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MP All Models AMD Radeon RX 6800 XT / 6900 XT for macOS?
- Thread starter Xenobius
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Are there any 6900XTs that are only two-slots high? I'm already using all PCI slots (with a pair of Radeon VIIs), so can't afford to lose any additional slots to 2.5/3-slot high GPUs.
Yes, but they are liquid cooled. All other 6900XT's (that I am aware of) are 2.5 slots.
Probably relevant to some on this thread:
forums.macrumors.com
AMD Unveils Faster W6000 Series Graphics Cards Suitable for Intel-Based Mac Pro
AMD today announced new Radeon Pro W6000 series graphics cards suitable for workstations like the existing Intel-based Mac Pro. Built on 7nm-based AMD RDNA 2 architecture, the new higher-end Radeon Pro W6800 graphics card delivers up to 79% faster graphics performance than the...
forums.macrumors.com
Fingers crossed for a July / August released....and not waiting till December
I've tried MacOS 12 Monterey with AMD Radeon RX 6800 xt, Core X Chroma egpu, and a Mac Mini 2018. The card works similar to when running under MacOS 11.4 and 11.5. Great performance in apps like Geekbench, games etc, but there is no straight support for HDMI 2.1 timings, 8K@60hz or 4K@120hz.
With SwitchResX it is possible to set an 8K@60hz desktop (with a Samsung Q800T 8K TV), but the signal becomes downscaled to 4K@60hz by MacOS or the 6800/6900 driver when transferred over HDMI. The same happens when using the 6800 xt's DisplayPort via an active adapter. Again, this is the same behaviour as with MacOS 11.5.
Anyone here at MacRumors forum that have luck with MacOS and 8K or HDMI 2.1 timings?
With SwitchResX it is possible to set an 8K@60hz desktop (with a Samsung Q800T 8K TV), but the signal becomes downscaled to 4K@60hz by MacOS or the 6800/6900 driver when transferred over HDMI. The same happens when using the 6800 xt's DisplayPort via an active adapter. Again, this is the same behaviour as with MacOS 11.5.
Anyone here at MacRumors forum that have luck with MacOS and 8K or HDMI 2.1 timings?
Hey guys. SO I have the 6900 XT reference working great in Boot Camp, used the Adrenaline drivers straight from AMD. How do I get my 5700 XT MPX Module to work with the LG 5k attached? Right now they are dormant and it shows as a generic Microsoft Display Adapter...
Im asking obvious question but did you confirm your cables are 8K? Some companies claim it and they lie or ship the wrong one in the box.
You are saying that the LG 5K worked in Boot Camp connected to a Thunderbolt port of the W5700X MPX Module before you installed the 6900 XT and Adrenaline drivers?
Do you have the 27MD5KL model (supports Thunderbolt or USB-C input)? If so, then have you tried connecting the LG5K to the 6900 XT with a bidirectional USB-C to DisplayPort cable? It will support 4K60 or 5K39.
Can you connect a normal display to the W5700X?
Did you try using DDU to uninstall graphics drivers before installing the AMD drivers?
I did try two different 8K certified cables from different manufacturers. But I cant be 100% sure.. I will try my setup with Windows/bootcamp, when I get the time to do it.
^^^^Nope like this one:
Lou
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
Lou
With the new W6800, will there need to be new drivers or will the existing 6800, 6800xt, & 6900xt drivers work? I do find it weird that amd hasn’t updated their compatible os’s for the 6800, 6800xt, & 6900xt to include MacOS. Apple hasn’t updated their eGPU support article to include those either. Is there still limited compatibility? I’m going to contact Apple Support to have them put a request to update that article in later today.
Is there anything funky about using one of those cables to plug a DP graphics card like an rx580 into a type-c display that also provides laptop power on its type-c port?
^^^^Nope no issues - I used one of these cables with my RX5700XT with an LG Apple BT/USB-C display. BUT the USB-C ports on the display will become non-functional. AND they are non functional with any non-Apple video card. I am using the same display with an RX6800 with a USB-C output and no USB power on the display with a USB-C cable.
BUT. this cable does power the USB ports:
www.vmallworld.com
I have one for sale in the market section:
Lou
BUT. this cable does power the USB ports:
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
I have one for sale in the market section:
Lou
sorry, can you clarify that - was the problem specific to it being the TB display?
I'm thinking it might be a way to check if the problem with my BenQ SW270c disappearing from the system when it sleeps the panel when plugged into displayport (but not when plugged into HDMI) is specific to the DP port on the monitor, the DP port on the GPU, or using DP protocol at all.
I understand that LG 5k 27MD5KL monitor will not work at full 5k @ 60Hz with the bidirectional USB-C to DisplayPort cable while being connected to the display port of the 6800XT / 6900XT GPU. May I confirm whether it will work with for example HiDPI 2560 x 1440 or higher? Appreciate if someone with a LG 5K monitor could try that (retina setting under display), thanks.
The display will default to a 4k mode, with a UI scale of 5k HiDPI. Basically a 5k HiDPI resolution that's being downsampled to 4k resolution/output.
Thanks, I will not get 5k dot per dot but it will be 4K upscale to 5K (I understand).
LG 5K 27MD5KL requires two tiles of 2560 x 2880 to do full 5K. Since USB-C to DP bidirectional cable does not have enough bandwidth, I should not be able to get 2560 x 2880 HiDPI (Pixel Doubling) with the USB-C bidirectional cable to DP directional.
Max resolution should be 1920 x 1080 HiDPI with the 6800XT / 6900XT with the USB-C bidirectional cable to DP directional unless I`m mistaken.
Mostly true. But bandwidth doesn't really limit resolution. With any connection, you can increase resolution by reducing refresh rate - you just have to stay within certain limits:
- refresh rate range
- horizontal scan rate range
- pixel clock range
- width range
- height range
My 4K display can accept a resolution of between 192 pixels and 8K. macOS doesn't work well at 192x108 resolution...
You could try 5K at 39Hz using a custom resolution created by SwitchResX. I've seen one person try that https://forums.macrumors.com/thread...indows-computers-via-dp.2227756/post-29570562 . The connection is HBR2 which should be able to do 5K 46Hz 8bpc RGB with a single DisplayPort connection but the LG UltraFine 5K appears to be limited to a pixel clock of ≈600 MHz for a single DisplayPort connection.
The LG 5K doesn't support HBR3 but if it could, then it would support 5K 60Hz 8bpc RGB with a single cable. DSC would be required to get 10bpc RGB. Instead the LG uses Thunderbolt to get two HBR2 connections (supports 5K 60Hz 10bpc RGB).
I would like to see an adapter for these dual cable / dual tile displays that takes a HBR3+DSC signal (5K, 5K2K, 4K144, 8K60) and outputs two DisplayPort signals - one for each tile. This would solve the problem of requiring two cables from the GPU for best resolution/refresh rate and would increase the number of displays that can be connected. Plus, it works around the crappy tile support of macOS (macOS doesn't supported tiled 4K144 or 8K60). For horizontal tiles, the adapter would have a latency of half a scan line. For vertical tiles (do they exist? maybe - search for T221 or Bertha in the MacRumors forums), the adapter would have a latency of half the vertical period.
An MST hub can do similar but the only problem an MST hub solves is requiring two cables from the GPU. The two streams count as separate displays even if they're going to the same display so the number of displays allowed is still reduced. Besides, macOS doesn't support MST for multiple displays or even multiple tiles (except for multiple tiles in old single cable 4K displays).