9070 XT - 2x HDMI high refresh displays (144 and 120 Hz) not working

[CoLDAzures]

Basically if I ever get 3 displays I’d like to know I can run 2X DP full bandwidth with 1xHDMI full bandwidth. I don’t mind sacrificing the 2nd HDMI port. Would love confirmation of this @AMD_Vik ? Thanks

You can't. I have 5 displays hooked up to this (1 on a separate USB > HDMI because I couldn't get a second internal card to play nicely with my mobo, likely due to having two highspeed NVMEs hogging PCIe lanes).

I can have both the OLEDs on the DPs at 240hz and 4k no worries, as soon as I introduce any other display onto the remaining HDMI ports the second screen will get bottlenecked and drop from 240hz to a max of 144hz, not a big deal as its a secondary display for watching Twitch and Discord streams mainly.

If I try to introduce the 4K/120 OLED TV as an extra display even if I disable a few of the other monitors I'm prone to drop outs.. screen flickers, goes black, light areas become unstable.. its not the cable as this cable worked fine on my 6800XT a few weeks back doing 4K/120.

So yeah more than two displays with this thing in high bandwidth modes you can forget about it being stable.

I'm going to build a new rig in the next 12 months and ensure I do my reading to get it right, I believe the newer X3D chips all have iGPUs so I can run my non gaming screen(s) off that to help work round the issues I guess? But unfortunately current CPU is a 5900x which doesn't have that.

 

[AMD_Vik]

Basically if I ever get 3 displays I’d like to know I can run 2X DP full bandwidth with 1xHDMI full bandwidth. I don’t mind sacrificing the 2nd HDMI port. Would love confirmation of this @AMD_Vik ? Thanks

this is fine. In addition, boards with 3 DP + 1 HDMI should be able to run all at full bandwidth. The limitation is related to hw specific to HDMI.

 

[GhostDog1981]

this is fine. In addition, boards with 3 DP + 1 HDMI should be able to run all at full bandwidth. The limitation is related to hw specific to HDMI.

Thank you for getting back to me. Really reassuring that I can at least get a triple monitor setup working at full potential.

With regards to the Powercolor Reaper cards their website states that only 2DP can be used concurrently (their boards are 3 DP and 1 HDMI)?

On dual DP and dual HDMI boards, no chance of a software workaround? or as you say 100% hardware limitation?

Thanks

 

[AMD_Vik]

Thank you for getting back to me. Really reassuring that I can at least get a triple monitor setup working at full potential.

With regards to the Powercolor Reaper cards their website states that only 2DP can be used concurrently (their boards are 3 DP and 1 HDMI)?

On dual DP and dual HDMI boards, no chance of a software workaround? or as you say 100% hardware limitation?

Thanks

I'm not aware of any limitations with regards to DP throughput. I can follow up with the dispaly team tomorrow.

 

[ArrBee]

If there was some what to control which outputs were assigned dedicated bandwidth, that would help my situation....

I've 4 (would like 5) connections, but I will only ever need 3 at full bandwidth, and never more than 2 simultaneously...
I thought I was being clever getting 2 HDMI, I wish I'd known that 3 DP was better. could have spent the savings on an adapter....

 

[AMD_Vik]

If there was some what to control which outputs were assigned dedicated bandwidth, that would help my situation....

I've 4 (would like 5) connections, but I will only ever need 3 at full bandwidth, and never more than 2 simultaneously...
I thought I was being clever getting 2 HDMI, I wish I'd known that 3 DP was better. could have spent the savings on an adapter....

There has been some discussion around this, I'm not sure how much I can share on it so far though.

I picked up the Nitro+ despite the X2 HDMI ports (honestly I'm kind of bummed out about the omission of DisplayPort over TypeC). I'd rather buy active converters for those than use straight HDMI display output given the option. Daisy chaining is always an option in my case, I suppose.

from what I gather, RDNA 4 can drive up to four high bandwidth DP connected displays, whereas RDNA3 could drive only two.

I'm not sure how this would behave with DP daisy chained displays and such (given physical DP output limitations on boards) so I'll try to find out more.

