Hi Indiox, thanks a lot for your answer.
Do the Radeon VII need extra power than the available from the MacPro? I've heard about some workarounds and I'd not like to do anything but connect it to the PCIe and the two power cables.
Sorry if I forgot to say this.
Radeon VII has been discontinued, get a RX 5700 XT for the most powerful GPU available right now. It has a TDP of 225W so you should be able to power it without doing the Pixlas mod, you just need a dual mini 6-pin to 8-pin adapter. https://barefeats.com/cmp-5700-xt-vs-other-gpus.html
Thank you all for your help.
It seems that it will be really messy... unless @jscipione solution.
Touching internal cables, or that kind of workarounds are not for me... As maximum, I thought that buying a psu and connect the cables straight to the card, would be the "cleanest" thing to do... but I don't know if this would work. I should turn on first the external psu and after, the MP. Weird, isn't it?
Will think about it. Thank you all.
The RX5700XT is not an option for the OP. The OP is running Mojave, the RX5700XT requires Catalina 10.15.1 or above. No drivers in Mojave.
BTW, I am running an Aorus RX5700XT in my 7,1 NcMP and it has two 8 pin power connectors.
the RX 5700 XT is a 6pin + 8pin GPU and needs to have both powered. yes, it is supposed to keep wattage under 225W but what you suggested would leave the 6pin connector without a proper cable connected. it will cause issues
the OP still need to implement one of the three additional power methods I mentioned in my previous post if using a RX 5700 XT
No, do not take that advice from them, the RX 5700 XT still needs to have both its 6pin and 8pin connectors properly connected and powered (I highly doubt you want to get into undervolting, and/or underclocking, and/or allocating how the power is drawn from the mini 6pins vs the PCIe slot in order to save yourself like $5 on a cable and 5 mins of installation time)
I detailed the separate PSU method in my previous post. I used a separate PSU solely, a separate PSU to power just the 6pin while the 8pin was powered by both the internal mini 6pins, I also used a dual SATA to 6 pin to power the 6pin while the 8 pin was powered by both the internal mini 6pins. They are all appropriate and safe methods for a 6+8pin GPU such as the RX 5700 XT
While 225W is the correct TDP for RX 5700XT, this not make it a compatible GPU for MP5,1. Even the so common AMD RX 580 has models that when in full load shutdown a MP5,1.I don't have an RX 5700 XT so take this with a grain of salt, but in the barefeats article I linked to https://barefeats.com/cmp-5700-xt-vs-other-gpus.html it says:
"Because the RX 5700 XT TDP rating is 225W, we were able to run it using only the factory PCIe bay power feeds.
What do you mean with "power saving ROM" Alex? sorry that I don't understand.
Who makes ref models nowadays? The usual guys? (MSi, Sapphire, Gigabytes?)I think that the safest way is to buy a reference model VEGA 56 and use an eVGA PowerLink and two mini-PCie 6pin cables to power the GPU. This way you will balance the power consumption between PCIe AUX A and B and always keep it inside the safety parameters of the backplane power connectors.
I think that no one is making VEGA 56/64 GPUs nowadays, you'll only find NOS or used cards. For the manufacturer, this is very regional and the reference cards that I find for sale down here will be different from what you will find locally. The best bet is to open the TechPowerUp VEGA 56 page and see all models that use the AMD reference design and try to find one for sale on your regional market. TechPowerUp reference post about VEGA 56 lists the models that use the reference design:Who makes ref models nowadays? The usual guys? (MSi, Sapphire, Gigabytes?)
Any high end GPU newer than VEGA 56 is over the power envelope of MP5,1 without Pixla's mod, see my previous posts where I explain the motives.On a similar question in another thread, I was told Radeon VII is probably the last 4,1/5,1 update before going for a Hackintosh or a MacPro 7,1 in terms of power
While Powertable hacks helps limiting the power usage of a Radeon VII, the spikes of power consumption will continue.I can see a new Radeon VII at 599€ (incl. 24%VAT) in my country. I am a little bit tempted, it would make me a reasonable TwinMotion machine out of my 5.1, for a year or two I think. I've got on of those aformentioned Vega 56 cards (PowerColor Red Dragon, switch at low bios mode) now, and it's good enough, I am quite happy with it. But the memory limit comes in to play sometimes (8GB). 16GB would be ideal for my projects as of now. It would need external power or Pixla's mod. Or, if I remember it right, you could make a mod to the powertable/bios and run it from the orig. PSU (search for h9826790 posts).