This article covers ASRock AMD Threadripper対応X399チップセット搭載 ハイエンドATXマザーボード X399 Taichi.

Overview

The ASRock X399 Taichi is a high-end ATX motherboard built for AMD's Ryzen Threadripper processors, featuring the Socket TR4 and the X399 chipset. It supports up to 128GB of DDR4 memory across eight DIMM slots, and provides four PCIe 3.0 x16 slots for extensive multi-GPU configurations. Storage connectivity is a standout: eight SATA3 ports, three Ultra M.2 slots (PCIe Gen3 x4 & SATA3), and one U.2 port allow you to attach multiple high-speed NVMe SSDs and large-capacity drives. The board also includes dual Intel Gigabit LAN, 802.11ac Wi-Fi, and Bluetooth 4.2 for networking. Positioned as a premium workstation motherboard, the X399 Taichi balances expansion with reliability. The Taichi series is known for solid VRM designs and a feature set that appeals to creators, power users, and enthusiasts who need more PCIe lanes than mainstream platforms can offer.

Compatibility Guide

This motherboard uses Socket TR4 (also known as sTR4) and officially supports all AMD Ryzen Threadripper 1000 and 2000 series CPUs (Whitehaven and Colfax architectures). Memory support covers DDR4-3600+ (OC) with up to 128GB total, including ECC and non-ECC unbuffered modules. Form factor is standard ATX, fitting most ATX cases. The CPU cooler must be TR4-specific — standard AM4 coolers are not compatible. The power supply should have a 24-pin main connector plus two 8-pin EPS12V CPU power connectors; a quality 850W unit is recommended for a full Threadripper build with a GPU. Expansion: four PCIe 3.0 x16 slots (configurable as x16/x0/x16/x0 or x16/x8/x16/x8 in multi-GPU setups), one PCIe 2.0 x1 slot. Storage: 8x SATA3 6Gb/s, 3x M.2 (PCIe 3.0 x4 and SATA3), 1x U.2. USB: USB 3.1 Gen2 Type-A and Type-C on back panel, 12 USB 3.0 (4 front, 8 rear), 4 USB 2.0 (front).

Product Info

The ASRock X399 Taichi was originally released in late 2017 and remains available through some retailers and second-hand channels. As of June 2026, pricing on Japan sits around ¥324,990 (subject to market variation). The warranty is 2 years from the manufacturer. Market positioning: high-end tier. With a 11-phase VRM, BIOS Flashback, Dr. Debug, and extensive overclocking options, it targets users who need maximum PCIe lanes for GPU compute, NVMe storage arrays, or virtualization servers.

Best Use Cases

  • Workstation builders needing many PCIe lanes If you run 3D rendering, video production, or machine learning workloads that benefit from multiple GPUs and fast storage, the X399 Taichi is an excellent foundation. Four x16 slots let you run two or three GPUs at full bandwidth while leaving room for NVMe drives. - Storage enthusiasts building a home NAS or server Eight SATA ports plus three M.2 and one U.2 provide ample room for RAID arrays or caching. The dual Gigabit LAN can be used for link aggregation. - Threadripper overclockers The board includes CPU Xtreme OC switches, a dedicated water pump header, and robust VRM cooling. Enthusiasts who want to push their Threadripper CPU to the limit will appreciate these features. - Who should NOT buy this Gamers building a single-GPU system for gaming — a B550 or X570 board paired with a mainstream Ryzen CPU offers better value and modern features like PCIe 4.0. Also not suitable if you need PCIe 4.0/5.0 or a compact case. ## Alternatives
  • GIGABYTE X399 AORUS Gaming 7: Similar price and feature set, but with a stronger focus on RGB lighting and audio (ESS Sabre DAC). The AORUS has slightly different PCIe slot arrangement and fewer M.2 slots (2 vs 3). - MSI X399 Gaming Pro Carbon AC: Offers built-in Wi-Fi and Bluetooth, plus a more modern aesthetic. The MSI board tends to have better out-of-box RAM compatibility, but the ASRock Taichi often edges it out on storage expansion. All three are solid choices; the Taichi wins for pure expansion and enthusiast overclocking options.

Things to Consider

This motherboard is now a legacy product — it does not support PCIe 4.0 or 5.0, so newer high-bandwidth devices (like RTX 40-series GPUs or Gen4 SSDs) will be bottlenecked. If you need peak storage speed, consider a TRX40 or sWRX8 platform instead. Compatibility is limited to Threadripper 1000/2000 only — you cannot upgrade to later Threadripper generations (3000/5000 series) on this socket. Plan your CPU upgrade path accordingly. Second-hand purchases require attention to BIOS version. If you want to use a Threadripper 2000 chip (e.g., 2950X), the BIOS must be updated to at least version 2.00. The board has BIOS Flashback, but the process can be tricky. Finally, the price on is high compared to original MSRP. Unless you specifically need the storage expansion or have an old Threadripper CPU already, a modern platform may offer better value. ## FAQ Q: Does this board support Ryzen Threadripper 3990X? A: No, the 3990X uses Socket sWRX8 (TRX40) and is not compatible with X399. Only Threadripper 1000 and 2000 series work. **Q: Are

Product Disclosure (Amazon)

  • Manufacturer: ASRock
  • ASIN: B074J5R36W
  • Note: This article covers a manufacturer-made product based on Amazon listing details.