 

[ArrBee]

There has been some discussion around this, I'm not sure how much I can share on it so far though.

This sounds promising!

I don't know anything about daisy chaining DP or if it might work for me.... One issue I have is that consumer electronics don't tend to use DP. So output to TVs, AVRs, Projectors have to end up as HDMI. (I guess they could be at the end of a chain, but not in the middle?)

Yeah, USB-C with an adapter would have been good.

 

[EvilOne]

I'm planning on getting a 9070 non-XT with 2xHDMI ports. Will this bandwidth limitation stop me from doing 1440p dual monitors? I planned on running either 144 or 120Hz. My second screen is mainly for side content (websites/YouTube etc), so if it is an issue, could I just limit that screen to a lower refresh rate to ensure my primary display can run at full refresh rate?

 

[ArrBee]

I'm planning on getting a 9070 non-XT with 2xHDMI ports. Will this bandwidth limitation stop me from doing 1440p dual monitors? I planned on running either 144 or 120Hz. My second screen is mainly for side content (websites/YouTube etc), so if it is an issue, could I just limit that screen to a lower refresh rate to ensure my primary display can run at full refresh rate?

My understanding of the discussion so far...
if both monitors are using HDMI out from the card, then yes you might experience a bandwidth limitation. (bandwidth being made up of colour space, bit depth, resolution, and refreshrate.)
It sounds like there might be some driver update being worked on that will allow some control of this...?

If you are using DP, you should be fine with 2x1440p @144Hz

At least, thats how I understand things....


My advice though would be to get a 3xDP model. I wish I had.

 

[AMD_Vik]

This sounds promising!

I don't know anything about daisy chaining DP or if it might work for me.... One issue I have is that consumer electronics don't tend to use DP. So output to TVs, AVRs, Projectors have to end up as HDMI. (I guess they could be at the end of a chain, but not in the middle?)

Yeah, USB-C with an adapter would have been good.

yeah TV's have been a sore spot for me too, but they kind of suck today with all the SW bloat. I've honestly been looking at large monitors in the range of 42-43" diag as an alternative, but I don't think they generally get a lot larger than that.

I'm planning on getting a 9070 non-XT with 2xHDMI ports. Will this bandwidth limitation stop me from doing 1440p dual monitors? I planned on running either 144 or 120Hz. My second screen is mainly for side content (websites/YouTube etc), so if it is an issue, could I just limit that screen to a lower refresh rate to ensure my primary display can run at full refresh rate?

I think this should be within the bandwidth constraints, the second HDMI display may be limited to 120Hz with the SW workaround in place

 

[CoLDAzures]

There has been some discussion around this, I'm not sure how much I can share on it so far though.

I picked up the Nitro+ despite the X2 HDMI ports (honestly I'm kind of bummed out about the omission of DisplayPort over TypeC). I'd rather buy active converters for those than use straight HDMI display output given the option. Daisy chaining is always an option in my case, I suppose.

from what I gather, RDNA 4 can drive up to four high bandwidth DP connected displays, whereas RDNA3 could drive only two.

I'm not sure how this would behave with DP daisy chained displays and such (given physical DP output limitations on boards) so I'll try to find out more.

Daisy chaining didn't help me. I got DP out compatible monitors and it just made the issue worse so I ended up returning them.

 

[mark 11:11]

i have a 3rd screen on its way to me soon hopefully
so im going to be finding out if my 9070xt can actually drive all 3
so far got a pair of g5 27" and the 3rd is hopefully going to be the 34" wide version of the same
so 1440p im guessing 2 on dp and one on hdmi
what do we think my limitations are going to be running like this?
im only a casual gamer my machine is mostly for web browsing/media viewing and music production with the odd blast on a game here and there so hopefully im not asking too much from this lol.
any ideas of any issues i might come across?

 

[ArrBee]

i have a 3rd screen on its way to me soon hopefully
so im going to be finding out if my 9070xt can actually drive all 3
so far got a pair of g5 27" and the 3rd is hopefully going to be the 34" wide version of the same
so 1440p im guessing 2 on dp and one on hdmi
what do we think my limitations are going to be running like this?
im only a casual gamer my machine is mostly for web browsing/media viewing and music production with the odd blast on a game here and there so hopefully im not asking too much from this lol.
any ideas of any issues i might come across?

