Sporting five PCI Express x16 slots and as many as four M.2 connectors, the X299 Aorus Gaming 9 is well-equipped to be the backbone of a stunning Intel Core X gaming PC.

The price may seem daunting, but this ROG Core X-Series mainboard delivers the goods, including multi-GPU support, two M.2 connectors, and customizable RGB LED bling.

If you're building around Intel's new Core X CPUs on a budget, MSI's X299 SLI Plus is worth checking out. The board delivers solid features and even a little style without going overboard.

Biostar gives budget-minded gamers a solid MicroATX option for AMD Ryzen with the Racing B350GT3. Sporting the capable B350 chipset and RGB light-strip headers, the board keeps things fun without sacrificing its strongest selling point: its sub-$99 price.

Gigabyte aims for gamers with this LED-swathed mobo for Ryzen processors. It features the SLI-capable X370 chipset, metal-wrapped card slots, and support for PCI Express SSDs over either U.2 or M.2.

PC DIY hounds building a gaming PC around AMD's Ryzen 7 CPUs will dig this board. It sports the X370 chipset for multi-video-card goodness, and it has slick lighting.

MSI's midrange Z270 board packs next-gen storage features, tasteful RGB lighting, and stealthy looks into a package under $200. We like it, but could do without the plastic flourishes that complicate installation.

Some layout nitpicks aside, the Aorus Z270X Gaming 5 is a fully featured and thoughtfully designed gaming motherboard that supports Intel's latest chipset and processors.

Loaded with LEDs and leading features like USB 3.1 and M.2 connectors, the X99-Ultra Gaming is a well-equipped, surprisingly low-priced X99 board. Just bring your own Wi-Fi (if you need it), and you're ready to do battle.

This scrappy X99 motherboard comes in at a lower price than many luxury boards, but still supports tri-SLI, USB 3.1, two M.2 connectors, and is loaded with plenty of gaming features.

This metal-bedecked mobo delivers the class and quality that a luxury gaming PC demands. With 4-way SLI, USB 3.1 in two flavors, overclocking frills galore, deep M.2 support, and vast amounts more, it's a fully loaded gaming beast.

EVGA's X99 flagship motherboard is a solid foundation for a high-end gaming PC, thanks to its overclocking features, support for 4-Way SLI, and modern extras like comprehensive M.2 support and USB 3.1 Type-C and Type-A.

Asus' first Strix-branded X99 board is a boon for gamers who crave software-controlled, color-coordinated lighting. The feature set is solid; just know that its bandwidth sharing and slot layout mean it's not the best board for jam-packed builds.

Gigabyte's Micro-ATX X99 board packs a lot of features in a small space and, with a few modest caveats, makes a good starting point for a compact, dual-card gaming system.

For those looking to drop as many high-end graphics cards as possible into a new X99-based PC build, Asus' X99-Deluxe is an excellent option. It has lots of forward-looking features, a bushel of accessories, and loads of SATA III and USB 3.0 ports.