MP All Models AMD Radeon RX 6800 XT / 6900 XT for macOS?

[avkills]

As pictured, if I have 2x 6800xt or 6900xt installed, and no mpx module, how should I connect the monitor?

I'm going to use two Ultrafine 5Ks. (It only has a Thunderbolt 3 slot, and the 6800 and 6900 only have an HDMI or DP slot.)

1. Do I have no choice but to use a conversion cable?
2. Or is it possible to connect two Gigabyte 6800xt or 6900xt and 580x together to connect the monitor to the main body of the Mac Pro? (In this case, 3 graphics cards are used)

You may be **** out of luck. I have not seen anything like a DP > USB-C (Thunderbolt cable); All the adapters I see are always USB-C (Thunderbolt) > DP or HDMI. And plugging one of those into a monitor input probably would not work either.

You can not bridge those GPUs together at all. And even if you could, that isn't how CrossFire or SLI would work anyway.

There is a reason to spend the extra for MPX modules, so you get the display routing to the other Thunderbolt ports on the Mac Pro. Off the shelf cards can't to that.

Although It would be cool if someone made a card that plugged into the "extra" MPX PCI stuff that allowed you to route display outputs from another card; but you probably could not even do that with that many cards installed, even if such a thing existed.

 

[goMac]

You may be **** out of luck. I have not seen anything like a DP > USB-C (Thunderbolt cable); All the adapters I see are always USB-C (Thunderbolt) > DP or HDMI. And plugging one of those into a monitor input probably would not work either.

You can not bridge those GPUs together at all. And even if you could, that isn't how CrossFire or SLI would work anyway.

There is a reason to spend the extra for MPX modules, so you get the display routing to the other Thunderbolt ports on the Mac Pro. Off the shelf cards can't to that.

Although It would be cool if someone made a card that plugged into the "extra" MPX PCI stuff that allowed you to route display outputs from another card; but you probably could not even do that with that many cards installed, even if such a thing existed.

There is one! I think Apple used to sell it.

Premium iPhone, iPad and Macbook accessories | Official site | Moshi

Premium iPhone, iPad and Macbook accessories made only from the finest materials. Designed for modern living, making fewer, better products.

www.moshi.com

Unfortunately there is a catch. And it’s a big one with the Ultrafine 5k. The cable maxes out at 4k. So it will work with the display but not at full quality. But I have used this cable to drive a Ultrafine 5k from a Radeon 580 on a 5,1.

 

[avkills]

There is one! I think Apple used to sell it.

Premium iPhone, iPad and Macbook accessories | Official site | Moshi

Premium iPhone, iPad and Macbook accessories made only from the finest materials. Designed for modern living, making fewer, better products.

www.moshi.com

Unfortunately there is a catch. And it’s a big one with the Ultrafine 5k. The cable maxes out at 4k. So it will work with the display but not at full quality. But I have used this cable to drive a Ultrafine 5k from a Radeon 580 on a 5,1.

That adapter is a USB-C/Thunderbolt output to a DP port; not the other way around. I would love to be proven wrong, but I do not think it will work taking a DisplayPort output and plugging it into a monitor with USB-C/Thunderbolt input.

 

[joevt]

There is one! I think Apple used to sell it.

Premium iPhone, iPad and Macbook accessories | Official site | Moshi

Premium iPhone, iPad and Macbook accessories made only from the finest materials. Designed for modern living, making fewer, better products.

www.moshi.com

Unfortunately there is a catch. And it’s a big one with the Ultrafine 5k. The cable maxes out at 4k. So it will work with the display but not at full quality. But I have used this cable to drive a Ultrafine 5k from a Radeon 580 on a 5,1.

XDR uses less bandwidth than UltraFine 5K if DSC is involved. Search Mac Rumors for XDR, Navi, 5700 XT, RTX 3080, etc.

That adapter is a USB-C/Thunderbolt output to a DP port; not the other way around. I would love to be proven wrong, but I do not think it will work taking a DisplayPort output and plugging it into a monitor with USB-C/Thunderbolt input.

It says it's bidirectional.

 

[avkills]

XDR uses less bandwidth than UltraFine 5K if DSC is involved. Search Mac Rumors for XDR, Navi, 5700 XT, RTX 3080, etc.


It says it's bidirectional.

Interesting; and good to know.

 

[flowrider]

As pictured, if I have 2x 6800xt or 6900xt installed, and no mpx module, how should I connect the monitor?

I'm going to use two Ultrafine 5Ks. (It only has a Thunderbolt 3 slot, and the 6800 and 6900 only have an HDMI or DP slot.)

