To cope better with AMD 2nd generation Ryzen Threadripper processors, which come with up to four active dies on the MCM (multi-chip module), ASUS is giving away free Cooling Kits to owners of its socket TR4 motherboards, such as the ROG Zenith Extreme, ROG Strix X399-E Gaming, and Prime X399-A. The kits include a fan bracket that lets you strap a 40 mm fan onto your CPU VRM heatsink, and a so-called "SoC heatsink," designed to cool the SoC power phase MOSFETs (which now have to cope with the load of four SoC dies). The kit for the Zenith Extreme also includes a 10 mm-thick 40 mm fan, which plugs into one of your 4-pin PWM headers. The kit will neither be included with current or upcoming inventories of unsold X399 motherboards by ASUS. Customers who need it will have to contact their local ASUS office, which will verify the purchase of their ASUS X399 motherboard, and ship their kit for free.

There are two kinds of desktop CPU platforms. The mainstream tier runs from two cores up to eight, and it's great for gaming and general use. Its high-end sibling takes everything up a level with more cores, more memory channels, and more bandwidth for graphics and storage. A considerable upgrade in every regard, this high-end desktop platform appeals to power users, content creators, and prosumers who want to blur the line between desktop and workstation. AMD's Threadripper CPU is the latest addition to the desktop's heavyweight division, and it walks into the ring with an entourage of SocketTR4 motherboards in tow. This guide explains the ASUS and ROG family to help you pick the best X399 motherboard for your high-end desktop or gaming PC.

All of our X399 boards share core DNA that includes one-touch overclocking, refined cooling control, and improved RGB lighting. Yet they each have their own distinct flavor as well. The ROG Zenith Extreme brings Threadripper into the world of premium dream PCs with provisions for custom liquid cooling and 10G networking. With the Strix X399-E Gaming, hardcore gamers can build stylish rigs with power to spare for high-quality streaming. And then there's the Prime X399-A and its well-rounded foundation channeling the professional side of the platform's prodigious power. Which X399 motherboard should you buy for your build? Let's find out.