here, but are you driving each 580 with a single mini 6 pin to 8 pin adapter?

Surely you should be using a dual mini 6 pin to 8 pin adapter for one card, and then be powering the second card through other means.
As I said, I may have misunderstood what you stated however. Please correct me if I'm wrong.


No, you haven't misunderstood anything! That's correct, I have been powering them from one single 6 pin each.
I did not know you needed dual 6pins to one 8pins. I must have missed this somehow in my prior "research" about the cMP and the 580's.

Thank you some much for pointing this out! I will order the correct cableadapters asap!
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The card from ASUS is not a problem. However, you connect a 8pin to a single 6pin is the problem. You should not do that on a cMP.

The correct cable to be used is the dual mini 6pin -> single 8pin.

Thank you all for pointing this out, I don't know how I missed this. But will order the correct cables asap!
 
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Pre-order price on Amazon UK for Sapphire RX 580 Pulse 8GB has just seen a big drop!
Now £221 (approx. €243). This hopefully means it will be shipping soon.
A note to all EU folks, Amazon UK, ES, FR and DE will all ship to anywhere in Europe for little to no cost.
If you're after this card and live in the EU then Amazon UK is your best bet right now.
https://www.amazon.co.uk/gp/aw/d/B071CQ5LRV
Only if this card shipped to the states! :rolleyes:
 
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Prices are gradually going back to MSRP for these cards. Be patient and you'll find one.
 
Can someone post the benchmark results of Cinebench in a Mac Pro 5,1 6 core with the AMD RX 580 pulse?
 
Can someone post the benchmark results of Cinebench in a Mac Pro 5,1 6 core with the AMD RX 580 pulse?

You better ignore this benchmark. Even though it's an OpenGL test, but it actually benchmark the CPU (but not GPU) in most case. The test process is too CPU single thread limiting. So. Unless you have a supper fast CPU + super slow GPU combination. It can't properly benchmark the GPU.

Basically, the CineBench OpenGL test is CPU single thread test. And the rendering test is the multi threads test. None of them can properly benchmark a normal workstation's GPU.
 
Great to see the rx580/polaris cards officially supported by Apple, thanks to the external GPU dev kit release. While we have DisplayPort working well, the HDMI 2.0 ports are still limited to a HDMI 1.4a / 300Mhz pixel clock.

Since there is "official" shipping hardware to the dev community, it's about time for Apple/AMD to finally unlock the full potential of HDMI2.0 port for Polaris cards. I've submitted a bug to Apple on this one, let's see if they take a bite.
 
I'm running a ASUS DUAL-RX460-O2G on slot one of a Mac Pro 3.1 running Sierra. It works right out of the box with dvi connected but Final Cut and Cinebench R15 crash pretty hard. Final Cut freeze's the whole system except mouse movement.

Cinebench R15 says the GFX board = AMD Radeon HD Baffin Prototype Open GL engine. When starting the OpenGL test, it runs for a couple of frame's and the software crashes.

Als Quicktime is really choppy.

Inside the system prefference's it says Graphics AMD R9 xxx 2048mb.

Any idea how to solve this?
 
Pre-order price on Amazon UK for Sapphire RX 580 Pulse 8GB has just seen a big drop!
Now £221 (approx. €243). This hopefully means it will be shipping soon.
A note to all EU folks, Amazon UK, ES, FR and DE will all ship to anywhere in Europe for little to no cost.
If you're after this card and live in the EU then Amazon UK is your best bet right now.
https://www.amazon.co.uk/gp/aw/d/B071CQ5LRV

Hey Squuiid, it seems like you have a lot of experience with this so far, I recently bought an Asus RX 550 hoping it would work with the rest of the 5xx generations line up and it doesn't. I've played around with replacing the 480/480 kext to the 550 kext with no luck. Do you have any help you can offer me, as to what kernel extensions/ graphics accelerators to edit or if the 550 would even work in my 2008 Mac Pro on High Sierra? (notice I'm using a patch to get onto high Sierra with my Mac Pro)

Another option would be returning it for a 560, I've heard it works. I just want to be sure if so.
 
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Hey Squuiid, it seems like you have a lot of experience with this so far, I recently bought an Asus RX 550 hoping it would work with the rest of the 5xx generations line up and it doesn't. I've played around with replacing the 480/480 kext to the 550 kext with no luck. Do you have any help you can offer me, as to what kernel extensions/ graphics accelerators to edit or if the 550 would even work in my 2008 Mac Pro on High Sierra? (notice I'm using a patch to get onto high Sierra with my Mac Pro)

Another option would be returning it for a 560, I've heard it works. I just want to be sure if so.
Honestly, return it for a 560.
 
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Well, kiss OOB support goodbye with High Sierra 10.13.2.

At least, if you want sleep to work properly. Apparently, only Sapphire RX 580 Pulse in 10.13.2 has sleep function working properly.

My RX460 which has been trouble-free up until 10.13.2 no longer has sleep working.

Sleep bug is... machine goes to sleep either user-initiated or automatically will not go to sleep... display is off, and LED power light on the Mac Pro will glow in and out like it is asleep, but, the thing is still on. Also, can't resume from sleep. So, I have to press and hold power button to turn it off and turn it back on, again.

This makes my cMP basically behave like a hackintosh! Doh!

This is not good news because if this is not fix, it means the marked up price of the already marked up Sapphire RX580 Pulse will get even more marked up.

Not fun.
 
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Ok, perfect, nice, thanks! And will both DisplayPorts work in a dual monitor setup (in 4K)?

They should able to work at the AMD and time.

For your info. If your 4k display only has HDMI input. You can use a DP to HDMI ACTIVE converter to display 4k 60Hz properly.
 
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Speaking of fans, its funny how humidity can effect things. Summer has started off HOT and beautiful here in New Zealand. Also the Tasman sea which I am next to is hotter then normal this summer. The humidity was really low though as it was nice blue skies with no clouds, comp was running nice and cool and quiet. Then the last couple of days its been really really cloudy and the humidity rose to 80%. My fans started ramping up and only went back down this morning when I opened up all the curtains and windows in the house.

mmmmmm joys of living on an Island, I need air conditioning.
 
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