1. Do I have no choice but to use a conversion cable?
2. Or is it possible to connect two Gigabyte 6800xt or 6900xt and 580x together to connect the monitor to the main body of the Mac Pro? (In this case, 3 graphics cards are used)

Both of these cables work:

Monoprice Bidirectional USB Type-C to DisplayPort Cable - 4K@60Hz, Black, 6ft - Monoprice.com

No longer will you be limited by the direction of your cable! This Bidirectional USB-C? to DisplayPort? Cable allows you to connect your legacy DisplayPort devices to your newest USB-C enabled display

www.monoprice.com

Belkin Charge and Sync Computer Connection Cable for HUAWEI VR Glass

Adapt HUAWEI VR Glass to connect with computer. Support DisplayPort high-speed transmission. Support HUAWEI VR Glass PC mode 3K 90Hz resolution. 4.5 meters in length, enjoy immersive VR games. 2 USB-A and 1 DisplayPort connet with PC, 1 USB-C port connects with Huawei VR Glass.

www.vmallworld.com

Also some cards (the reference cards) and a few others come with USB-3 ports. Those will work with a USB-3 video cable. A thunderbolt cable will not work.

BTW, you will get 5K with two cables hooked to one monitor.

Lou

 

[Morgonaut]

An update on my list above.

It seems that the Sapphire Nitro+ AMD Radeon RX 6800 XT (NON Special Edition) just barely fits

. Dimension (as per manufacturer's website): 310(L)X 134.3(W)X 55.3 (H)mm. So 310mm might be the limit, but... the margin is so small I dont think I would risk it with any other model, its difficult to know what a manufacturer uses as a measurement reference.

CORRECTION: It is the non special edition in the video, which does fit. The Special Edition DOES NOT fit as it is actually 320mm even though the website indicates 310mm.

An update on my list above.

It seems that the Sapphire Nitro+ AMD Radeon RX 6800 XT (NON Special Edition) just barely fits

. Dimension (as per manufacturer's website): 310(L)X 134.3(W)X 55.3 (H)mm. So 310mm might be the limit, but... the margin is so small I dont think I would risk it with any other model, its difficult to know what a manufacturer uses as a measurement reference.

CORRECTION: It is the non special edition in the video, which does fit. The Special Edition DOES NOT fit as it is actually 320mm even though the website indicates 310mm.

That's not true. You linked my own video and in this video I used the Special Edition version. And it fits absolutely EXACTLY = no mm left = fits perfectly like and MPX module

 

[Casey P]

That's not true. You linked my own video and in this video I used the Special Edition version. And it fits absolutely EXACTLY = no mm left = fits perfectly like and MPX module

Is it possible that the Sapphire 6800xt SE is shorter than the Sapphire 6900XT SE? From what I am seeing on this forum, the people that bought an SE 6900XT couldn't get it to fit, but Margonaut didn't have any problem with the 6800XT.

 

[Morgonaut]

Is it possible that the Sapphire 6800xt SE is shorter than the Sapphire 6900XT SE? From what I am seeing on this forum, the people that bought an SE 6900XT couldn't get it to fit, but Margonaut didn't have any problem with the 6800XT.

I never trust to anybody, people say lot of crap on internet. I only trust to my own testing and I recommend only components I personally tested and verified. So when I say in my video that Sapphire Nitro+ RX 6800 XT Special Edition fits perfectly to 2010 Mac Pro, then it's true. It's even clearly visible in my video.

 

[goMac]

That adapter is a USB-C/Thunderbolt output to a DP port; not the other way around. I would love to be proven wrong, but I do not think it will work taking a DisplayPort output and plugging it into a monitor with USB-C/Thunderbolt input.

It works in _both_ directions. Check the specs.

And like I said originally, I personally have used this cable from a 5,1 without Thunderbolt to a Ultrafine 5k. Me, myself, have used this cable as a DisplayPort to USB-C cable.

 

[avkills]

It works in _both_ directions. Check the specs.

And like I said originally, I personally have used this cable from a 5,1 without Thunderbolt to a Ultrafine 5k. Me, myself, have used this cable as a DisplayPort to USB-C cable.

I already acknowledged that above; good information.

 

[diamond.g]

As pictured, if I have 2x 6800xt or 6900xt installed, and no mpx module, how should I connect the monitor?

I'm going to use two Ultrafine 5Ks. (It only has a Thunderbolt 3 slot, and the 6800 and 6900 only have an HDMI or DP slot.)

1. Do I have no choice but to use a conversion cable?
2. Or is it possible to connect two Gigabyte 6800xt or 6900xt and 580x together to connect the monitor to the main body of the Mac Pro? (In this case, 3 graphics cards are used)

The reference AMD cards have USB-C ports that can do DP over USB-C.

 

[flowrider]

Is it possible that the Sapphire 6800xt SE is shorter than the Sapphire 6900XT SE? From what I am seeing on this forum, the people that bought an SE 6900XT couldn't get it to fit, but Margonaut didn't have any problem with the 6800XT.

This says - The Same:

Compare Sapphire Nitro+ Radeon RX 6900 XT vs Nitro+ Radeon RX 6800 XT SE

Compare Graphics Cards: Sapphire Nitro+ Radeon RX 6900 XT vs Nitro+ Radeon RX 6800 XT SE. Moderately better average performance (around 13%), around 12% lowe...

pangoly.com

Lou

 

[Rian Gray]

I'm hoping if I could hear from people who have Sapphire cards installed. It seems there are conflicting experiences installing Sapphire branded cards, even though 6800xt and 6900xt Nitro+ lines come with the same dimensions specified by the manufacturer.

