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hmm what does that actually mean, I have a GFX card which supports 4K (NVIDIA GeForce GTX 970), and the resolution is 4K (i.e. monitor is at native resolution).  And only raw viewer hangs, DOTA 2, Lightroom, Photoshop etc all run fine.  But I have might have forgotten to mention I have a dedicated GFX card :(. My GeForce driver is 372.70 and I am running it on a stationary PC.