Extending monitor cable. Advice needed.

[sacentre]

I have a Dell U2711 running off a Radeon R9-270X using the 2-meter Dell supplied DVI-D dual link cable which works fine at 2560x1440 resolution.

All I want to do is extend the video cable to 3 meters.

I tried 4 different 3-meter DVI-D dual link cables but none of them would support 2560x1440.

Next, I tried a 3-meter HDMI v1.4 cable but again, this would only support up to 1680 x 1050.

Lastly, I tried the Dell supplied 2-meter DisplayPort cable which will support 2560x1440 but this caused the monitor screen to go black every 15 or 20 minutes for a second or so.

The only cable that works correctly is the short Dell DVI-D cable. I'm very frustrated with this situation. Can anyone advise what I'm doing wrong?

Thanks

Trevor

 

[clutchc]

Are you saying a cable like this: http://www.amazon.com/eForCity-POTHDVIX6F01-Gold-Plated-Digital-9-9Gbps/dp/B000E8SY5G
Dual Link, DVI-D, 2560x1440 rated at 9.9Gbps will not work?

I wouldn't think you'd need a KVM switch for 10', but that may be the case.
http://www.amazon.com/s/ref=sr_kk_1?rh=i%3Aelectronics%2Ck%3Akvm+dvi&keywords=kvm+dvi&ie=UTF8&qid=1389301588
I've never used one, so I'm going to bow out if that is the case, rather than steer you wrong.

 

[sacentre]

Thanks for the reply, clutchc

I have no idea about that cable and since Amazon won't ship to Singapore, I can't order one to find out. Anyway, it's only a 6ft cable and as I said, the Dell one works fine. I need a 10ft one.

However, having tried 6 different cables now (all 3M long) I'm reluctant to throw any more cash at cables until I have a clearer idea of what the problem is.

Thanks

Trevor

Are you saying a cable like this: http://www.amazon.com/eForCity-POTHDVIX6F01-Gold-Plated-Digital-9-9Gbps/dp/B000E8SY5G
Dual Link, DVI-D, 2560x1440 rated at 9.9Gbps will not work?

I wouldn't think you'd need a KVM switch for 10', but that may be the case.
http://www.amazon.com/s/ref=sr_kk_1?rh=i%3Aelectronics%2Ck%3Akvm+dvi&keywords=kvm+dvi&ie=UTF8&qid=1389301588
I've never used one, so I'm going to bow out if that is the case, rather than steer you wrong.

 

[manofchalk]

My bet is that quite simply HDMI/DVI werent intended to run for that distance (with that resolution) and your getting signal degradation. Wikipedia seems to indicate that a DVI cable can run for 4.6m while still supporting 1080p, obviously it might be less since your trying 1440p.

You need some way to boost or repeat the signal.

 

[sacentre]

Hi manofchalk

I started out with that assumption but read so many reports of users claiming to have run that res with this or that cable.

The Dell DP cable works ok at 2 metres apart from the screen blanking which would appear to be another problem separate from the cable.

Thanks for the reply
Trevor

My bet is that quite simply HDMI/DVI werent intended to run for that distance (with that resolution) and your getting signal degradation. Wikipedia seems to indicate that a DVI cable can run for 4.6m while still supporting 1080p, obviously it might be less since your trying 1440p.

You need some way to boost or repeat the signal.