Help Needed - RX580 Hangs on Boot.
Moved to a separate thread -
Regards,
sfalatko
Moved to a separate thread -
Regards,
sfalatko
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MP 1,1-5,1 GPU Compatibility List for cMP
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Just picked up a 2010 Mac Pro 5,1 on trade for a 2011 iMac that I swapped to a k1000m running Ventura. The Mac Pro 5,1 had the 4 core w3530 and 4 x 1gb ram. Upgraded to 16gb ram I had lying around, a w3680 for $20 on eBay, and my Sapphire Nitro+ RX 5700 XT from my gaming PC. I did not do the Pixlas mod because under Windows on my gaming PC it says the card is limited to 220w. Max I've hit on benchmarks is 218w. Seems to run great on Monterey... On Ventura I lose bluetooth.
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How are you getting power to the GPU? I know the 5700xt does an 8 and a 6 pin.
Nice! I'm running almost the exact same setup, including 5700XT and Monterey. Very solid for me.
My 5700 XT has 2 x 8 pin, so I am using 2 separate mini 6 to 8 pin adapters from Amazon ($11 for the pair). From what I have read, the shutdown issues are most common with GPUs requiring one 6 pin and one 8 pin because of uneven loading on the connectors, where 2 x 8 pin distributes the load evenly.
I have. That fixes wifi and USB 1.1, but not Bluetooth. I have read the Bluetooth thread on here saying the same, so I assume the Bluetooth card is not patched properly. There is a mod to run the cable to an external USB port but I am fine with using Monterey.
Thats bad, you overload with 2x8 pin the backplane more of course as with 6 and 8
6 and 8 is close to the edge if balanced.
Why do you assume 8 and 8 is working better than 6 and 8.
8+8 are 300 Watts max looking at the pure specs
6+8 are 225 Watts max looking at the pure specs
the Backplane ports are rated for 2x75 Watts, 2x110 Watts until emergency shutdown.
this is the reason 6+8 works often if balanced.
not looking at peak loads in that math - those can trigger emergency shutdown as well.
Totally agree with @Macschrauber.
6 pin is 75w
8 pin is 150w
So in what world is 2x8 safe to connect to 2x6......🤪
6 pin is 75w
8 pin is 150w
So in what world is 2x8 safe to connect to 2x6......🤪
People does some weird rationalizations when doing something that they know that is wrong…
I've been doing a lot of reading and have found no proof the backplate is limited to 75w. These are also not standard 6 pin connectors. The 6 pin connectors on the Mac have power on 3 pins instead of 2 pins like a regular 6 pin, so they should safely deliver 150w each. The Mac has been shown to deliver up to 120w on one 6 pin connector.
120w +120w +75w = 315w.
As I stated, my card is BIOS locked to max out at 220w so I'm probably pulling closer to 90w on each 6 pin, and 40w on the pcie slot. And of course that would be at max load, which I have only hit on benchmarks testing and never under gaming loads.
Another macrumors forum stating the same:
Thread 'MAC PRO 4,1 and 5,1 PCIe AUX Power' https://forums.macrumors.com/threads/mac-pro-4-1-and-5-1-pcie-aux-power.2035519/
This is the electrical capacity of the connector/cables, not that the SMC will shutdown at that. Several people here tested this with lab equipment and the SMC emergency cut-off is somewhere around 110 to 120W, with temperature greatly influencing the SMC emergency shutdown.
Btw, with lab power loads the power draw is constant and fully resistive, which performs much more linearly than a switching power load like the GPU power circuits. With real GPUs the effective SMC cut-out should be less than when using a lab power load.
Capable of a surge of 110 to 120W, even with a PSU/backplane combo that is capable of 120W, with a sustained power draw of 119W the backplane PCB will crisp the power traces overtime.
Even if the PCIe slot can safely provide 75W, no modern high end GPU after the AMD RX 480 reference model motherboard melting fiasco have a PCIe power draw of more than ~45W, the worst one is the RTX 2080TI with 52W - the outlier. Just from this fact the assumptions are all wrong.
It's not because some people did not understand how GPU power planes work in the past that these very wrong assumptions should be take at face value. Things are even more complicated when you account for the switching spikes.
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A nice read:
Mac Pro Pixlas Mod, is it really needed?
