ASUS Crosshair IV Formula ROG AM3 Motherboard

The Crosshair IV Formula was ASUS Republic of Gamers' flagship for the golden era of AMD Socket AM3, and it remains one of the most satisfying platforms from that generation to build on today. Built around the AMD 890FX chipset, it pairs support for Phenom II processors, including the six-core X6 models, with a multi-slot PCIe layout made for ATI CrossFireX gaming rigs of its day. SupremeFX 7.1-channel audio, ROG-grade power and cooling design and a full ATX layout made it the board enthusiasts chose when they wanted their AM3 build to be special, and it still turns a period-correct retro rig into something genuinely worth showing off.

Key Features

• Republic of Gamers ATX board for AMD Socket AM3
• AMD 890FX chipset platform
• Supports AMD Phenom II processors, including 6-core X6 models
• Four DDR3 DIMM slots, dual-channel, up to 16GB
• Multi-GPU ATI CrossFireX graphics support
• SupremeFX 7.1-channel high-definition audio
• HyperTransport up to 2600MHz

Product Specifications

• CPU Socket: AM3 for AMD Phenom II and Athlon II processors
• Chipset: AMD 890FX northbridge with SB850 southbridge
• Memory: 4x DDR3 DIMM slots, dual-channel, up to 16GB total
• HyperTransport: up to 2600MHz link speed
• Expansion: multiple PCIe 2.0 x16-class slots supporting ATI CrossFireX multi-GPU configurations
• Storage: Serial ATA ports with RAID support on the SB850 platform
• Audio: SupremeFX 7.1-channel HD audio
• Networking: onboard Gigabit Ethernet
• Form Factor: ATX

Use Cases

This is the board for a period-correct AM3 retro gaming build, a restoration of a Phenom II machine that deserves better than a failed board, or a budget performance project built from the strong secondhand AM3 CPU market. Collectors of the ROG line also prize it as one of the defining AMD boards of its generation, complete with the audio and layout refinements that made the Formula series famous.

Compatibility

The board runs AMD Socket AM3 processors, led by the Phenom II X6 six-core family, with DDR3 memory up to 16GB across four dual-channel slots. Graphics scaling comes through CrossFireX-ready PCIe 2.0 slots, and it pairs naturally with era-appropriate AMD Radeon cards and AM3-era operating system support from Windows through modern Linux retro builds.

Frequently Asked Questions

Which CPUs work in this board?

AMD Socket AM3 processors, including Phenom II X6 six-core, X4 quad-core and Athlon II families.

How much memory can I install?

Up to 16GB of DDR3 across the four dual-channel DIMM slots.

Can it run multiple graphics cards?

Yes, its PCIe 2.0 x16-class slot configuration supports ATI CrossFireX multi-GPU setups, which was a headline ROG feature of the platform.

Is it good for a retro gaming build?

It is one of the definitive AM3 enthusiast boards, combining six-core Phenom II support, CrossFireX and SupremeFX audio for authentic late-AM3-era builds.

Some boards are remembered because they were the best of their moment, and the Crosshair IV Formula is exactly that kind of hardware. With ROG power delivery, 890FX platform muscle, six-core AM3 support and CrossFireX graphics muscle under the hood, it turns a retro AMD build from a nostalgia exercise into a genuinely capable machine.