susanNM
1 Copper

Dual 2560 x 1440 resolution monitors with Radeon HD 7750 DUAL HDMI 1GB graphics card

I bought this graphics card on advice of  a dell chat session.  My request was ability to drive TWO 2560 x 1440 resolution monitors on my Studio XPS 8100.

"1 x Radeon HD 7750 DUAL HDMI 1GB"

It has worked great with a single monitor so I bought the second high res monitor and I am dismayed to find that the graphics card only supplies high resolution to one of them.  The other is 1920 by 1080 and because that is not the native resolution of the monitor the image is poor.

Is there something I can do to get the image quality I expected, or is this graphics card limited to only one 2560 x 1440 monitor?


I'm so disappointed!

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17 Replies
ieee488
5 Rhenium

RE: Dual 2560 x 1440 resolution monitors with Radeon HD 7750 DUAL HDMI 1GB graphics card

Are you using the mini Display Port to drive both your monitors?  

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susanNM
1 Copper

RE: Dual 2560 x 1440 resolution monitors with Radeon HD 7750 DUAL HDMI 1GB graphics card

I'm using the two HDMI ports.

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ieee488
5 Rhenium

RE: Dual 2560 x 1440 resolution monitors with Radeon HD 7750 DUAL HDMI 1GB graphics card

You may want to contact Visiontek to confirm. They make the board.

There is no mention of the display specifications for that board is capable of what you want. Dell may have been thinking you only wanted 1920 X 1080.

A similar board https://www.visiontek.com/graphics-cards/visiontek-7750-3m-4k-uhd-three-monitor-graphics-card-detail... shows that the HDMI for this graphics card is 4K capable.

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susanNM
1 Copper

RE: Dual 2560 x 1440 resolution monitors with Radeon HD 7750 DUAL HDMI 1GB graphics card

This was my request (I already had two 1920x1080 monitors):


"I would like to upgrade my video card to drive two 2560 x 1440 resolution monitors."


I think I found the manual on the visiontek site under product category "7750 HDMI Audio". 

It says

"Supports 2xHDMI(1.4a) port and DisplayPort 1.2 @2560 x 1600 resolution"


I'll pursue this with VisionTek and report back.  Thanks for pointing me in the right direction.

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ieee488
5 Rhenium

RE: Dual 2560 x 1440 resolution monitors with Radeon HD 7750 DUAL HDMI 1GB graphics card

Yes, please update when you hear from VisionTek.

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susanNM
1 Copper

RE: Dual 2560 x 1440 resolution monitors with Radeon HD 7750 DUAL HDMI 1GB graphics card

Woot!

After 3 hours of reinstalling drivers and Catalyst software and rebooting and fiddling with conceivably relevant video-related settings and swapping monitors, I got a cryptic message that "an HDMI to DVI connection was detected".  I had two HDMI connections, so that was odd.  I pulled one of the HDMI connections and used the DP connection instead.  Now I've got 2 2560x1440 displays.


Thanks for your help.

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ieee488
5 Rhenium

RE: Dual 2560 x 1440 resolution monitors with Radeon HD 7750 DUAL HDMI 1GB graphics card

Excellent news.

So are you running DP to DP or DP to HDMI?

I would still be interested to know whether dual HDMI was possible.

The card is suppose to support 3 monitors.

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susanNM
1 Copper

RE: Dual 2560 x 1440 resolution monitors with Radeon HD 7750 DUAL HDMI 1GB graphics card

One monitor HDMI to HDMI.  The other DP to DP.


I did manage three monitors before, but it dropped the resolution of all monitors to HD.

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susanNM
1 Copper

RE: Dual 2560 x 1440 resolution monitors with Radeon HD 7750 DUAL HDMI 1GB graphics card

Final update.  I got an email from VisionTek this morning saying I should update my drivers, and they forgot to include a link.  I asked for the link.  Of course I'd done driver update from within the OS, but this prompted me to search on their website.  I uninstalled the old Catalyst and installed new Catalyst + drivers.  Then I got an email with a completely different driver page and completely different software on it.  Uninstalled again and installed the completely new software from the new link.  All was well.  Then I switched to using two HDMI-HDMI cables and everything looks good.


That's a lesson learned for me.  Hit tech support early and often, I guess.  There's lots of cruft on the internet.

This is the link sent me by VisionTek support:

http://support.amd.com/en-us/kb-articles/Pages/AMD-Radeon-7000-Series-Drivers.aspx

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