using 2 crossfire R290s to display dual 4k 60hz

[carlitonz]

Hi all

 

I have a quick-ish question about setting up 4k monitors

 

 

I have just built myself an almost brand new system.

I7-8700k 

Asus z370 prime a MOBO

64GB DDR4 RAM 

dual samsung evo 960 256gb NVMe SSD drives + several 3tb  HDDS 

750 Watt PSU 

Win 10 pro 

Linux Mint x64

 

2x not so new but fully functional Radeon R290 Graphics cards

(They were free and this allowed me to put more money elsewhere in my system, will upgrade graphics card(s) when they come down in price)

 

 

I am Just about to purchase 2x LG - 27UD88-W 4k monitors 

I do a fair bit of photo editing and these seem like the sweet spot for that ( here in NZ anyways) I do not do a lot of gaming and will probably just switch to my current 1080p monitors if i need to game.

 

My current graphics cards are running in crossfire mode
 

 

The big question is can I some how rig up the 2 monitors in a way so I get 4k @ 60HZ using the 2 display ports available to me  (1 per R290 Graphics card)? 

As it stands I cant use any of the display outputs on my second card. Is there a way i can get the second Display Port to work so i have 60 hz on both monitors. I am reluctant to drop a bunch of $ on a second 4k display only to have it capped at 30 hz ( The HDMI and DVI outputs on the r290s only support 4k 30 HZ) 

 

 https://www.pbtech.co.nz/product/MONLGL52788/LG-27UD88-W-27-UHD-4K-IPS-LED-Monitor-100mx100m-VE

any input or other solutions would be great!! 

 

 

[Streetguru]

5 minutes ago, carlitonz said:

 

You can just get a display port hub potentially.

You can also just run games at 1080p on a 4k display with no issues.

[LHJKO]

You don't need to crossfire to run multiple displays unless you plan for it to act as 1 monitor Eyefinity or something like that 

[carlitonz]

Ok so can I somehow enable the display outputs to my second radeon card? 

[Streetguru]

10 minutes ago, carlitonz said:

Ok so can I somehow enable the display outputs to my second radeon card? 

Old wisdom is that you can't use the second card to output displays, might be better off going to the AMD sub reddit or something, not sure you can use monitors on both GPUs if they're in crossfire mode, might be a way to turn it off and do it.

[carlitonz]

14 minutes ago, Streetguru said:

Old wisdom is that you can't use the second card to output displays, might be better off going to the AMD sub reddit or something, not sure you can use monitors on both GPUs if they're in crossfire mode, might be a way to turn it off and do it.

Looks like ill have to do a bit more digging. The funny thing is there appears to be an "enable/disable" crossfire toggle somewhere in the radeon control panel but ill be dammed if i can find it. Its not even in the additional settings panel. I might try use my integrated Display port out and see if that can do 4K @  60hz. only thing is i'm not keen to buy 2 of these monitors only to discover some weird incompatibility. 

[Streetguru]

1 minute ago, carlitonz said:

 

Crossfire control should be under gaming->global settings.

You could always just buy one monitor for now until next generation GPUs are out at the end of the year maybe.

Most modern GPUs have 3 display port outputs.

[LHJKO]

If you disable crossfire they should both act as separate cards and can both run separate displays 

[Glenwing]

You can use the outputs on both cards if you disabled Crossfire and use the cards independently.

[carlitonz]

Ok Thanks ill look into disabling xfire when I get back to my pc. If for some reason that doesn't work ill just get one monitor for the time being and wait for the hopefully soon drop in gfx card prices.

 

Thanks for the help