TB3 cable behaving strangely
I'm connecting the MBP to the BM with a 2m Chotech tb3 cable bought from amazon. From the egpu to the dell is a 1m tb3 cable ( https://www.amazon.co.uk/gp/product/B085VZ3J4D/ ). This is working well and I can play 8k video with no stutters. I use the Nasa video as a test.
When I swap the cables around, so the Chotech is between the egpu and the monitor, I get no signal on the monitor. The MBP sees the eGPU though and it charges.
I thought the chotech cable had failed so I bought another one and I got exactly the same behaviour.
Any thoughts as to why that might be the case? Could it be to do with the power supplied by the BM?
And if I buy a different 2m cable will I get the same results?
Thanks in advance for any help
An update on this. The Cable Matters 40gbps/100w cable behaved in exactly the same way. I suspect it's to do with the output signal from the balckmagic not being capable of driving a 2m cable. I don't know if that's a thing though.
Anyway, I returned all the 2m cables (£180 worth of cabling!) and will get another cable matters 1m. I'll just have to shuffle things around a little.
Apple has a new Thunderbolt 3 Pro Cable (2m). It's different from other 2m cables because it supports both Thunderbolt and USB-C devices (USB 3.1 gen 2 and DisplayPort signals).
The Sonnet box comes with a eGFX Breakaway is a 1.5' (0.5m) Thunderbolt 3 cable. I think I read that longer cables will be a problem if used between the Mac and the eGPU.
I'll have a look at the Apple cable, thanks.
And I'll look into a 1.5m cable, that's a good idea.
As I said, the problem isn't between the mac and egpu, that seems to work whatever cable I use. The problem is between the egpu and the monitor.