How many displays can my GPU run at once? (Asus HD7950-DC2T-3GD5)

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heatl0rd

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Nov 21, 2013
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Hi Guys,

 Can someone help me to figur out how many displays my GPU can support at one time? here is a picture of the outputs.

https://www.asus.com/media/global/products/5ymbx1oadz9Yi9JD/IIOg0aFVAfxO4J2w_500.jpg

 The box says it supports up to 8 displays however ill assume thats in GrossFire form.

 Ive heard things about having a Active/Passive adapter in order to support more then 2 monitors. If someone can confirm if this is the case.

 

Im planning on using 3x Dell U2414H

http://accessories.ap.dell.com/sna/productdetail.aspx?c=au&cs=audhs1&l=en&redirect=1&s=dhs&sku=391-BBNC
 
Solution
ThomasLeong
Your gfx card should be able to support at least 3 displays connected direct to the card. The 8 displays the box mentions is probably with a MST hub like one of these from Club3D -
http://www.club-3d.com/index.php/products/reader.en/product/mst-hub-1-3.html
...though a user from another forum has bought and used a couple and questions its stability in maintaining a high resolutions. Seems to default to 640x480 sometimes. Could be an EDID problem. I digressed...

Back to your question. Your gfx card has the following outputs - DP, HDMI, and 2 x DVI (probably one DVI-D and one DVI-I as do most other gfx cards).
Be aware that the Dell monitor you mention has no DVI inputs...and your gfx card has 2 such outputs. So you would need at least...
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Wolfshadw

Wolfshadw

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You should be able to connect up to three monitors to that card. Since the monitors you're looking at have DisplayPort connections already, you won't need any active/passive adapters:

Graphics card DisplayPort --> Monitor 1 DisplayPort
Graphics card HDMI --> Monitor 2 HDMI
Graphics card DVI --> Monitor 3 HDMI (using a HDMI to DVI cable).

-Wolf sends
 
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ThomasLeong

ThomasLeong

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May 27, 2013
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Your gfx card should be able to support at least 3 displays connected direct to the card. The 8 displays the box mentions is probably with a MST hub like one of these from Club3D -
http://www.club-3d.com/index.php/products/reader.en/product/mst-hub-1-3.html
...though a user from another forum has bought and used a couple and questions its stability in maintaining a high resolutions. Seems to default to 640x480 sometimes. Could be an EDID problem. I digressed...

Back to your question. Your gfx card has the following outputs - DP, HDMI, and 2 x DVI (probably one DVI-D and one DVI-I as do most other gfx cards).
Be aware that the Dell monitor you mention has no DVI inputs...and your gfx card has 2 such outputs. So you would need at least a DVI-DP adapter. Google for it. I'm only familiar with DP or mini-DP to DVI Adapters, not the other way around. Active Adapters are usually needed when connecting to more than 2 monitors, and usually applies to DP or mini-DP to DVI (or VGA) Adapters.

For a 3-monitor setup with your gfx card, the connection would be - DP to DP or mini-DP for one monitor (since the monitor comes packaged with one mini-DP to DP cable)
- HDMI to HDMI/DP/mini-DP for another
- DVI-I to DP/mini-DP/HDMI for the 3rd.
(Chances are the DVI-D cannot be used simultaneously with the HDMI output as most cards are "either DVI-D or HDMI, but not both", and fail to mention this properly. I could be wrong so you'll have to check with your gfx card manufacturer on this).

Overall, just be prepared for connectivity/cable end-to-end matching problems, but otherwise, the gfx card is capable of supporting 3 monitors.

ThomasLeong
 
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Solution
Wisecracker

Wisecracker

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Jan 15, 2007
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You can do up to six displays (not sure about the '8'). Display-port 1.2a 'technically' allows up to 63 video streams via multiplexing but that likely requires some serious additional hardware.

Note in your monitor specs the "1 DisplayPort out" per unit -- you essentially 'daisy-chain' displays. Note that you also have 'upstream and downstream' USB3 capability. Your cabling starts to get a bit expensive (some DP/USB3 cables I recall being $100+ each).

My understanding is when you get your setup appropriately wired and boot-up, Windows will only recognize one or two displays --- you then have to enter CCC and set up your monitor grouping.



 
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stavros58

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stavros58

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Hi Thomas Im running two monitors on a HD7870 MSI one is on the DVI-D the other is on the HDMI output with an DVI-D adapter connected to the monitor and it works fine so that bit can be done. Im currently looking at getting mini DP converter so I can put a third monitor on the same card. Alternately if you run Crossfire like I do if you disable crossfire in catalyst you can run monitors off the second card as well although not ideal it does work. Whats really confusing me at the moment is that on my old Asus board I could run a monitor off the Intel HD4000 onboard processor graphics output and the discrete cards as well at the same time but have been unable to do it on the Asrock Extreme 6 Z77 so far.
 
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ThomasLeong

ThomasLeong

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Hello stavros58,

Your motherboard supports such a feature. Please refer to your Extreme6 Z77 manual pages 35-36 titled "Surround Display Feature" on how to set it up. Basically, you must enter UEFI setup (F2) and 'share the onboard memory' for the onboard gfx to work, else the Auto Share Memory disables the onboard when a discrete card is added.

ThomasLeong

 
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stavros58

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stavros58

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Hi Thomas feeling a bit like I have hijacked someone else's post here. I tried your suggestion and it was a good one but it still didn't work and I double checked the manual and still no idea why it isn't displaying
 
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ThomasLeong

ThomasLeong

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stavros58,
1. For the onboard gfx, your mobo allows only 2 monitor connections. Presume you are using only one monitor for this, and the other two are connected to your discrete gfx card.
2. Have you followed this? (Chapter 3.4.2 - North Bridge Configuration) -
"IGPU Multi-Moniter
This allows you to enable or disable IGPU Multi-Moniter. The default value is [Enabled]. If you wish to install a PCI Express card under Windows XP/Vista OS, please disable this option."

The above is a bit confusing, so I would try Enable and then Disable to see which matters.

3. Check also with Device Manager that you do have the onboard VGA gfx driver installed (as well as your discrete gfx driver).

4. Allow more shared memory for the onboard card?

5. Try another connection to the onboard card - DVI, HDMI or VGA. Usually VGA should work. DVI or HDMI is more finicky. Try not to use adapters/converters. A straight VGA-VGA connection (or DVI-DVI; HDMI-HDMI) for troubleshooting is better. Try another cable (one pin out or loose can disable the connection). Basically, you want to be sure any cable or adapter used works (on another pc?).

Other than the above, I'm stumped as well. Sorry.
(BTW, I have the Extreme4 Z87, but since the chipset is different, settings and internal chipset switches are also different so I cannot check with my setup).

Thomas
 
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heatl0rd

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Thank you for the above solution Wolf.

Well i just got my DELL U2414H monitors and i found a another interesting way to connect all 3 monitors to the gpu. I ended up daisychaining all 3 monitors via the displayport via 1.2a. This means that i only had the single DP cable plugged into my GPU!

Amazing i had not heard that this was a thing. Great solution for anyone else out there!
 
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