Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

Sandleford

macrumors member
Original poster
Sep 15, 2008
85
3
When playing some windows games, will just flat turn off the machine and power button does not work untill unplugging the machine.

Just curious what the explanation is besides its old and is not really a windows machine.
 
You may overload the PCIe GPU power connectors. More than about 110 Watts per connector and the power protection shuts down the machine hard.

what GPU exactly and how do you power it?
 
  • Like
Reactions: Jhonjhon236
You may overload the PCIe GPU power connectors. More than about 110 Watts per connector and the power protection shuts down the machine hard.

what GPU exactly and how do you power it?
Hello Macshrauber,

Its MSI gaming twin frozr VI of the rx580 ... Oh I just went to see how many pins and found 1 broken wire! I think its an 8 wire connector converter, previously used with the gtx 980 that had more pins along with the other pcie power connector on the board.

I guess that would explain it, thank you!

Seems if using a 6 to 2 pin from the other pcie power on the board would give some more power?
Or a higher quality 6 to 8 pin that wont have wires coming undone?
Or better maybe still there is a dual 6 pin to 8 pin connector?


Think will quit using it again till this one ships if its a good choice. Just got the fresh uncross flashed boot rom for it... (2009 single 6 core) The back up skylake hack is not a bad machine at all. (imac 18,2 with headless igpu/rx470
 
Last edited:
When playing some windows games, will just flat turn off the machine and power button does not work untill unplugging the machine.

Just curious what the explanation is besides its old and is not really a windows machine.
It seems you found the reason already. Anyway, I also suspect something exceeded the SMC limit. May be something overheating, may be a connector (e.g. mini 6pin) overloaded. Therefore, the SMC commanded a hard shutdown protection.

Once this hard shutdown protection is activated. A SMC reset is required before you can power up the cMP again. That's why you need to unplug the power cord first. (It seems Apple force the user to disconnect the power cord, which facilitate them to open the case and check all the hardware before power up again)

The reason why it only happen in Windows, most like because you only really stress the card the max in Windows gaming.
 
Last edited:
It seems you found the reason already. Anyway, I also suspect something exceeded the SMC limit. May be something overheating, may be a connector (e.g. mini 6pin) overloaded. Therefore, the SMC commanded a hard shutdown protection.

Once this hard shutdown protection is activated. A SMC reset is required before you can power up the cMP again. That's why you need to unplug the power cord first. (It seems Apple force the user will disconnect the power cord, which facilitate them to open the case and check all the hardware before power up again)

The reason why it only happen in Windows, most like because you only really stress the card the max in Windows gaming.
Thanks again, Martin. Was a cheap connector and was a long time since checking. One black wire separated from the connector. Had the same shut down occur on a cutscene with another game before so I just skipped it and avoided it and played the game without it. This one was xbox app loading Mechwarriors 5, that one as soon as the company splash shows it happens there. Some games must be programmed to just draw more power from the card at spots.

Good to have it more healthy lately, yes was kind of forced to take better care of. Getting the NB cooler, and not needing to run the fan at higher RPMs and still having it cooler than before. Just redoing the thermal paste and substituting some bolts instead of the cheap plastic push pins. I never did it when upgrading to 6 core many years back.

Even unhealthy did pretty well considering that. The only real problem ended up being was chrome and a bad extension that caused the system to lock up.

Rather impressive prolonging of support compared to the 1st Mac Pro, was only about 4 yrs Lion to el capitan. Whereas this one support ended at el capitan and goes to Monterey 6 years.

I dont know about the one in the middle never owning one...
 
Last edited:
Well, got the cable on and I try that game again and this time the fan cranks up on the GPU and the display goes black but it does not kill the power. Going to try the proper driver could be the problem
 
Well, got the cable on and I try that game again and this time the fan cranks up on the GPU and the display goes black but it does not kill the power. Going to try the proper driver could be the problem
If you know how to use the AMD software to set the GPU voltage and frequency.

Please try 1000mV and 1240MHz.

This should be a very safe settings already. For 1000mV, most RX580 should able to run at 1340MHz, but we lower it to 1240MHz for testing purpose.

With this settings, your RX580 should run at quite a bit cooler. You may try if gaming with this setting still causing the GPU fan to run at high speed and black out.

If not, then we can target on GPU overheating issue.
 
  • Like
Reactions: Sandleford
I try to change voltage and MHz and the game still caused the crash and bluescreen. What I could try to rule out the GPU, is to put it in another machine. Or try the rx470.
 
I try to change voltage and MHz and the game still caused the crash and bluescreen. What I could try to rule out the GPU, is to put it in another machine. Or try the rx470.
May be you can run something like Unigine Heaven (Extreme preset, which run in window mode). Then you keep monitor the GPU's parameters, and see if anything strange.

Of course, it may be driver issue, even the game's issue (if you only tried one game).

And yes, if you have another Polaris GPU, it will be a fairly good swap test by only change the GPU.
 
Not sure what a good score is.

Did not seem to do anything out of the ordinary

Only have had 1 other game where the shutdown would occur during a few of the cutscenes only.

This one, as soon as the loading screen started.




Screen Shot 2023-10-06 at 2.03.04 PM.png
 
Last edited:
Not sure what a good score is.

Did not seem to do anything out of the ordinary

Only have had 1 other game where the shutdown would occur during a few of the cutscenes only.

This one, as soon as the loading screen started.




View attachment 2290299
I think you said the problem only exist in Windows gaming, isn't it?

You better do this test in Windows. Of course you can get the benchmarking score, but you don't need to run the benchmark, but just keep it open for something like 20-30min, and see if anything strange.
 
Yes is windows. I see that makes sense.

If you like, Mechwarrior is 55gb. PM your email, I send key to test.

Running the ultimate setting in windows of Unigine Heaven, ran fine for 30 minutes. Then I ran the benchmark and before that finished the crash and blackscreen occurs

If changing voltage/MHz in Adrenaline software, now I see the settings are not saved on exiting. Keeps resetting the MHz to 300 across all states
 
Last edited:
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.