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What is going on with my monitor!? help appreciated

post #1 of 17
Thread Starter 
So I have had some time to tinker with my compter the last couple of days and I decided to try and get the most out of my hardware now that its getting old and have been cranking everything to max. Today I noticed something strange regarding refresh rates and display connectors.
I have a BenQ RL2450H monitor manufactured september 2012. It has dual link DVID-D and HDMI inputs. I cant find any official specifications for the HDMI input on the monitor, but after a little bit of research I came to the assumption that because it is from 2012 that it would be a HDMI 1.4 connector. Using HDMI I am able to create a custom resolution in NVIDIA Control Panel with refresh rate of 75Hz. Without knowing the exact bandwidths of types of cables I thought that I might not have actually been displaying all 75 frames because my version of HDMI might not be good enough.
Today I went and bought a dual link DVI-D 24+1pin cable to make sure I had all the required bandwidth. Now when I set a custom resolution it only allows me to set up to 65Hz before the screen goes black and my monitor tells me 'out of range'. I then plugged in my old single link DVI-D and had the same result. To me it seems like something may be registering the dual link cable as a single link cable and restricting the output.
Does anyone know why it wont let me set 75Hz refresh rate using the new dual link cable? Is there a setting to tell the computer you are using dual link and not single link or something like that? And if I am better off using HDMI then whats the maximum refresh rate at 1080p over HDMI 1.4 (if that is even the correct version?)



post #2 of 17
Thread Starter 
So I have a hunch that I may have been sold a fake dual link cable where the extra six pins arnt connected. Hence why I cant set the refresh rate any higher than when using the single link cable.
post #3 of 17
You could use a multimeter to check the resistance between the pins on both ends. smile.gif
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post #4 of 17
Thread Starter 
Quote:
Originally Posted by fragamemnon View Post

You could use a multimeter to check the resistance between the pins on both ends. smile.gif
im going to pick one up off a mate tomorrow and test it. If it is fake the store will definitely be hearing from me!
post #5 of 17
Thread Starter 
So I tested the cable today using a multi-meter and the cable is genuine dual link. So now I am stumped as to why I can not set the monitor refresh rate as high as when im using a hdmi cable?
post #6 of 17
Quote:
Originally Posted by mastablades View Post

So I tested the cable today using a multi-meter and the cable is genuine dual link. So now I am stumped as to why I can not set the monitor refresh rate as high as when im using a hdmi cable?

The EDID, scalar and how the monitor is a bit different for each video input. You may get all different results (including refresh rate, resolution image and color quality too) from any of the monitor's video input.
 
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post #7 of 17
Thread Starter 
Quote:
Originally Posted by Peter Nixeus View Post

The EDID, scalar and how the monitor is a bit different for each video input. You may get all different results (including refresh rate, resolution image and color quality too) from any of the monitor's video input.

Thanks for your response. So there is nothing I can do to force a higher refresh rate through the DVI connection? If not, then what would be the best cable for me to use? From my research, although I can set 75Hz in NVIDIA control panel using HDMI, the maximum refresh rate supported by HDMI is 1080p @60Hz. So then I would be better off using dual link DVI set at 65Hz because it can actually display 1080 @65Hz, correct?
post #8 of 17
Quote:
Originally Posted by mastablades View Post

Thanks for your response. So there is nothing I can do to force a higher refresh rate through the DVI connection? If not, then what would be the best cable for me to use? From my research, although I can set 75Hz in NVIDIA control panel using HDMI, the maximum refresh rate supported by HDMI is 1080p @60Hz. So then I would be better off using dual link DVI set at 65Hz because it can actually display 1080 @65Hz, correct?

Maybe - even though the monitor scalar and EDID reports that to your GPU and OS, the panel may not support it. For example I am validating a new 32" 4k Panel that has a max resolution of 3840x2160 60Hz, BUT the scalar and EDID for all three HDMI ports is reporting 4096x2160 @75Hz while DisplayPort input is reporting 3840x2160 @ 86Hz. Windows Display settings show a recommended 4096x2160 resolution when I have it to a multi-monitor setup. But when I set that resolution or try to run the 4K monitor by itself it gets artifacts and not usable while changing refresh rates on HDMI causes my PC to reboot. I had to update the firmware to configure the EDID and Scalar to default at 3840 x 2160 @ 60Hz for all the HDMI and DisplayPort to resolve artifact issues.

So what ever is the safe setting you can use, use it - just make sure you have a secondary back up monitor when that monitor you are configure gives you artifacts, so you can try to revert it back. Believe it or not, good panels/scalar ASIC there are a lottery for those too - which is why some monitors you can OC to higher stable Hz.

Keep in mind though, with any OC or operating outside of factory specifications it may generate heat and/or degrade the life of your monitor hardware.

If you are trying to get higher Hz on DVI, I suggest try getting a Dual Link DVI cable with 28AWG or 24AWG (the lower the number the more copper there is in the cable) to support higher refresh rates/resolutions and make sure the cable is max 6 feet.

Then again, this is Overclock.net forum - so good luck! thumb.gif
Edited by Peter Nixeus - 7/12/16 at 8:41pm
 
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post #9 of 17
Thread Starter 
how do you configure the EDID and scalar?
post #10 of 17
Quote:
Originally Posted by mastablades View Post

how do you configure the EDID and scalar?

You can't unless you are a monitor manufacturer or have non-public equipment.tools... I'm just giving you an example of one of my experiences when validating and developing monitors that may relate to your experience = issues I have to fix before releasing a monitor to mass market.
 
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My Girlfriend #3
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MouseMouse PadAudioAudio
Nixeus REVEL PMW3360 Gaming Mouse ROCCAT SENSE Nixeus ARC 4.0 Bluetoth Speakers (Prototype) Nixeus Rival Headphones (Prototype) 
CPUMotherboardGraphicsRAM
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Samsung 830 SSD 128GB Seagate Barracuda 1TB 7200RPM NZXT Kraken X31 Water Cooler Windows 8.1 
MonitorKeyboardPowerCase
Nixeus Vue 27" IPS LED 2560x1440 DisplayPort MA... Nixeus MODA Mechanical Keyboard - Brown Switch ... Enermax Triathlor 550W Modular PSU Cool Master Elite 130 Mini-iTX Case 
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Nixeus Vue 27" H-IPS 2560x1440 WQHD Monitor NX... Nixeus MODA Mechanical Keyboard - Brown Switch ... OCZ Fatal1ty Modular 550 Watt Modular PSU Roswill Challenger-U3 Mid-Tower ATX Case 
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