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Old 09-02-2017, 05:22 PM   #1
chripy811
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is anyone using 2 video cards in their computer? multi-monitor question


Is anyone running 2 video cards in one desktop?

Well, i am but thats not really my question,

I am running 2 DIFFERENT video cards in one system,

each video cards allows me 4 monitors, so i have a total of 8 monitors,

4 monitors on top, 4 monitors on the bottom

the problem is, applications can only run on 4 of the monitors, depending which gpu it is on,

confusing? for example.


If open firefox on any of the bottom monitors, and i can move firefox on all 4 bottom monitors, i am unable to move it to the top 4 monitors,

if i want to move it on top 4 monitors, i have to open firefox on the top monitors, then i can move it freely on any of the top monitor, but not the bottom monitors,


this happens because 4 monitors are plugged into the bottom video card
and 4 monitors are plugged into the top video card

when i used windows, both video cards worked flawless, its just linux


weather i used different video cards or 2 of the same model video cards, windows was fine


but with linux, 2 different model video cards without independently



i want to get rid of my older video card, and purchase another of the same,
that way i will have 2 of them same model video cards, and hopefully, all 8 monitors will work together,
if not, i will sell both my video cards and get 1 video cards that supports 8 monitors

the problem is i have no way of testing 2 of the same model video cards

i wish i had 2 older video cards of the same model, so i could test it, i don't want to purchase a video card and find out it still works the same as two different models , like above



if i use two of the same model video cards, will i be able to freely move applications throughout all 8 monitors?
is anyone using 2 of the same model video cards in a linux system?


help!

Last edited by chripy811; 09-02-2017 at 05:29 PM.
 
Old 09-04-2017, 03:31 PM   #2
business_kid
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If you have 8 monitors running and can get applications to show on 4 on a pc, I congratulate your efforts, and suggest you make a record in the Guinness book of records.


I would split the outputs left/right and not too/bottom, so apps running on 4 would have better aspect ratios. To get apps running on 8 monitors I believe is impossible in any operating system on a humble PC.
 
Old 09-08-2017, 07:05 PM   #3
chripy811
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Quote:
Originally Posted by business_kid View Post
If you have 8 monitors running and can get applications to show on 4 on a pc, I congratulate your efforts, and suggest you make a record in the Guinness book of records.


I would split the outputs left/right and not too/bottom, so apps running on 4 would have better aspect ratios. To get apps running on 8 monitors I believe is impossible in any operating system on a humble PC.

aspect ratios? im not sure what you are taking about, apps look fine in any monitors, that is not a problem

it's not impossible, i've had 12 monitors in the past with windows, windows makes it easy, so its not impossible, even if i buy a single card with 8 outputs, it will work fine with linux,

its not impossible, i dont think you've tried it


but i am 100% sure its not impossible
 
Old 09-09-2017, 02:20 AM   #4
IsaacKuo
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Yeah, definitely possible. I don't have enough monitors to test out things myself, though. In the past, I used xinerama to use 3 video cards at the same time (one AGP, two PCI). It let me drag windows from a display on one card to a display on another card. No problem at all!

But that was a long time ago, and a lot of stuff has changed since then. For one thing, most of my monitors have died so I just don't have enough left to even do this any more.

I didn't want to give advice earlier when I saw this question, because I don't like to give advice when I'm so rusty and my info is so (probably) outdated.

But since no one else has replied, I'll suggest you look at using xinerama. Reading around about xinerama, it seems that it is still the way to do what you want. But there seem to be some limitations or maybe it's just annoying to set up. In the past nVidia's closed source drivers didn't play nice with xinerama; that might still be the case.
 
Old 09-09-2017, 07:37 AM   #5
chripy811
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if i use xinerama, it works, i can move applications throughout all 8 monitors,

the problem with xinerama is when i maximize applications, it maximizes on all 8 monitors,
it wont maximize on 1 monitor, so its useless, seems xinerama is more for gaming or for presentions in huge rooms in corporations


ive had my lcd displays for 12 years and still going, only 1 died and i got it fixed, i bought them all at thrift shops for 20 bucks

nvidia has gotten better, 2 years ago, 2 different monitors didnt work, now its working, but not perfect

i am using a gtx 970 and another old video card,

i want to buy another gtx 970 but they are about 300 dollars still,
im worried if i get one, and it doesnt work the way i want it to, then i am stuck with a 300 video card,

i have an old 8600gts lying around, im going to purchase another one of those and test it, i could get one on ebay for cheap,
but it sucks spending money just to test something, then never use it again,.

i like my gtx 970, although i dont really game much except for emulators,


i should of got this video card instead of my gtx 970

8 monitors!!

https://www.newegg.ca/Product/Produc...9SIA66K3XY7797
 
Old 09-09-2017, 09:58 AM   #6
IsaacKuo
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What desktop environment and window manager are you using? Some desktop environments play well with switching the window manager, and maybe a xinerama aware window manager will maximize windows the way you want (onto just one monitor).

There is also some way to split a display into virtual displays, but I don't remember off the top of my head how to do it. In other words, you could split things up any way you want (including having borders that exactly match the actual borders of the monitors).
 
Old 09-10-2017, 08:42 AM   #7
chripy811
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i am using linux mint,

i figured it out!


The problem was i did not configure it right/understand how to configure it

my settings were in the nvidia screen configuration was:

monitors 1,2,3,4 = x-screen-0
monitors 5,6,7,8 = x-screen-1


heres the correct setting, each monitors has to be it's own x-screen, like this:


monitor 1 = x-screen-0
monitor 2 = x-screen-1
monitor 3 = x-screen-2
monitor 4 = x-screen-3
monitor 5 = x-screen-4
monitor 6 = x-screen-5
monitor 7 = x-screen-6
monitor 8 = x-screen-7




i didn't understand or even know each screen had to be it's own x-screen
i'm new to xinerama,

i understand it now,
it does have several bugs, but nothing too bad

the biggest problem i am having is my gamecube dolphin emulator where i play games, lags,
i was getting 30 fps , but with xinerama enabled i am getting 20-30, sometimes its way to slow,

it's annoying,

im not sure if its because i have 2 different cards, gtx 970 and gt 640

im wondering if xinerama performance would improve if i had 2 x gtx 970 and get rid of the gt 640


with another 970 i would still be able to have 8 screens,

the problem is i don't want to buy another 970 and find out it still lags, they are still 300 dollars used

but i have a feeling 2 x gtx 970 in sli mode would give more power for 8 screens,

i would even buy a third one for a max of 12 screens! if only i had one for testing



i even put in a third video card, a 7600gs and an 8600 gts, but both of them don't work as a third video card, i can see it in the nvidia settings, but when i plug in a monitor nothing happens,
i tried those 2 video cards alone, and they work fine in ubuntu and mint, just won't work as a third video card,

i really miss that from windows, windows had it perfected, i remember putting in 3 different video cards and boom! plug and play, works right off the bat, it was great,

but going back to widows isn't an option, i hope linux fixes that in the future, or maybe it's the nvidia drivers in linux,
im not sure, but i love multi-monitors!
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Last edited by chripy811; 09-10-2017 at 08:52 AM.
 
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