Sounds to me like you will be fine.

It's really only when you want to make use of multiple screens + high bandwidth.
You don't seem to have a need for high bandwidth so should be fine.

 

[mark 11:11]

idealy id like to get the full 165hz refresh etc on all 3 screens but tbh id really realistically only need one of them [at a time] to be really "doing the thing" for lack of a better term lol. and im guessing that would be the wider version
the other issue is although all 3 share the 1440p vertical 2 of them being 25 something and hte 3rd being 3440 or whatever it is im guessing might class as two seperate resolutions lol
but tbh ive been using just hte 2 27s for a couple of weeks and tbh this would probably do me fine but the 3rd extra screen would be a rather nice to have
would also big a pretty big bonus if any one of them could do "the thing" even if just one at a time would be nice to decide which as and when depending what im doing i can imagine some games might work better on the wide some might not be worth the extra clicking to rearange which is doing what but tbh im fairly certain im massively over thinking this and its probably a problem that would only happen if i was trying to do 4k120 or something lol i tend to over think things more than i do things
thank you this is reassuring lol

 

[ArrBee]

When I am trying to set a custom resolution in adrenalin, the pixel clock value shows as out of range. even though it is the default value for the screen.
So for example, i've a (pixelshift)4k 120Hz projector with a pixel clock of 1186810KHz
When I create a custom resolution the value is already there and I get an error saying it is too not compatible for the screen. Yet the screen is working at native resolution.

Is this part of the limitation of these cards?

 

[mark 11:11]

just to follow up
I've now added the third so one is now on the HDMI and everything seems to be working all fine
I even found that the alleged 100hz refresh limitation over HDMI for these screens actually allowed me to set it at 144hz I'm guessing
they updated it in some way since the rtings review happened [I think that's where I read it lol]
I'm seriously thinking i might want to get a 4th one but I'm guessing that's where il hit this bandwidth problem but yeah I might be about to find out I guess
only issue I found so far is to do with screen layout and the mouse when you go between screens sometimes the pointer ending up on not the right screen but il deal with that its not the worst thing I've had to deal with
I'm guessing being 1440p is probably in my favour wrt to the bandwidth I might find trying to run 4k off the HDMI might give me some issues but so far so good
I forgot how much easier music production is when you have 3 monitors

 

[ArrBee]

Still can't set a custom resolution.

I previously had a custom res exactly how I wanted.
I had 3440x1440 @120Hz 10Bit HDR (over HDMI)

2 things happened though.

1. I changed motherboard (exact same model but a slightly newer BIOS)
2. I reinstalled adrenalin as the CPU temp was not showing)

Things I have tried:
1. DDU the drivers and adrenalin and reinstall (newest version)
2. Noticed that the motherboard was linking the PCIe at only 5 GT instead of 32 GT/s so I forced it to Gen5

But I still don't seem to be able to create a custom resolution.
It has a mixture of inaccurate errors in the software.
1. if I have the projector running at 60Hz native and enter custom res, the refresh defaults to 60Hz. If I just change the res and leave refresh, error = "settings not compatible with display"
2. if I have the projector running 120Hz native res b4 I enter custom, the default refresh show 120Hz but an error against pixel clock (1188000) even tho it is the default that is currently running?? Cant create a new res with the error in place.
3. if I lower the pixel clock or refresh rate (which lowers the clock) it gets rid of the error mark, but still cant create the res with n error message "clear the errors 1st". The errors are cleared!!!!

Again, I did have this working last week b4 replacing the motherboard.

Pulling my hair out here.
I need a GPU that allows custom aspect ration of 21:9.

Any suggestions?

 

[SkeeterUK]

You tried https://customresolutionutility.net/

 

[ArrBee]

You tried https://customresolutionutility.net/

Thanks. I can give that a go.
In the past I've always used the tools in driver.

 

[NZXT30]

Can anybody clarify if you can run HDMI at full bandwidth if you have two HDMI connected displays but only use one at a time?