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3x Asus VG248QE with 2x HD 7950 in Crossfire, DisplayPort confusion

Last response: in Graphics & Displays
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June 26, 2013 1:49:37 AM

I recently purchased 3x Asus VG248QE and 2x Radeon HD 7950 (http://www.newegg.com/Product/Product.aspx?Item=N82E168...) in Crossfire to obtain high refresh rates and to use Eyefinity. I am a bit confused on what I will need to buy in order to run all three monitors at 144Hz. I've read that I need to have all of them hooked up via DisplayPort. The issue is that my card only has one DP. I know there are adapters to run DP to HDMI and DP to DVI, but I'm not sure if this preserves the refresh rate?

After doing some research, I've discovered daisy chaining or buying a DP 1.2 MST capable hub. This seems to be what I need to do? What I am confused about is if the parts I have (the ones listed above) support daisy chaining or do I need to buy a hub? Will the hub work? Can I even buy these yet?

Basically, my main question is what do I need to do to run all three monitors at 144Hz with the graphics card having 2x DVI, 1 DP, and 1 HDMI. I really hope that there is a way around this. Thanks in advance!
a b Ĉ ASUS
a c 78 C Monitor
June 26, 2013 1:54:47 AM

The Dual Link DVI port can support 1080p at 144hz.
You should also be able to use the Displayport... ports... on both cards. You aren't just limited to the primary GPU for display outputs in a Crossfire setup.
June 26, 2013 1:57:49 AM

manofchalk said:
The Dual Link DVI port can support 1080p at 144hz.
You should also be able to use the Displayport... ports... on both cards. You aren't just limited to the primary GPU for display outputs in a Crossfire setup.


Well, I have this mobo and it says that I will only be able to run displays on one card?

EDIT: Indeed, I thought I would be able to do what you said too...
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a b Ĉ ASUS
a c 78 C Monitor
June 26, 2013 2:04:27 AM

I dont see why the motherboard would be the limiting factor in this kind of thing (except maybe slot bandwidth, which your fine for BTW). Where does it say that you can only display from the one card?
June 26, 2013 2:09:33 AM

manofchalk said:
I dont see why the motherboard would be the limiting factor in this kind of thing (except maybe slot bandwidth, which your fine for BTW). Where does it say that you can only display from the one card?


It says it in the mobo manual under the AMD Crossfire section: "Please note that although two graphics cards have been installed, only the display ports on the graphics card installed in the first PCIe x16 slot will work. All displays should be connected to this graphics card."
a b Ĉ ASUS
a c 78 C Monitor
June 26, 2013 2:19:45 AM

OK, after looking up on it seems you do need to connect to the Primary GPU.
http://www.amd.com/us/products/technologies/amd-eyefini...

It seems that your initial suggestion was correct, you will have to use some kind of Displayport hub to hook up the three monitors.
http://www.amd.com/us/products/technologies/amd-eyefini...
Whether using this hub will limit the refresh rate of the monitor I'm not sure, but given that Displayport can support 4K (roughly 4x1080p) resolutions at 30hz then I think you should be fine for 2x1080 @120hz. You will want to still connect one of the monitors through the Dual Link DVI port though.
!