Is this an active or a passive cable?

I believe it is an active cable. Note the seller only offers the Thunderbolt 4 up to 2.0m which is the limit for the full 40Gbps on an active cable per Intel's specification. The vendor's advertisement suggests 40Gbps at all lengths they sell. I have had a good experience with my 2.0m cable; however, some screen flickering has occurred.

What kinds of speeds does this get when used on a Thunderbolt 3 device? Up to 40 gbps? Looking for a long cable that doesn't go down to 20 gbps.

This cable (in sizes up to 2 meters) does support USB 4, and Thunderbolt 3 or 4 data transfer speeds of up to 40GB/s. Keep in mind, other factors may impact your actual transfer rates. You'll only get up to 10 GB/s for USB 3.1. I have a couple of these OWC Thunderbolt cables and they work as advertised.

What is power delivery? Where is the power coming from and going to? Thanks.

The plug on one end to the plug on the other. In most cases, this will be from a Thunderbolt 4 enabled Apple computer to a Thunderbolt-enabled device, from a display to an external drive, to...some peripheral device, to which it will transfer power and data. The opposite, however can happen, since Apple laptops with Thunderbolt connections can be charged if this cable is connected to an appropriate charger and one of the T-bolt ports on the computer. This T-bold 4 cable works with the newest and fastest Thunderbolt-4 protocol that apple uses, but is backwards-compatible with any UBS-C or older Thunderbolt protocol device.

does this work to mirror display between two iMacs

Hello. Target display mode would be for iMacs between 2011-2014 which these macs have Thunderbolt 2 connections This would not be a cable you would use for target display.

Brand	OWC
Connector Type	USB 3.0, USB Type C
Cable Type	USB
Compatible Devices	Personal Computer, Tablet
Special Feature	High Speed
Compatible Phone Models	Samsung Galaxy S10
Recommended Uses For Product	Connecting electronic devices, data transmission, power delivery
Ethernet cable category	Cat 8
Colour	Black
Connector Gender	Male-to-Male
Data Transfer Rate	40 Gigabits Per Second
Shape	Round
Number of Pins	24
Frequency	40 GHz
AC Adapter Current	12 Amps
Net Quantity	1.0 Count
Item Weight	59 Grams
Model Name	OWCCBLTB4C1.0M
Specification Met	Csa, Ul, Thunderbolt Certified
Indoor/Outdoor Usage	Indoor, Outdoor
Number of Items	1
Customer Package Type	Flexible packaging
Wattage	240 Watts
Maximum Voltage	20 Volts
Outer Material	Plastic
Manufacturer	OWC
Country of Origin	USA
Model number	OWCCBLTB4C1.0M
Item Weight	59 g
Product Dimensions	22 x 8 x 3 cm; 59 g
Batteries	1 Lithium Ion batteries required.
Item model number	OWCCBLTB4C1.0M
Item Height	3 Centimeters
Item Width	8 Centimeters
Voltage	220
Are batteries included?	No
Lithium battery energy content	2 Kilowatt Hours
Lithium Battery Packaging	Batteries packed with equipment
Lithium battery weight	2 Grams
Number of lithium ion cells	5
Number of lithium metal cells	5

Thunderbolt 4 Cable, 1.0 Meter (3.28 ft.), 40 Gb/s Data Transfer, 100W Power Charging, Compatible With Thunderbolt 3, USB-C, and USB4 Devices, Black

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