Question 1

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

Accepted Answer

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

Question 2

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.

Accepted Answer

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.

Question 3

Will this allow use of a thunderbolt monitor?

Accepted Answer

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

Brand	StarTech.com
Model	TBT3TBTADAP
Type	Thunderbolt Cable
Color	Black

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

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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Item#: N82E16812400713