In my case setting hdmimhz=297 did the trick.
Hardware:
01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 650M
Mac Edition] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Apple Inc. GK107M [GeForce GT 650M Mac Edition]
Flags: bus master, fast devsel, latency 0, IRQ 35
Memory at c0000000 (32-bit, non-prefetchable) [size=16M]
Memory at 90000000 (64-bit, prefetchable) [size=256M]
Memory at a0000000 (64-bit, prefetchable) [size=32M]
I/O ports at 2000 [size=128]
Expansion ROM at c1000000 [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: nouveau
Kernel modules: nvidiafb, nouveau
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https://bugs.launchpad.net/bugs/1655421
Title:
nouveau driver being too conservative about HDMI pixel clock, barring
usage of native resolution on 4K displays over HDMI
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