So how was your experience installing it? Was it too close/tight in lengthwise? Were brackets(clamps) on the either side hard to put it back on?

I'm being optimistically cautious here, since my own experience with Asus' Vega 64 card; brackets wouldn't close.

edit: I was able to find a post on a different website measuring Nitro+ 6900 xt SE to be 320mm.

 

[Morgonaut]

This says - The Same:

Compare Sapphire Nitro+ Radeon RX 6900 XT vs Nitro+ Radeon RX 6800 XT SE

Compare Graphics Cards: Sapphire Nitro+ Radeon RX 6900 XT vs Nitro+ Radeon RX 6800 XT SE. Moderately better average performance (around 13%), around 12% lowe...

pangoly.com

Lou

Do you think I used saw to cut my 6800 XT SE down to fit?? No, as I showed in my video it fits perfectly.

 

[Tala]

Do you think I used saw to cut my 6800 XT SE down to fit?? No, as I showed in my video it fits perfectly.

The Sapphire manufacturer published the wrong size for the 6900xt SE, and the naming is very similar so its very confusing...

 

[Goog Goog]

You may be **** out of luck. I have not seen anything like a DP > USB-C (Thunderbolt cable); All the adapters I see are always USB-C (Thunderbolt) > DP or HDMI. And plugging one of those into a monitor input probably would not work either.

You can not bridge those GPUs together at all. And even if you could, that isn't how CrossFire or SLI would work anyway.

There is a reason to spend the extra for MPX modules, so you get the display routing to the other Thunderbolt ports on the Mac Pro. Off the shelf cards can't to that.

Although It would be cool if someone made a card that plugged into the "extra" MPX PCI stuff that allowed you to route display outputs from another card; but you probably could not even do that with that many cards installed, even if such a thing existed.

Thank you for the information. If I use the LG 32ul950 monitor and connect the monitor directly to the graphics card DP slot, can I use it normally with just two 6900xt cards? (Without Apple MPX Module)

*I would like to use only two 6900xt or 6800xt cards to construct a Macpro without MPX modules; mainly using after-effects and Premier, C4D, and OctaneX.

 

[Grumply]

As pictured, if I have 2x 6800xt or 6900xt installed, and no mpx module, how should I connect the monitor?

I'm going to use two Ultrafine 5Ks. (It only has a Thunderbolt 3 slot, and the 6800 and 6900 only have an HDMI or DP slot.)

1. Do I have no choice but to use a conversion cable?
2. Or is it possible to connect two Gigabyte 6800xt or 6900xt and 580x together to connect the monitor to the main body of the Mac Pro? (In this case, 3 graphics cards are used)

Unless you don't have any other I/O you need to put in the machine, I don't 2x 6800/6900XTs + a 580 MPX is going to be viable. They're going to take up basically all of your PCI slots.

Is there a problem with using conversion cables? They might limit you to 4k I suppose. But 4k isn't really usable with a 32" monitor (let alone a 27"). Text becomes unreadable (without re-scaling to a much low resolution). So I don't think you're really losing anything (if that's the only restriction).

 

[kennyman]

BTW, you will get 5K with two cables hooked to one monitor.

Lou

Lou - could you please elaborate further on how to hook up 2 DPs to get full 5K? Thanks

 

[avkills]

Thank you for the information. If I use the LG 32ul950 monitor and connect the monitor directly to the graphics card DP slot, can I use it normally with just two 6900xt cards? (Without Apple MPX Module)

*I would like to use only two 6900xt or 6800xt cards to construct a Macpro without MPX modules; mainly using after-effects and Premier, C4D, and OctaneX.

Yes; but it will be up to the software on whether it supports multiple GPUs.

 

[avkills]

Do you think I used saw to cut my 6800 XT SE down to fit?? No, as I showed in my video it fits perfectly.

LOL! I actually did Dremel off part of my 1080ti right after I bought it because it would not fit in the case I had at the time for my hackintosh; Ha!

 

[flowrider]

Lou - could you please elaborate further on how to hook up 2 DPs to get full 5K? Thanks

Two bi-directional cables hooked up to two DP outputs to the two TB inputs on the Apple LG monitor.

Lou

 

[goMac]

Two bi-directional cables hooked up to two DP outputs to the two TB inputs on the Apple LG monitor.

Lou

The Ultrafine 5k only has one Thunderbolt input. Was there another adapter?

 

[flowrider]

^^^^You're right. The 27" only has ONE ? I thought it had two like my 24" UltraFine

Lou

 

[Rian Gray]

LOL! I actually did Dremel off part of my 1080ti right after I bought it because it would not fit in the case I had at the time for my hackintosh; Ha!

And I was beginning to think I was the only one insane enough to grind off the edge!