Anyone tried 2017 5K with 2 displays: LG 5K and 1440p?

apple's specs can plug lg 5k imac , should both fine @ 5k.

has tried adding 1440p on top of this? e.g. via other tb3 port (say, tb dock outputs displayport)?

edit:

did quick research (prob not accurate).

assuming billions of colours means 10-bits per pixel, , apply colour depth factor of 1.2 , coefficient of 10

(according apple):

one 5120‑by‑2880 (5k) external display @ 60hz support 1 billion colours
per calc be:
5120 x 2880 × 60 × 1.2 × 10
10.62 gbps per channel
31.85 gbps total (rgb)

within 40gbps tb3 limit.

checking maths again:

two 3840-by-2160 (4k uhd) external displays @ 60hz support 1 billion colours
per calc be:
3840 × 2160 × 60 × 1.2 × 10 (x2)
11.94 gbps per channel
35.83 gbps total (rgb)

within 40gbps tb3 limit.


so proposing be

((5120 x 2880 × 60) + (2560 × 1440 × 60)) × 1.2 × 10
13.27 gbps per channel
39.81 gbps total (rgb)

close....but on 40gbps of tb3 given maths isn't @ accurate.

 

your logic sound unfortunately there separate limitation.

while 2017 imac has 2 thunderbolt 3 ports, these driven single alpine ridge controller (by comparison, 15" macbook pro has two).

each controller can drive 2 displays - , limitation. lg 5k counts 2 displays because picture formed of 2 4k images.

there therefore no displayport lanes left on additional displays, despite total tb3 bandwidth availability not being exceeded.

@ least, understanding, not expert , gladly proven wrong.

 

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