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hayder1983 Be aware that for the Samsung 2494HM the AV mode needs to be set to off as otherwise it does a digital overscan. Contrast may look worse at first but that's due to it resetting gamma and brightness values. Sharpness can be 56 or 60 for a neutral value and I personally use gamma 1 or 3 and keep magicolor off. Your GPU driver might also set the output range to Limited so you can change that to Full then change the HDMI Black Level on the monitor to Normal.
I've also switched it to my primary monitor. I don't even care anymore, the only competitive game I play it doesn't make a huge difference to play at 60Hz.
Going back to the Samsung 2494 I do still get some occasional strain but there is no serious burning feeling or headache that develops. It is definitely the least amount of any desktop monitor I have tried so it's a good baseline. There is one thing I am looking into which is the color of the drapes I have behind my monitor. I use dark grey drapes and will be trying out some drapes that are the same off-white as my wall, which is the backdrop color behind my wall-mounted TV. It's at least worth giving a shot to see if backdrop color makes a difference.
I've used the same computer for all of the monitors I've talked about including the ones I like but I will keep that in mind.