I just dropped the resolution to 1080p, which is 4 physical pixels per virtual pixel. Looks good enough, runs cooler/faster and doesn't show those funky control issues that crop up with scaling enabled.
[edit] Two guys in the office got 4k displays recently; one's on a Macbook Pro, other is on an HP linux i7 machine. Both of them spin the GPU fans at like 80% all the time. Mine purrs along at zero fan noise and ~4.5 hours of battery life. It's been a nice change.
Now playing: WoW (Garona)
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