I bought last week Asus HD7850DC22GD5 with expectation it can manage 3 monitors.
I have a PC with Asus P867MLE as motherboard, i3 and 4 GB ram. P8J67MLE has onboard video card.
My existing monitor is LG W2442PA, it has HDMI, DVI and VGA.
I bought Dell U2711 it also has HDMI, DVI and VGA and Dell U2412M, it only has DVI and VGA.
Asus HD7850 has 2 mini display ports, 1 HDMI and 1 DVI
I bought two apple mini display to DVI connectors.
Here is the setup
1) HD7850 DVI connect to Dell U2711, this is the only connection to get max resolution 2560 x 1440.
2) HD7850 Mini Display connect to LG W2442PA
3) HD7850 Mini Display connect to Dell U2412
Only 1) and 2) are working, 3) went to save mode. When I disconnect 2), the third monitor 3) automatically go to active mode.
I tried HDMI to connect 2), the same behaviour as above, when HDMI connected to 2), then 3) automatically go to save mode.
So at all of these experiments, I can only connect two monitors to HD7850.
I cannot install another HD7850 because the mother board only has 1 slot. It seems also the VGA/DVI integrated with the mother board is also inactive.
I do not need eyefinity. This build is for software development only,
- left monitor LG for reference, ebooks
- middle monitor, U2711 for programming/coding using IDE
- right monitor, for testing the program
Any thoughts or advices? Do I need to buy a more advanced graphic card? or can I chain the monitors?
Again, I have to stress the importance of using an active adapter to enable the third screen in most AMD card.
9. What is the difference between an active adapter and a passive adapter?
An active adapter can convert a signal from one connector to another. The Apple Mini DisplayPort to DVI and Apple Mini DisplayPort to VGA adapters are active adapters. A passive adapter acts as a pass-through from one connector type to another and does not convert a signal. The Apple Mini DisplayPort to Dual-Link DVI adapter is an example of a passive adapter.
Both of them are working fine, although the resolution from miniports of HD7850 are only 1920x1200.
The max resolution from the DVI port of HD7850 is 2560 x 1440. The max resolution of the monitor Dell U2711 is 2560 x 1600, a little bit higher than the graphic card.
I tested, both of miniports are working, when connected to two monitors. Listed below is one of scenarios that I have tested.
step 1: miniport 1 connected to LG W2442PA, it works fine
step 2: miniport 2 connected to Dell U2412M, it works fine
step 3: DVI, connected to Dell U2711, results: U2412M stop working, going to save mode. U2711 and LG W2442PA are both working.
So only two monitors are working and one is doing save mode. I tried different combinations, all works fine for two monitors, but not three.
What I have tried so far....and does not work
- apple minidisplay port to DVI, apple staff told me, it can only run two monitors, so it does not work for three monitors. I returned one of the adapter, still have another one.
- bought a minidisplay port to DVI from wickedwired.com.au. It has dual link, mini display port and DVI. It does not work, I will return it to the shop tomorrow.
From reading the whirpool forum...these adapters have been validated for AMD
My AMD HD7850 Asus has
- 2 mini display port
- 1 DVI
- 1 HDMI
From the eyefinity setup in this forum
I will need to get
- 1 DVI cable (come with the monitor)
- 1 HDMI to DVI adapter (need to buy this one)
- 1 Minidisplay port to DVI, active
If i get the single link, the resolution only 1920 x 1200
If I get the dual link, the resolution 2560 x 1600
I will try to get these adapter, will post an update.
It is working now, partly . The setup is
- LG W2442, on optimal resolution 1080x1920 portrait, connected to mini display port (mDP) using Apple mDP (GPU) to DVI (monitor), left side
- Dell U2711, on optimal resolution 2560 x 1440 landscape, connected to DVI (GPU) to DVI (monitor)
- Dell U2412M, on optimal resolution 1200 x 1920 portrait, connected to mDP using Mini DisplayPort 1.1a with HDCP1.3 to DVI-D Dual-Link Active Adapter similar to this one, http://www.accellcables.com/products/DisplayPort/DP/mdp... . However this cable is a generic no branded cable, it is branded by the computer shop as wickedwired.com.au. Max output is 1920 x 1200@60Hz.
It only works, if the active mDP-DVI adapter is disconnected from GPU, when the computer is started/powered on.
After two monitors on and the login screen is displayed (not before the login screen is displayed), the active mDP-DVI adapter is connected, then the third monitor works.
I will need to redo this annoying task when I restart my computer. Two monitors are on, the third monitor is asleep. The two monitors went black, the third monitor is still asleep. I disconected the active mDP-DVI from GPU for about 5 seconds. One second after mDP-DVI disconected, the login screen appears, two monitors active again, not black. After I connected the active mDP-DVI, the third monitor is active. All good untill the next restart.