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jsbfin

macrumors newbie
Jun 21, 2019
4
1
I'm using mini 6 pin to 6 pin cables plugged into a EVGA Power Link. Card is swithched to low power bios


I use a EVGA power link to balance the power, there is a whole section about it on this forum

Yes, I've read about it, but I think the problem with the Evga powerlink and the Vega 56 pulse -card is the placement of the power connectors as they are in the middle of the card and not on the back... I don´t know how I could fit the powerlink in this situation...?
 
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Mac_User 0101

macrumors regular
Oct 8, 2017
133
43
I received my RX 580 (reference) card and installed it into my mid 2010 cMP 5,1. It's actually working surprisingly great. I noticed right away that the card is quiet and my case fans are back to the default rpm values even on High Sierra 10.13.6. My MVC flashed GTX 980 had my PCI and PSU fans spinning a few hundred rpm higher than default. I like the fact that the RX 580 (reference) has a single 6 pin power connector and is a true 2 slot card at a reasonable price. It's also nice to go back to a native supported GPU with normal SMC behavior. My only disappointment, or subjective con that I found is that there is no LED in the shroud. I really love and have become attached to the green light that emanated from the NVIDIA card and illuminated the inside of my case. Another con would be that there is no Apple EFI but us RX 580 and Vega owners may have an option to change that soon! It looks like MVC has been working on something. I found this yesterday: http://www.macvidcards.com/blog/could-it-be-amd-rx-580-with-efi-running-on-314151
 

alchemistics

macrumors member
Dec 27, 2018
86
84
Switzerland
Yeah, but I'm still confused about this: DUAL 6+2pin (2 cables combination)

So from an 8pin to two 6pin + 2pin, but why 6+2 and not just straight 8? :D

As far as I know 6+2 = 8 and is therefore the same. Just get the adapter that is available to you (6+2 or 8).
I even saw a cable that takes the two mini6 pins directly to an 8pin. With this you save one adapter..
 

h9826790

macrumors P6
Apr 3, 2014
16,656
8,587
Hong Kong
Yeah, but I'm still confused about this: DUAL 6+2pin (2 cables combination)

So from an 8pin to two 6pin + 2pin, but why 6+2 and not just straight 8? :D

Because keep the flexibility, no matter 6+6, 6+8, 8+8, all combinations can use this config.

Easier for users to swap cards, no matter for diagnosis, or future upgrade.
 

MisterAndrew

macrumors 68030
Original poster
Sep 15, 2015
2,895
2,390
Portland, Ore.
I looked through the cccmanifest_64.xml file in the Windows driver and it only lists 7 Vega 20 GPUs, including the 6 already supported in macOS plus 1 more with device ID 0x66A4. The only one it lists a name for is the Radeon VII. It appears the Windows driver already supports the 7,1's Vega II and Vega II Duo though since it lists their device IDs.
 

MIKX

macrumors 68000
Dec 16, 2004
1,815
691
Japan
Regarding the EVGa Power link. I use it as BRIDGE for my MSI RX 580.

For cards with two 8 pin sockets in the middle of the card.

1.
Mount the EVGA Powerlink on top of the front PCI / SATA drives area INTAKE fan and secure it with a clean eraser cut to size to give a firm grip.

Like this . .

( bear in mind that this setup is for a single 8 pin RX 580 8gb. ) ..
. .. .

EVGa PowerLink as a bridge.jpg


==========================================

From the cMP to the Powerlink

2. ( For the 1st. Powerlink INPUT socket )
TWO x mini 6 pin to 8 pin Powerlink 8 pin "INPUT" socket.

3. ( For the 2nd. Powerlink 8 pin INPUT socket )
TWO x SATA to 8 pin to the Powerlink INPUT.

=================

From the PowerLink to the dual 8 pin socket GPU

3. Female 8 pin to MALE 8 pin 1st. GPU 8 pin.

4. " " " " " " ditto.

DONE
 

bsbeamer

macrumors 601
Sep 19, 2012
4,313
2,713
Apple eGPU for macOS recommendations updated:
https://support.apple.com/en-us/HT208544

Apple is officially listing these GPUs for eGPU now, but will likely trickle down to MP:

AMD Radeon RX 470, RX 480, RX 570, RX 580, and Radeon Pro WX 7100
These graphics cards are based on the AMD Polaris architecture. Recommended graphics cards include the Sapphire Pulse series and the AMD WX series.

AMD Radeon RX Vega 56
These graphics cards are based on the AMD Vega 56 architecture. Recommended graphics cards include the Sapphire Vega 56 and XFX Vega 56.

AMD Radeon RX Vega 64, Vega Frontier Edition Air, and Radeon Pro WX 9100
These graphics cards are based on the AMD Vega 64 architecture. Recommended graphics cards include the Sapphire Vega 64, XFX Vega 64, AMD Frontier Edition air-cooled, and AMD Radeon Pro WX 9100.
 

donvito4ever

macrumors regular
Apr 9, 2016
116
13
Spain
I have a question: to install a Vega 64 in my cMP is needed pixlas mod or can work with the power of both 6 pins miniPCIe from MB??

