Is Amazon's cheap Thunderbolt 4 / USB4 cable okay?I tried 4K x 2 simultaneous output, 100W charging, and data transfer with 10 types of cables.

Test # 1: Can USB PD supply 5A?

First, check if it supports 5A supply in USB PD. A typical USB Type-C cable supports up to 3A and can supply up to 60W, but the Thunderbolt 4 cable supports 5A and can supply up to 100W.

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— Gjhgj Tue Oct 23 09:08:33 +0000 2012

It's easy to check, just connect a USB PD charger over 60W, for example a USB PD charger up to 65W, to your laptop and see if the utility recognizes it as 65W. If the cable is compatible with 3A, it will be displayed as 60W, so it is obvious at a glance.

This time, Anker's Thunderbolt 4 dock "Anker PowerExpand 5-in-1 Thunderbolt 4 Mini Dock" used for display verification, which will be described later, supports USB PD charging up to 85W, so we conducted an experiment using this.

This time I tried Anker's "Anker PowerExpand 5-in-1 Thunderbolt 4 Mini Dock" notebook PC that supports USB PD charging up to 85 W. Only in this experiment, Lenovo's utility is used, so the Thunderbolt 3 port is installed. I am using Lenovo `` ThinkPad X1 Carbon (2019)''

The results are as follows, and the result was that only [D-1] (RAMPOW RAD18), which was originally 3A, was 60W, and the others were 85W. Everything is perfectly as expected, and no cable seems to be spoofing specs.

[Table 2] USB PD verification results

number	Maker	Model number	kinds	Predict	actual
A-1	Cable Matters	107032-BLK-0.8m	Thunderbolt 4	85W	85W
A-2	OWC	OWCCBLTB4C0.8M	Thunderbolt 4	85W	85W
A-3	BODAM	4041-9104	Thunderbolt 4	85W	85W
B-1	Apple	MQ4H2FE / A	Thunderbolt 3	85W	85W
B-2	TREBLEET	TBCB-2	Thunderbolt 3	85W	85W
B-3	CABLETIME	CT-C160-U31-TB3	Thunderbolt 3	85W	85W
C-1	ELECOM	USB4-CC5P08BK	USB4	85W	85W
C-2	Cable Matters	201304-BLK-0.8m	USB4	85W	85W
C-3	Atlas	USB4-01	USB4	85W	85W
D-1	RAMPOW	RAD18	USB 3.1 (USB 3.2 Gen2)	60W	60W

If it supports 5A, it will be recognized as a power supply exceeding 60W on the utility, but at 3A it will stop at "60W".This property makes it easy to identify 5A / 3A compatible cables.