Yes they are solid reds, real RGB.
After all, these are inside the HDMI 1.4 bandwidth spec.
I read on an article:
HDMI Bandwidth is rated in Gigabits per second.
HDMI 1.0->1.2: ~4 Gb
HDMI 1.3->1.4: ~8 Gb
HDMI 2.0: ~14 Gb (NEW)
[...]
A second of 1080p 8bit 60FPS data requires ~3 Gb of bandwidth, well within the range supported by the original HDMI 1.0 spec (though why we even had to deal with 1080i is a good question, probably due to the inability to even meet the HDMI spec).
To compare, a second of 1080p 12bit 60FPS data requires ~4.5 Gb of bandwidth. Even 1080p 16bit 60FPS needed only ~6 Gb, well within the range supported by HDMI 1.3 (where Deep Color was introduced). Plenty of headroom still. Only when we push 2560×1440 12bit 60FPS (~8 Gb) do we hit the limits of HDMI 1.3.
So, 10bit 1080p @60Hz is way below the top limit bandwidth of 1.4.
No way on UHD instead...
I could try with 6G SDI with a SDI-HDMI 2.0 adapter, but it's a lot pricey, still limiting to UHD@30Hz. At that point it's better to buy an Extreme 12G...