MP 1,1-5,1 High temps with RX 580

[imrazor]

@MIKX I've got the Vega 56 working with the 150w 'efficiency' BIOS and EVGA PowerLink. The Vega is short enough that I could mount the PowerLink directly to the video card and still have clearance for the PCIe 'slot holder', though I did have to install the card at an angle before locking it into the slot.

It seems to work fine. In Windows 10, I'm getting about 14500 in Fire Strike, which is a substantial improvement over the 11000 or so I was getting with the RX 580. I'm going to try and track down some of the cables you mention and see if I can give the card more juice. Then I should be able to use the vanilla BIOS, maybe even overclock a little.

One problem that I have encountered is that the system does not like waking from sleep. It will wake from sleep and function normally for 30 - 120 seconds, then spontaneously reboot. Not sure if this is the PSU, OWC SATA III adapter, FileVault or something else. I guess if I have to, I can just disable sleep, but power management was one of the reasons I switched away from Hackintoshes.

 

[orph]

spontaneously reboot

sounds like you are triping the power suply

 

[imrazor]

@orph What's weird is that it doesn't happen while the system is under load. I can play AAA games for hours. But sometimes when the system wakes from sleep, it will run for a minute or so than just restart. Would waking from sleep draw more power than gaming with a Vega 56?

 

[MIKX]

@MIKX
One problem that I have encountered is that the system does not like waking from sleep. It will wake from sleep and function normally for 30 - 120 seconds, then spontaneously reboot. Not sure if this is the PSU, OWC SATA III adapter, FileVault or something else. I guess if I have to, I can just disable sleep, but power management was one of the reasons I switched away from Hackintoshes.

Since Mojave 10.14.6 has been released, there have been quite a few similar cases where cMP owners upgraded to 10.14.6 with and / either the first full installer 18G84 and / or the first supplemental.

I waited until I was sure that 18G103 was indeed the latest full installer and did a clean - full install.
Actually, I did three full, clean installs ; 18G87, 18G95 & lastly 18G103.

I have not had ANY problems at all with 18G103.

It might be worth your while to do a full, clean 18G103 install with out any 3rd. party apps to a spare SSD to see whether your symptoms persist.

 

[orph]

your messing with OC so spontaneously reboot id gess is a bad OC or triping the power suply (maybe with bad OC)

may be something simple like a bad cable or loose cable to

simply that's not a blue screen, gray screen of death or beachball that tend to be software or bad ram/drive problems.
a hard shutdown is not a good thing, most comon is PSU

there have been cases of bad wall plugs, overloaded extension cables and a few more random things that did it.
most the time it's user error (OC is user error as your runing out of spec XD)

 

[imrazor]

@orph Actually I'm not OC'ing anything. I did say I might try that once I can get more power to the Vega 56, but I have not actually tried overclocking it yet. I'm actually running it below spec (with a backup BIOS that runs at 90% power) to prevent overloading the two 6-pin PCIe connectors provided by the Mac Pro.

What's odd about it is that the system is perfectly fine under full load. It's only when waking from sleep that it has problems. And that happens under Windows and OS X, which does point to a hardware problem. I am having to run an extension cord + power strip to get power to the Mac Pro. I'll look at getting a higher gauge extension cord and a new power strip. Any recommendations?

 

[orph]

it may be something simple like one of the 6 pins not pluged in corect, your SSD is lose, the pci slot is not corectly in but im gessing

 

[MIKX]

@orph Actually I'm not OC'ing anything. I did say I might try that once I can get more power to the Vega 56,

You can add extra power to an EVGa PowerLink from the SATA port sockets.

There are TWO power inputs to the PowerLink.

For input
1. - 2 x Mini 6pin to 1 x 8pin.

For input 2 You can use a 2 X SATA to 1 X 6 pin ( . . or 1 X 8 pin ) = extra power from the 2 SATA ports.
I use this setup with my MSI Armor RX 580. Works !

The PowerLink comes with a spare, interchangeable 6 pin power input socket.

 

[imrazor]

You can add extra power to an EVGa PowerLink from the SATA port sockets.

There are TWO power inputs to the PowerLink.

For input
1. - 2 x Mini 6pin to 1 x 8pin.

For input 2 You can use a 2 X SATA to 1 X 6 pin ( . . or 1 X 8 pin ) = extra power from the 2 SATA ports.
I use this setup with my MSI Armor RX 580. Works !

The PowerLink comes with a spare, interchangeable 6 pin power input socket.

I'll probably give that a try once I get this rebooting issue sorted out. One thing that I'm not sure about is where to find a cable to connect the two mini 6-pin ports on the Mac Pro's logic board to one 8-pin PCIe power plug. If I'm not mistaken, the SATA to 6- or 8-pin is pretty common, but I have no idea where to find a cable for those funky logic board connectors.

 

[MIKX]

Seriously 🙄 . . .. a 10 second Google search for dual Mini 6 pin to 8 pin yielded this . . .

COMeap Dual Mini 6 Pin to 8 Pin PCI Express Video Card Power Adapter Cable for Mac Pro Tower/Power Mac G5 15-inch(38cm)

COMeap Dual Mini 6 Pin to 8 Pin PCI Express Video Card Power Adapter Cable for Mac Pro Tower/Power Mac G5 15-inch(38cm)

www.amazon.com

. . another 10 second Google search yields this . .

StarTech.com 6in SATA Power to 8 Pin PCI Express Video Card Power Cable Adapter - SATA to 8 pin PCIe power (SATPCIEX8ADP)

6IN DUAL SATA TO PCIE VIDEO

www.amazon.com

 

[crjackson2134]

I'll probably give that a try once I get this rebooting issue sorted out. One thing that I'm not sure about is where to find a cable to connect the two mini 6-pin ports on the Mac Pro's logic board to one 8-pin PCIe power plug. If I'm not mistaken, the SATA to 6- or 8-pin is pretty common, but I have no idea where to find a cable for those funky logic board connectors.

A quick search yields this in less than 4 seconds...

COMeap 16AWG Dual Mini 6 Pin to 8 Pin PCI Express Video Card Power Adapter Cable for Mac Pro Tower/Power Mac G5 15-inch(38cm)

The COMeap 16AWG Dual Mini 6 Pin to 8 Pin PCI-e cable is to connect a PCIe video graphics card with 8 pin port to Apple motherboard with mini 6 pin port; Cable Length: 15-inch+15-inch(38cm+38cm) Connectors: 2x mini 6 pin PCIe male, 1x 8 pin PCIe male Gauge:1007-16AWG (standard tin-...

www.amazon.com

 

[imrazor]

Ah, I was searching for "PCIe power cable" and the results I got were lots of regular 6/8-pin connectors. Thanks for the links.

 

[MIKX]

crjackson2134

You win by 6 seconds .. but I am almost 70 now 😇