I'm wanting to connect my old PC to my new iMac directly to transfer my files faster. I've been transferring via my wifi network. Will this work?

It will hook up your pc to your Mac via thunderbolt using an Ethernet cable. I am not sure about your Mac recognizing the connection

this adapter works for my Macbook Pro pretty well, but it does not work for my Air. I tried many times. I do not know where the problem is.

Which Macbook Air do you have? how to identify: http://support.apple.com/kb/HT3255According to Apple, only Air models 2011 and later will have Thunderbolt support. see:http://support.apple.com/kb/ht5299

Must it be a gigabit use only or can it work with any wired ethernet connection regardless of speed? If not, can I buy the USB-ethernet cable instead?

There is absolutely no reason to get thunderbolt, USB 2.0 goes up 450mbps with 300 being the typical peak. For comparison, the most common internet today only goes from from 20-50mbps. Most at home routers don't even support Local Area Networks to 300mbps, you're really only getting thunderbolt for the name really. Thunderbolt is overkill for this, a good use of a thunderport would be like hooking up a 4k resolution monitor that needs tons of bandwidth.

Is it compatible with a mac book air 2014 since it has a thunderbolt plug

If your Macbook Air have thunderbolt, it will be working.

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Thunderbolt Gigabit Ethernet Adapter

Product ID: 432107

Details

Color
White
Compatible Devices
Desktop
Connector Type
RJ45
Item dimensions L x W x H
2.64 x 0.79 x
Specific Uses For Product
personal

⚡40Gbps Thunderbolt speed

🌐Gigabit Ethernet RJ-45 port

📏Compact 6.1-inch design

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£16.93

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Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay wired, stay winning — the ultimate Mac networking upgrade!

PLUG PLAY SIMPLICITY - Instantly connect your MacBook Air or Pro with Retina display—no drivers needed, just pure efficiency.
SLEEK ULTRA PORTABLE DESIGN - Slim and lightweight, perfect for on-the-go professionals who demand speed without bulk.
RELIABLE GIGABIT ETHERNET ACCESS - Plug into any 10/100/1000BASE-T network for rock-solid wired internet performance.
BLAZING FAST THUNDERBOLT CONNECTIVITY - Experience ultra-low latency with 40Gbps Thunderbolt interface for seamless data transfer.
APPLE CERTIFIED QUALITY COMPATIBILITY - Engineered for macOS 10.7.4+ with trusted Apple build, ensuring flawless integration.

The Apple Thunderbolt to Gigabit Ethernet Adapter delivers high-speed wired connectivity for MacBook Air and MacBook Pro users. Featuring a compact design and a built-in Thunderbolt cable, it supports 10/100/1000BASE-T networks and requires macOS 10.7.4 or later. Ideal for professionals seeking reliable, ultra-fast internet access with Apple’s signature quality.

Specifications

ASIN	B008ALA6DW
Best Sellers Rank	#13 in Laptop Network Adapters
Brand	Apple
Built-In Media	Apple Thunderbolt To Gigabit Ethernet Adapter With Built-In Thunderbolt Cable
Color	White
Compatible Devices	Desktop
Connector Type	RJ45
Current Rating	1 Amps
Customer Reviews	4.4 4.4 out of 5 stars (6,138)
Global Trade Identification Number	00885909561247, 09154400820247
Item Dimensions	2.64 x 0.79 x 6.1 inches
Item Part Number	MD463ZMA
Item Weight	0.04 Kilograms
Manufacturer	Apple
Mfr Part Number	MD463ZM/A
Model Number	MD463ZM/A
Number of Items	1
Number of Ports	1
Package Quantity	1
Specific Uses For Product	personal
UPC	885909561247 638845662154 719936420164
Unit Count	1.0 Count

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