I'm reading but no one explain clear...
 

h9826790

macrumors P6
Apr 3, 2014
16,656
8,587
Hong Kong
I have a question: to install a Vega 64 in my cMP is needed pixlas mod or can work with the power of both 6 pins miniPCIe from MB??

I'm reading but no one explain clear...

IFF you only use it for video editing etc, most likely it's OK to use only dual mini 6pin.

However, that's extremely tight. If you do any more demanding job (e.g. 3D rendering), your cMP may be shutdown at anytime.

If you can do Pixlas mod, do it. Then no need to worry about that anymore.
 
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donvito4ever

macrumors regular
Apr 9, 2016
116
13
Spain
IFF you only use it for video editing etc, most likely it's OK to use only dual mini 6pin.

However, that's extremely tight. If you do any more demanding job (e.g. 3D rendering), your cMP may be shutdown at anytime.

If you can do Pixlas mod, do it. Then no need to worry about that anymore.

I had thought in boy a RX Vega 64 8Gb OC new for 290€... but I finally rejected it because occupies 2.5 Slots and I need to remove one of my PCIe cards...
 

h9826790

macrumors P6
Apr 3, 2014
16,656
8,587
Hong Kong
I had thought in boy a RX Vega 64 8Gb OC new for 290€... but I finally rejected it because occupies 2.5 Slots and I need to remove one of my PCIe cards...

For video editing, I don’t think the difference between Vega56 and 64 is that huge.

IMO, it will be much easier to manage a dual slot Vega56.

E.g. Powercolour Red Dragon, MSI Air Boost, XFX Double Dissipation, or even just the reference card.

No need to give up a slot. Also, more margin if you only power it by dual mini 6pins.
 

MisterAndrew

macrumors 68030
Original poster
Sep 15, 2015
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Portland, Ore.
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tsialex

Contributor
Jun 13, 2016
13,454
13,601
Today AMD announced the WX 3200. A workstation graphics card priced under $200. I don't know the device ID so I don't know if it is supported under macOS. Its predecessor, the WX 3100, is not supported (device ID 0x6985).

https://www.anandtech.com/show/1460...-3200-a-professional-graphics-card-for-sub200
640 stream processors (640:40:16 12 - 10 CUs)? It's probably a Polaris 12 - RX-550/560 equivalent. Interesting product, will sell a lot for entry level CAD.
 

LightBulbFun

macrumors 68030
Nov 17, 2013
2,900
3,195
London UK
its a Lexa based card which OS X does not have drivers for sadly

OS X only has drivers for Baffin and up

it's worth noting the 8x thing is a limitation of the Lexa GPU itself, only having 8x PCIe lanes, the same is true for the Baffin cards like the RX 460/560 as well

but given these are relatively low end cards I doubt they would suffer much if any performance loss from only having 8x lanes
 

Nick [D]vB

macrumors regular
Jun 1, 2018
180
341
I think it's the PCIE x8 limit causing detection problems with most Baffin cards in the 2010/11 iMacs, it's not vbios related, they are detected just fine in older 2009 iMacs, shame they can't output LVDS. Would be interested to know if they work in later xserves, should be a nice bump up from the GT120, with boot-screens, HEVC etc.
 
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MisterAndrew

macrumors 68030
Original poster
Sep 15, 2015
2,895
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Portland, Ore.
The Navi based RX 5700 GPUs are available from AMD today. No macOS drivers yet. They have 8 + 6 pin power connectors. We'll have to see how the power characteristics are to see if they're suitable for unmodified cMP. It's odd Apple didn't include this GPU for the base 7,1 instead of the old Polaris GPU. (Edit: The Navi GPUs are optimized for gaming and have poor compute performance so not suitable for a workstation.)
 
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MisterAndrew

macrumors 68030
Original poster
Sep 15, 2015
2,895
2,390
Portland, Ore.
Yeah, they probably used the same PCB design on all the variants to keep costs down. It looks like the plain 5700 would be fine in an unmodified cMP. I would just combine the two 6-pins first to balance the load. So something like a dual 6 pin to 8 pin cable + a 8 pin to 8+6 pin cable.
 
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MisterAndrew

macrumors 68030
Original poster
Sep 15, 2015
2,895
2,390
Portland, Ore.
It looks like the RX 5700 is only about 10% slower than a Radeon VII and costs half the price, and also consumes almost half the power. Absolutely incredible. Edit: Based on gaming benchmarks. Vega GPUs are still king for compute.
 
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killawat

macrumors 68000
Sep 11, 2014
1,961
3,609
It looks like the RX 5700 is only about 10% slower than a Radeon VII and costs half the price, and also consumes almost half the power. Absolutely incredible.

I wonder if the Sapphire Rx 5700 will become the GPU de rigueur to replace the Sapphire RX 580 Pulse. Once we get drivers of course.
 
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