Ethernet Cables

I challenge anyone claiming differences in ethernet cables passing packets. There can be zero differences because a bit is a bit. Bits just don’t get dropped or we would not have communication over the internet.

I don’t think this is the real issue on this thread. The different ethernet cables are transfering bits from the source. No argument here.
The destination is the audio system and the intent is to prevent noise, mostly caused by RF interference, from getting into the audio signal.
The signal distributed from a cable company which hooks up to our modem/routers is full of RFI, some ethernet cables are better than others in transfering clean data. Supra CAT8’s conductors are individually shielded which helps reduce interference/ noise from being delivered to the destination.
The major source of this RFI in our homes is the router.
Using CAT8, I experienced a lower noise-floor from my streamer than when using CAT6.

Looking to reduce this noise further, I went to the source and added RFI/EMI filtering at the router. My streaming playback has been greatly improved.
Using an RF "sniffer" device indicates no RFI coming from the router into my audio system.

If they didn’t work, why would people spend $100s on Ethernet cables, and why would people make them. There must be something better about those expensive cables to justify the price. Also, maybe you can’t hear the difference but at least with one of those expensive cables you can relax and rest assured in the knowledge that at least your ethernet cable is not a source of degradation in your system. 

SotM Ethernet cable. Destroyed an AQ Diamond between my MSB Signature Transport and DAC

Sablon is very good in my experience, superior to other more well known brands, low noise floor. It’s only possible issue is it’s extremely stiff.

@lxgreen I read the Nordost paper and it is absolute jibberish. At no point do they mention even one quantitative measure or threshold of impact of any cable characteristic - impedance, capacitance, inductance RF sensitivity or any other measure. Nor do they discuss the fact that TCP/IP and USB are asynchronous protocols immune to timing issues. Or that TCP/IP has bit error correction so that any corrupt or dropped packet is retransmitted. They fail to mention perhaps the most salient point of all: 100% of streaming services are buffered by the receiver and played back out of the buffer after CRC checksums and packet order is assured.  Audio is a very light network load - a few hundred Kbits/sec to a few Megabits/Sec. All the packet buffering, error correction, and re-ordering is happening at 100 or 1000 Mbits/sec - at least 10X faster than the streaming service can throw it at you. So, yes it all happens in realtime and at line speed, and your network, wired or wireless is not breaking a sweat.

And if there is noise, RF (EMI) or whatever, like one might have in an industrial environment, shielding can help, and foil and braided shielding can help a lot,  but ONLY if a proper grounding scheme is implemented, and only if there's noise in the environment in the first place. Pro Tip: Plug&Play is not a proper grounding scheme. And if your line in is carrying RF, the only way to get rid of it is with an optical isolator (not an Ethernet surge suppressor), not a $500 cable.