MP 1,1-5,1 OK to use a 6 pin to 8 pin adapter?

[aliennerd]

A friend has given me an Asus HD7970 which looks exactly the same as a Sapphire model I already have save for the power connectors, two 6 pin on the Sapphire, one 6 and one 8 on the Asus. Is it OK to use a 6 - 8 pin converter and run the Asus card in my 5,1?

 

[MarkC426]

GPU Compatibility List for cMP

Content: 1. Summary 2. Information on common GPUs that can be used in cMP 3. GPU power consumption 4. Color compatibility 5. Flashing nuances 6. What to choose? 7. Useful links. 1. Summary 1.1. There are 50+ GPU types that are compatible with cMP (classic MacPro = Mac Pro 1.1-5.1/...

forums.macrumors.com

refer to number 22 on page 1......I would say no, more power is required.

 

[aliennerd]

OK thanks. The Sapphire versions seems to run OK in my other box with just the two six pins, I was hoping the cards would be the same. Does the addition of any 8 pin suggest the Asus version requires even more power?

 

[MarkC426]

Yes, as the wiki page states.

 

[aliennerd]

OK thanks, I notice the ATI RX550 4GB is listed as working with Mojave, does anyone know if the Sapphire 2GB model works?

 

[MarkC426]

Get an RX580 and don’t look back.

 

[MIKX]

The Sapphire Dual-X HD 7970 3 gb also works very well. I keep an EFI flashed one as a spare GPU and have an EVGa PowerLink attached.

EVGA PowerLink with AMD GPUs

Just got the EVGA PowerLink working with my Sapphire Dual-X 7970 3gb. IMPORTANT : The power input sockets on the PowerLink are 2 X 8 Pin female and cannot be changed. The EVGA PowerLink ensures that exact power demanded by a GPU is supplied. That said, one must still supply enough power to...

forums.macrumors.com

 

[tsialex]

OK thanks, I notice the ATI RX550 4GB is listed as working with Mojave, does anyone know if the Sapphire 2GB model works?

Don't buy RX 550, only one model (the one that has the same PCIe ID as RX 560) works with macOS and is almost impossible to find it today. @fhturner made a thread about it recently.

 

[aliennerd]

OK, thank you for the warning tsialex.

 

[tsialex]

OK, thank you for the warning tsialex.

This is the thread:

April 2020 alternatives to RX 560?

Hey Guys 'n' Gals— I have a couple of Sapphire Pulse Radeon RX 580s, and they're great. Using @h9826790's OpenCore config, playback and encoding of H.264 and HEVC is easy and fantastic. As I own and frequently work on multiple Mac Pro towers, I'd like to pick up a simpler, cheaper card or 2...

forums.macrumors.com

 

[aliennerd]

Thanks again chaps. I decided to test the 7970 just to see what that situation was. For the sort of work I'll be using this box for it looks as though it's going to be fine. I did an hour of general browsing, e-mail, Lightroom and Wordpress and according to Hardware Monitor this was roughly the peak power usage.

I then fired up Luxmark just to see what happened and the 8 pin connector quickly shot up to over 75W to around 90-95. I quit out quickly to be safe and although I can't think of any work I'll be doing that will cause similar spikes I have set up some alerts in HM just in case.

 

[RB13]

OK thanks, I notice the ATI RX550 4GB is listed as working with Mojave, does anyone know if the Sapphire 2GB model works?

Just bought the Sappire Pulse RX550 - output doesn't seem to work.

 

[Macschrauber]

95 Watts is beyond a healthy limit,

as the other line is just 45 Watts get an adaptet set with

2xmini6 to 8

8 to 2x6+8

so you will have load balancing within the specs.