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Przepraszam
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Location: Poland. New York.
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 Posted: Wed, 20th Feb 2013 04:42 Post subject: Dell U2713HM + 7950 no 2560x1440 |
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Hello. I need some assistance from you good folks on humps.
My friend recently bought Dell U2713HM and he had SAPPHIRE FleX Radeon HD 7950. So, monitor was delivered today and we used to cable that came with the monitor which is DVI-D, we connect it but only resolution available is 1920x1080 ;\
Oddly enough, we try it on my system, it work OK. Swapped cables between two monitors and they all work fine on my system.
Later on, we decided to connect my Crossover 27Q to his system and bam, it's not register 2560x1440 resolution at all, screen is just black.
Is there something wrong with video card? We use latest non-beta drivers 13.1
Could this be bad port on video card? Or somewhere in settings? But I could not find anything in the settings that would could be the culprit except the dvi port on the videocard
thanks
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| Posted: Wed, 20th Feb 2013 07:57 Post subject: |
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There is one single link DVI port and one dual link DVI port.
You are likely plugging the cable into the single link port which doesn't carry enough bandwidth for 1440p.
If that isn't the case my only other advice is get a cheap displayport -> dual link DVI adapter and see if that works.
Shouldn't need to do that though.
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Werelds
Special Little Man
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Location: 0100111001001100
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| Posted: Wed, 20th Feb 2013 12:20 Post subject: |
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Yep. DVI Single Link doesn't go up that high, you need to use DL DVI, HDMI or DP.
It's easy to recognise the Dual Link port: it has a full block of pins, rather than two blocks of nine with an empty block between them. The 4 pins on the side next to the horizontal spacer don't matter, they're for analog signals 
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Przepraszam
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Location: Poland. New York.
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| Posted: Wed, 20th Feb 2013 15:15 Post subject: |
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This is the cable we are using, which is DVI-D and it goes directly to 7950 DVI-D port :/
Like I said, both monitors work fine on my system and both monitors do not display the resolution on his system :/ |
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Werelds
Special Little Man
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Location: 0100111001001100
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| Posted: Wed, 20th Feb 2013 15:19 Post subject: |
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Przepraszam
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Posts: 14517
Location: Poland. New York.
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| Posted: Wed, 20th Feb 2013 15:27 Post subject: |
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Positive. 3 rows of 8 pins. With single dash.
I mean. We tried same cable that is connected to my Crossover 27Q. So I know the cable is good, because it shows correct resolution on my system.
But on his, is one big negative on this one :\
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| Posted: Wed, 20th Feb 2013 17:53 Post subject: |
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You haven't stated yet if you simply tried plugging it into the other DVI port present.
And FYI, the dual link port on that card is a dual link DVI-I, not D.
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Przepraszam
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Location: Poland. New York.
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| Posted: Wed, 20th Feb 2013 18:46 Post subject: |
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That is correct, we did not tried to plugging in it to DVI-I port.
I will let him know and when he gets off work in few hours, he will try that and report back to me.
I just read specs and it says
1 x Single-Link DVI-D
1 x Dual-Link DVI-I
So yes, DVI-D port in this card is Single-Link
I figured since my 660TI both DVI ports are Dual-Link, not sure why this card is madel like this
So, plugging DVI-D cable to DVI-I port is not an issue?
I just tried on my 660TI and it's not an issue.
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Werelds
Special Little Man
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Location: 0100111001001100
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| Posted: Wed, 20th Feb 2013 19:17 Post subject: |
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| Przepraszam wrote: | | So, plugging DVI-D cable to DVI-I port is not an issue? |
No, it isn't. DVI-I is just Analog + Digital in the same connector, it's basically DVI-A+D.
And on your 660Ti they're not both DL; only the DVI-D port is. At least that's the case on standard 660's. The reason they're not both DL is because DVI requires an extra bit of hardware for every channel they add, which is relatively expensive. Same reason you never got 4 DVI ports on a videocard, it's just too expensive and costs too much space on the PCB. |
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| Posted: Wed, 20th Feb 2013 19:17 Post subject: |
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Not an issue. A dual-link DVI-D cable simply can't carry the analog signal if present. A dual link DVI-I is the best of both worlds as it supports the highest bandwidth for digital applications, and also has the 2 extra wire pairs for the analog.
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| Posted: Wed, 20th Feb 2013 19:22 Post subject: |
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| Werelds wrote: | | Przepraszam wrote: | | So, plugging DVI-D cable to DVI-I port is not an issue? |
No, it isn't. DVI-I is just Analog + Digital in the same connector, it's basically DVI-A+D.
And on your 660Ti they're not both DL; only the DVI-D port is. At least that's the case on standard 660's. The reason they're not both DL is because DVI requires an extra bit of hardware for every channel they add, which is relatively expensive. Same reason you never got 4 DVI ports on a videocard, it's just too expensive and costs too much space on the PCB. |
Not true actually. On vanilla Kepler cards both DVI's are dual link. Only one is DVI-I for the legacy VGA support.
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Przepraszam
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Location: Poland. New York.
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| Posted: Wed, 20th Feb 2013 19:23 Post subject: |
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Thanks! I have let him know and he will report back to later on tonight if that was the case. Let's hope that was the case.
So if my MSI 660TI does not have both ports DL, then why both ports give me correct resolution of 2560 x 1440? Unless I am missing something basic in here. All the reviews mention that DVI ports are indeed Dual-Link.
But regardless, I really hope that was case, that we did not tried DVI-I port last night, guy spent $650 on monitor and we tried to troubleshoot it for 2hrs and never once I could think that DVI-D on 7950 is actual Single-Link
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Werelds
Special Little Man
Posts: 15098
Location: 0100111001001100
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| Posted: Wed, 20th Feb 2013 19:37 Post subject: |
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| Mchart wrote: | | Not true actually. On vanilla Kepler cards both DVI's are dual link. Only one is DVI-I for the legacy VGA support. |
Hmm, thought that was only for GK104 (both being DL I mean)? |
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Przepraszam
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Posts: 14517
Location: Poland. New York.
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| Posted: Thu, 21st Feb 2013 14:09 Post subject: |
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Yes, that did worked.
<--------------- noob.
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Werelds
Special Little Man
Posts: 15098
Location: 0100111001001100
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| Posted: Thu, 21st Feb 2013 14:28 Post subject: |
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Haha 
Blame the Digital Display Working Group for the confusingness that is DVI! 
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