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ASUS GTX 680 DCU II TOP - NO 120HZ or 3D with BenQ XL2420T

mkelbie
Level 7
Anyone got any ideas why my GPU has randomly decided to stop allowing 120hz or 3D? I have been having a nightmare with my X79 system if I am being honest but recently I stripped it down rebuilt it with a clean install latest drivers and initially I am sure that I could choose 120hz but now it will not allow it.

I can however force a custom resolution of 1920*1080@120hz but this is undetected/unsupported for games & 3D.

Also if I lower my resolution to 1280*720 it will allow 120hz (not focred/custom) but again this still will not allow 3D vision to be setup.

Any suggestions or ideas? Cable is definitely dual link as it came with monitor and worked initially, I have also tried a HDMI 1.4 cable but that was unsuccessful too.

Thanks
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12 REPLIES 12

mkelbie
Level 7
Just done a clean install of Windows 7 to rule out windows 8 being at fault.

Drivers for monitor and GPU are both the same for W7 and W8 and surely if my cable has developed a fault it wouldn't work full stop and not allow 720p @ 120hz?

I have windows 7 x64 SP1 clean install with nvidia driver and Windows's update doing the rest and it still won't work so I must be doing something wrong

Zka17
Level 16
When a graphics driver suddenly stops to work properly usually means that they got an update... I've learned that it's never good to let the Nvidia driver on auto updating... - can you check if recently has auto-updated itself? If so, try to go back to the previous version...

mkelbie
Level 7
Autoupdate isnt on, and I have been using 310.90 for a while and using 120hz.

I have a clean install now on W7 and its not having it :@

Anyone know if a dual link cable can work in single link? seems like not enough badwidth given that 720p 120hz works.

Anyone any ideas? I am back running windows 8 now as its the OS I prefer.

Still only 60hz and tried a few different things. It must be driver/software related but I can't say for sure, but I think if the GPU Cable or Monitor was faulty they wouldn't work at all. I am snowed in and wanted to do some gaming this weekend but don't want to continue installing steam and rest of my software until I know its sorted.

only the bottom dvi on the 680 dcii top is dual-link, make sure to use this one coupled with the dual-link cable that was supplied with monitor

RonanC wrote:
only the bottom dvi on the 680 dcii top is dual-link, make sure to use this one coupled with the dual-link cable that was supplied with monitor


Bottom do you mean the one on its own? Not on the same row as DP & HDMI? I have now connected it to that but it still doesn't allow 120hz. But I am 99% sure I have had it on the top DVI and it worked previously @120hz.

16363

sectionate
Level 12
you need to be using a dvi-d cable to pass 120hz
Crosshair IV 1090T 4093.7 - Crosshair V FX - 8350 Batch # 1243PGT 4.422MHz - 4816.08 MHz 1.5v - GSKILL F3-14900CL9D-8GBSR(x2)1087.6 11-12-10 1.5volts - ViewSonic VX2439wm - Acer GD235HZ - SyncMaster P2350 - PowerColor Red Devil RX 480 8GBD5-3DH/OC - Current Mode: 5760 x 1080 - (retired) ASUS GTX660DC2O2GD5 - Nvidia 3D Vision Wired - HAF 932 - Corsair HX850 - Corsair H100i - latest quakelive.com - Day thirteen 60fps - as always I'm powered by Futurelooks.com

I am using a dual link cable. its the same cable I got with the monitor new and originally worked.

No hardware has changed so cant understand why its no longer working.

HalloweenWeed
Level 12
You aren't using the OC key, are you?
i7-3930K; Asus RIVE; G.SKILL Ripjaws Z 4x4GB DDR3 1866; MSI 7870 2GD5/OC; Crucial M4 SSD 256GB;
Corsair 1000HX; Corsair H100, 4x Excalibur 120mm PWM CPU Fan p-p, AS5; SB X-Fi Titanium Fata1ity Pro;
Dell U2412m IPS 1920x1200; Cooler Master HAF 932 case; Tripp-Lite OMNIVS1500 UPS fully Line-interactive.
(EVGA site: ) And I have a second (wife's) computer, Eve.

Overclocking is useless to me if it is not rock stable.