i have Sapphire 7850 2GB that has DVI-I, DVI-D, HDMI and DISPLAYPORT output.
Iam currently running the two displays on it:
DVI-I output -----> DVI-I to VGA adapter ------> VGA Display (It only has vga input)
DVI-D output ---------------------------------> DVI-D Display (it also has hdmi input and it works if i connect it like that instead of the dvi)
Now i want a third display which will be either Dvi-D input only, or both Dvi-D and Hdmi. It wont have displayport.
I want to run a three monitor setup just for extended desktop space,not Eyefinity. I read sapphire forum post about multimonitor setup (http://www.sapphireforum.com/showthread.php?28155-EWP-G...) and learned that i can only use two ports out of the DVI-I, DVI-D and HDMI combination and then the Displayport needs to be used for the third display for this to work. (With a display that either has direct Displayport input or else using an active DP->DVI-D adapter).
But their post keeps talking about DVI-D connection in all of the examples and theres no mention about the DVI-I port being an option too. So this leaves me wondering if it will work without having to replace the vga display as well.
This is my idea when i get third monitor and active adapter:
DVI-I output -------------> dvi-i to vga adapter ----------> vga monitor (this is what i worry about, using Dvi-i port and not Dvi-D as they show in the post)
HDMI output ---------------------------------------------> hdmi monitor (it has dvi-d as well)
Displayport output -----> DP to DVI-D active adapter -----> Dvi-d monitor (this will be the third new one, probably will have hdmi input too)
one monitor will need to be on dp, i would get one of these approved dongles. they say they are for eyefinity, but i got one of the cheap ones and I had problems with it droping the connection. http://support.amd.com/us/eyefinity/Pages/eyefinity-don...
having one of the signals converted to vga will bring down the quality of the dp monitor, so you should think about upgrading in the future if it bothers you.
1 dvi 1hdmi 1 dp (you cannot use the dvi + hdmi on the same row)
2 x dvi 1 dp
- So by the "row" i guess you mean the lower row of connectors on gpu where DP, HDMI and DVI-I are in one row. I need to use one vga monitor but i dont think i can get an active DP->vga adapter here, so that means i need to use the DVI-I for it and thats in the hdmi row, so that disallows the use of hdmi which is no problem.
- Then i use the "upper row" solo DVI-D for dvi monitor
- and then i get active DP->dvi-d adapter for third monitor (will this do? "sapphire dp to dvi single-link" but description says for hd5xxx and hd 6xxxx http://www.dvhardware.net/news/2010/sapphire_displayport_to_dvi.jpg) Im not sure if i can get any other within my country easily.
So that way it is like:
(upper row solo) DVI-D ----------------------> dvi display
(lower hdmi row) DVI-I ----> dvi-i to vga ----> vga monitor
Displayport ---------> active DP to DVI ------> dvi monitor
Should i get dual-link cables too or is that not a problem? I wont need resolution above 1920x1200 in the future tho.
Hmmm ok, well i have trouble finding a cheap dp->vga adapter here, they are in the same range of the active dp->dvi ones eventho they dont seem to be active and i will have to order from abroad unless i give the sapphire dp->dvi one a succesful try first. Other than that there is loads of miniDP->vga ones tho, but this card has the standard DP.
Anyways thanks alot for the input, it definitely cleared alot of things up and i will see how it goes. I actually have another vga display here, i might try using that as the third one first if i manage to get the DP-vga adapter, i didnt know that DP could be converted to vga and work in three screen setup.
Thanks for links. I can get a dp->dvi-i here, if i further put dvi-i -> vga adapter on that, that should work the same way, right? i never knew displayport had analog signal in it so unless the pins on the dp-dvi-i adapter are just fake holes, it should work
So i tried:
DP->DVI-i adapter ---> dvi-i -> vga adapter --------> vga monitor
- no signal, even when solo connected like this
DP->DVI-i adapter -----------------> dvi monitor
- worked fine solo
Then i tried three displays with that: DP->DVI-i adapter -----------------> dvi monitor
(upper)Dvi-d ------------------------> dvi monitor
(lower)Dvi-i ----------> dvi -> vga adapter ------> vga monitor
- then only the ones connected to direct dvi ports worked and the third one in the DP behaved the same like when i try connect three without using DP, meaning it wont let me extend desktop there but i can duplicate signal of one of the dvis to there.
That makes me think i really need a proper active adapter for the DP and these simple dp->vga / dvi adapters wont do the job.
I wonder how this behaves on nvidia cards (gtx660 specifically, anyone has experience with that? do they need active adapters for 3+ monitors?)
Yes the dp->dvi-i adapter and then the dvi-i->vga on top of it were both passive and it didnt work, i could only duplicate to that display but not extend.
So then i bought active DP->DVI one (http://3dvision-blog.com/wp-content/uploads/2011/03/sap...) which made it work with dvi monitor but to my surprise it was actually DVI-I port going off the adapter so i couldnt resist trying to put the passive dvi-i->vga adapter on it and connect vga monitor but that produced no signal again.
so the working setup is indeed:
1dvii (dvi to vga --> vga monitor)
1dvid (dvi monitor)
1dp (active dp->dvi --> dvi monitor)
(so i guess 7850 with this port setup can run 3 screens max, it would have to have two miniDP ports for four separate screens)
So i guess its simpler solution to just update vga displays for dvi ones rather than trying to fight it with adapters on top of adapters, especially if active dp-> vga ones arent locally available to buy and test. So i get rid of the vga displays and will only use dvi/hdmi to avoid problems in future. Iam very likely gonna try playing around with the ati flex cards in the future too, which can aparently output to 5 monitors separately even without active adapters on the DPs.