This article covers ASRock Intel Z390 チップセット搭載 ATX マザーボード Z390 Taichi Ultimate.

Overview

ASRock's Z390 Taichi Ultimate is an ATX motherboard designed for Intel 8th and 9th generation Core processors using the LGA1151 socket. Equipped with the Intel Z390 chipset, it features a 12-phase digital power delivery system that handles heavy overclocking workloads with ease. The standout feature is the integrated AQUANTIA 10GBASE-T Ethernet, providing ten times the bandwidth of typical 1GbE for faster file transfers and NAS access. Beyond networking, the board includes dual Gigabit LAN (Intel I219V and I211-AT), 2T2R 802.11ac Wi-Fi, and a full complement of expansion options: three PCIe 3.0 x16 slots, four M.2 slots (one dedicated for the wireless module), and eight SATA3 ports. The Realtek ALC1220 codec with Purity Sound 4 technology delivers high-fidelity audio. Available on Japan for around ¥12,800, it offers exceptional value for a premium Z390 motherboard.

Compatibility Guide

The LGA1151 socket supports Intel Core 9th Gen (e.g., i9-9900K, i7-9700K) and 8th Gen CPUs. Memory uses DDR4 with speeds up to 4200MHz (OC) across four slots, supporting up to 64GB. The ATX form factor fits most mid-tower or larger cases. All PCIe slots are PCIe 3.0; the primary x16 slots are reinforced with steel shielding for heavy graphics cards. Storage interfaces include four M.2 slots (PCIe 3.0 x4 and SATA modes) and eight SATA 6Gb/s ports, enabling flexible RAID setups. Power connectors consist of a 24-pin main, an 8-pin CPU, and an additional 4-pin CPU for stable overclocking. A 650W or higher PSU is recommended for a typical high-end build.

Product Info

Released in late 2018, the ASRock Z390 Taichi Ultimate was the flagship model of ASRock's Z390 lineup. It is positioned as a high-end enthusiast board with a focus on networking, integrating the rare built-in 10GbE controller. Warranty is standard three years from ASRock. Given its age, availability is now mostly through second-hand or clearance channels.

Best Use Cases

Home server or NAS builder with network needs: The 10GbE port is ideal for users connecting to a 10Gb-capable switch and NAS for high-speed storage access. Not suited for those on standard 1Gb home networks—upgrade the whole infrastructure to benefit. Overclocking enthusiasts: The 12-phase VRM and quality components allow for aggressive CPU overclocking on 9th Gen chips like the i9-9900K. Beginners who prefer plug-and-play may find the BIOS tuning too complex. Budget-conscious builders seeking a feature-rich Z390 board: Given the low current price, it's an excellent choice for a secondary PC or a dedicated streaming/encoding rig—provided you already have compatible LGA1151 hardware. Not recommended for: Users wanting to use Intel 10th Gen or newer CPUs, or anyone who prefers a modern platform with PCIe 4.0/5.0 and native USB 3.2 Gen2x2.

Things to Consider

The biggest limitation is that the Z390 chipset does not support CPUs beyond Intel's 9th generation. If you're building a new system from scratch, modern alternatives (B660/B760 with LGA1700 or Ryzen 7000-series) will offer better per-core performance and platform longevity. While 10GbE is excellent, it requires compatible networking equipment (10GBASE-T switch, Cat6a cables) that can cost as much as the motherboard itself. If your network remains on Gigabit, the feature is wasted. The board is no longer in regular production; availability is limited to used or leftover stock. Be sure to check the BIOS version and capacitor health when buying second-hand. ## FAQ
Q: Can I use an LGA1200 (10th Gen or newer) Intel CPU? A: No. This motherboard only supports LGA1151 CPUs from 8th and 9th Gen Core series. For 10th Gen and later, you need a Z490/Z590 or LGA1700-based board. Q: Can I achieve 10 Gbps with a standard Cat5e cable? A: It may work over very short distances but is not reliable. ASRock recommends Cat6a or higher cabling for stable 10GBASE-T operation. Q: Is this board compatible with AMD Ryzen processors? A: Absolutely not. It is an Intel-only platform with an LGA1151 socket. For AMD CPUs, look at B450/X570 or newer AM5 boards.

Product Disclosure (Amazon)

  • Manufacturer: ASRock
  • ASIN: B07HYBV9TV
  • Note: This article covers a manufacturer-made product based on Amazon listing details.