Samsung S27A850TS 27" Widescreen Ultra Thin LED

What cable are you using to drive it? Have you updated the GPU drivers? Have you tried downloading the monitor's drivers?

I have this exact monitor as a secondary and it works fine with 2560x1440.
 
hdmi, gpu drivers are up to date. where would i download the monitors drivers?

edit: says my drivers are up to date in device manager, but recognises it as 'generic PnP monitor'
 
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Ah sorry i see you said HDMI well that is your problem then max resolution via HDMI on that monitor is 1080p you will need to use a DVI cable or DP cable to get 1440p:)
 
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gfx card: gtx970

yeah i have a dvi cable and have tried using it, but i only get a blank screen.
not really sure what that means. no display port cable to hand perhaps i should get one tommorrow to see if that works
 
gfx card: gtx970

yeah i have a dvi cable and have tried using it, but i only get a blank screen.
not really sure what that means. no display port cable to hand perhaps i should get one tommorrow to see if that works

If anything like the 32 Samsung, it won't automatically flip to the new input so you need to use monitor buttons to manually change input.
Also I found that turning off the monitor and Pc, then turning both on again helped when I was using different cables (shouldn't be necessary, but one time my monitor got confused)
 
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