can I connect a thunderbolt 3 device to a thunderbolt 1 computer port with this product?

Yes, it is compatible. According to the Startech web site, it is compatible with Thunderbolt 1 & 2. You can find this information on the Startech web site

Is there a product that does Thunderbolt 1 port on the computer to thunderbolt 3 devices? I have an Asus G75VX with Thunderbolt 1 port on it. I want to upgrade my graphics card using an eGPU device. But I cannot find any Thunderbolt 1 eGPU's so I need an adapter to make it work. Yes I know I will take a huge performance hit, but I am buying a high end threadripper computer and can't afford all of the pieces to start, so I figured I'd just get an eGPU to use my new video card on now.

Short answer, no. Thunderbolt 3 is backwards compatible with 1 & 2. Thunderbolt 2 is backwards compatible with 1. But none of them are forward compatible with devices that are designed for later versions.

Will this allow use of a thunderbolt monitor?

Yes, this adapter is compatible with first-gen Thunderbolt and Thunderbolt 2 devices, which includes Thunderbolt monitors.

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StarTech.com TBT3TBTADAP Thunderbolt 3 to Thunderbolt 2 Adapter - Backward Compatible - USB C to Mini DisplayPort - USB-C to Thunderbolt 2

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Use first-gen Thunderbolt and Thunderbolt 2 devices with a new Thunderbolt 3 computer
Thunderbolt 3 to Thunderbolt Adapter / Thunderbolt 3 USB C to Thunderbolt / USBC / Thunderbolt 3 USB Type-C to Thunderbolt
Compatible with first-gen Thunderbolt & Thunderbolt 2 devices
Supplies power for bus-powered devices
Thunderbolt Certified
Works with Thunderbolt 3 computers such as the latest models of Dell XPS & Dell Precision & MacBook Pro

Overview

Specs

Reviews (10)

Thunderbolt 3 to Thunderbolt Adapter Use legacy Thunderbolt devices with your new Thunderbolt 3 computer.

Best Seller Ranking	#9 in Thunderbolt Cables & Adapters

Model
Brand	StarTech.com
Model	TBT3TBTADAP
Type	Thunderbolt Cable
Color	Black

Details
Connector Number	2
Connector Detail	Connector A 1 - Thunderbolt™ 3 USB-C (24-pin) Male Connector B 1 - Thunderbolt™ 2 (20 pin) Female
Terminal Gender	Male to Female
Thunderbolt 3	Yes

Features
Features	Use legacy Thunderbolt devices with your new Thunderbolt 3 computer Thunderbolt 3 to Thunderbolt Adapter Thunderbolt 3 USB C to Thunderbolt Thunderbolt 3 USB Type-C to Thunderbolt Compatible with Thunderbolt 1 and Thunderbolt 2 specifications Peer-to-peer networking between older Thunderbolt laptops and newer Thunderbolt laptops Works with newer Thunderbolt 3 computers such as the latest models of Dell XPS & Dell Precision & more Guaranteed reliability with a 2-Year warranty

Group
Length	0.5 ft.

Additional Information
First Listed on Newegg	March 24, 2016

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 2 years
Limited Warranty period (labor): 2 years
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Return Policies

We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2025 and December 31, 2025 you will have until January 31, 2026 to return your product.

Return for refund until: January 31, 2026

Return for replacement until: January 31, 2026

This item is covered by Newegg.com's Extended Holiday Return Policy. Read full return policy for details.

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StarTech.com TBT3TBTADAP Thunderbolt 3 to Thunderbolt 2 Adapter - Backward Compatible - USB C to Mini DisplayPort - USB-C to Thunderbolt 2

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Manufacturer Contact Info

Item#: N82E16812400713

Best Sellers

StarTech.com TBT3TBTADAP Thunderbolt 3 to Thunderbolt 2 Adapter - Backward Compatible - USB C to Mini DisplayPort - USB-C to Thunderbolt 2

Learn more about the STARTECH TBT3TBTADAP

Customer Reviews of the STARTECH TBT3TBTADAP

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info