I have been a vocal proponent of the Pixlas Mod. However I started doubting the claims my recommendation was based on and decided it was time to get to the bottom of this. Do I still recommend the Pixlas Mod after gathering all this information?
thehouseofmoth.com
Did you noticed that I was talking about high-end GPUs? There is also a RX 560 that is 66W.
A nice read:
Mac Pro Pixlas Mod, is it really needed?
I have been a vocal proponent of the Pixlas Mod. However I started doubting the claims my recommendation was based on and decided it was time to get to the bottom of this. Do I still recommend the Pixlas Mod after gathering all this information?
Dumb take, this is not taking into account the PCB traces or the SMD fuses, SMC emergency shutdown, amperage sensors, spikes or anything else besides the wires/connectors.
Maybe some day the whole circuit diagram leaks from the mothership and we can answer that.
Even if someone determined enough to delaminate the whole PCB to get real answers about all the power planes, like codejingle did with MacPro6,1, we still don't have the Renesas F2117TE20H H8S/2117V source code to know the sensor reading matrix that triggers a SMC emergency shutdown - it's not just amperage/voltage, but temperature.
Another thing, there is enough Mac Pros with damaged PCIe slots by the reference model RX 480 and the
Dell fake RX 580 that we already know that the limits are very near there.
RX 460 is 75W TDP but i wonder if it spikes higher. No i noticed you said ~45W.
Let's be clear of what I'm explaining here from the start, even if the slot provides safely 75W, you can't account that the GPU is drawing 75W from the PCIe slot when calculating the total power draw of the GPU. You have to go to an accredited review where it was correctly measured, like the reviews from tomshardware, and see the medium and maximum power draw from each of the different power inputs.
Most high-end GPUs that can be installed to a MacPro5,1, the object of this forum discussion, will draw ~45W from the PCIe slot, that's the point.
yes, that is expected. You need to patch the GPU's firmware
AMD Radeon RX 6800 XT / 6900 XT for macOS?
By design, the Mac Pro EFI BootROM uses UGA (an older standard) for screen output. Mac-compatible cards provide UGA, which lets you see the native boot picker and the early boot screens (before MacOS loads). Without a UGA-compatible card (i.e. with non-Mac/PC cards), you'll see a black screen...
forums.macrumors.com
Hi-
I tried running a GTX 780Ti (OG firmware) along side a GT 120 (OEM). Now the GT 120 (OEM) fan does not power up and there is no display even when its the only GPU.
My GT780Ti did boot into Mojave afterwards.
What do you think happened?
I tried running a GTX 780Ti (OG firmware) along side a GT 120 (OEM). Now the GT 120 (OEM) fan does not power up and there is no display even when its the only GPU.
My GT780Ti did boot into Mojave afterwards.
What do you think happened?
Hi Everyone,
What an amazing thread.
I have an issue with a Gigabyte Radeon RX560 install. From what I understand at the beginning of this thread, it should be compatible out of the box on a macpro 5.1. But I am getting only a black screen. I have tried endless different cables to no avail. When I put my original GT120 , the Dell display works so I guess it’s the card. My 5.1 is running on high sierra.
Any help would be hugely appreciated! Thank you!
What an amazing thread.
I have an issue with a Gigabyte Radeon RX560 install. From what I understand at the beginning of this thread, it should be compatible out of the box on a macpro 5.1. But I am getting only a black screen. I have tried endless different cables to no avail. When I put my original GT120 , the Dell display works so I guess it’s the card. My 5.1 is running on high sierra.
Any help would be hugely appreciated! Thank you!
Did you connect aux power pin (if any), the card most likely has a 6pin connector.
If you install both GT120 + RX560, can you see the RX560 in system info?
Is that High Sierra unpatched?
How long did you wait to confirm no display? (In general, you won't see the boot screen, which means the screen will stay black until your cMP boot to desktop)
Thanks for trying to help!
To answer your questions:
It doesn’t have Aux cables, it’s powered only through the card slot.
I didn’t try to install both cards at the same time so could try that?
How would I know if high sierra is unpatches? Sorry being a bit of a novice here ;-)
And yes, I waited , and waited and waited… lovely fab sounds but yep, no display!
To answer your questions:
It doesn’t have Aux cables, it’s powered only through the card slot.
I didn’t try to install both cards at the same time so could try that?
How would I know if high sierra is unpatches? Sorry being a bit of a novice here ;-)
And yes, I waited , and waited and waited… lovely fab sounds but yep, no display!