ASRock X399 TAICHI sTR4 AMD ATX Motherboard

Name: ASRock X399 TAICHI sTR4 AMD ATX Motherboard
Brand: ASRock
SKU: X399 TAICHI

Overview

The ASRock X399 TAICHI is an ATX platform built for AMD's TR4 Threadripper socket — processors that bring up to 32 cores, 64 PCIe 3.0 lanes, and quad-channel DDR4 memory to a desktop workstation chassis. Those 64 PCIe lanes are the fundamental differentiator from mainstream platforms: they allow the TAICHI to simultaneously populate four PCIe 3.0 x16 slots, three Ultra M.2 slots, and eight SATA3 ports with meaningful bandwidth to spare. The 11-phase IR Digital PWM and Dr. MOS power stages are sized appropriately for Threadripper's thermal design envelope — up to 250W TDP for the 2990WX — making sustained all-core workloads and overclocking scenarios manageable without thermal throttling under the VRM.

The X399 TAICHI targets workstation builders: 3D rendering, video editing, scientific computing, and multi-GPU machine learning are its native applications. The dual Intel Gigabit LAN with bonding capability addresses high-throughput file transfer needs in studio or lab environments. The Realtek ALC1220 audio codec with DTS Connect is capable for a workstation but irrelevant to the core use case. Bluetooth 4.2 and Intel 802.11ac Wi-Fi keep wireless options open without consuming a PCIe slot. Memory configuration discipline matters significantly on this platform — Threadripper's quad-channel controller performs best with eight matched DIMMs in the recommended slots, and DDR4-3600+ OC speeds require validated memory kits. This is a deliberate, high-complexity build platform for users who know exactly what they're constructing and why they need the lane count to do it.

Key Features

Supports AMD TR4 Socket Ryzen Threadripper Series CPUs

IR Digital PWM, 11 Power Phase & Dr. MOS and operating system is microsoft windows 10 64-bit,windows 10 RS2 is supported

7.1 CH HD Audio (Realtek ALC1220 Audio Codec), Supports DTS Connect.Supports high speed wireless connections up to 433Mbps

8 SATA3, 3 Ultra M.2 (PCIe Gen3 x4 & SATA3)

2 USB 3.1 10Gb/s (1 Type-A + 1 Type-C), 12 USB 3.0 (4 Front, 8 Rear).Supports Bluetooth 4.2 / 3.0 + High speed class II

Specifications

CPU Socket

AMD TR4 (Ryzen Threadripper, 1st and 2nd Gen)

Power Design

11-phase IR Digital PWM, Dr. MOS

Memory Support

DDR4 up to 3600+(OC), 8x DIMM slots, Quad-Channel

PCIe Slots

4x PCIe 3.0 x16, 1x PCIe 2.0 x1

M.2 Slots

3x Ultra M.2 (PCIe Gen3 x4 & SATA3)

SATA Ports

8x SATA3

USB

2x USB 3.1 Gen2 (1x Type-A, 1x Type-C), 12x USB 3.0

LAN

Dual Intel Gigabit LAN

Wireless

Intel 802.11ac (up to 433 Mbps), Bluetooth 4.2

Audio

7.1 CH HD (Realtek ALC1220), DTS Connect

Multi-GPU

NVIDIA 4-Way SLI, AMD 4-Way CrossFireX

Form Factor

ATX

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Pros & Cons

👍 Pros

Four PCIe 3.0 x16 slots enable 4-Way SLI or CrossFireX GPU configurations — a capability unavailable on any consumer AM4 or mainstream Intel platform at any price
Three Ultra M.2 PCIe Gen3 x4 slots allow triple NVMe RAID or dedicated drive allocation for OS, scratch, and project storage without consuming SATA ports
Dual Intel Gigabit LAN provides redundant, bondable network connectivity for workstation builds where network throughput is part of the production pipeline
11-phase Dr. MOS power delivery supports stable all-core overclocking on high-TDP Threadripper CPUs that would stress lesser VRM designs
Onboard Intel 802.11ac Wi-Fi with Bluetooth 4.2 eliminates the need for a separate wireless card on builds where PCIe slots are committed to expansion cards

👎 Cons

PCIe lane sharing across four x16 slots means no configuration delivers true simultaneous x16/x16/x16/x16 bandwidth — demanding GPU-to-GPU bandwidth scenarios will encounter allocation limits
DDR4 memory configuration for Threadripper's quad-channel controller requires eight DIMM population for maximum bandwidth — four-DIMM configurations run in half-bandwidth mode
The ATX form factor and TR4 socket size require a large case — Mini-ITX or compact SFF builds are not an option with this platform
BIOS complexity on Threadripper platforms is significantly higher than mainstream consumer boards — memory training, NUMA/UMA mode selection, and lane bifurcation require careful configuration
As a first/second-gen Threadripper platform, it is end-of-life for CPU upgrade paths — there is no upgrade route to Threadripper Pro or third-generation without a full platform change

Frequently Asked Questions

Which AMD Threadripper CPUs are compatible with the X399 TAICHI, and does it support all TR4 processors?

The X399 TAICHI supports AMD TR4 socket Ryzen Threadripper Series CPUs — first-generation Threadripper (1900X through 1950X) and second-generation (2920X through 2990WX). It does not support third-generation Threadripper (TRX40 socket) or later, as those use different socket and platform architectures. Verify your CPU's TR4 compatibility before purchasing.

How does the 11-phase Dr. MOS power delivery affect overclocking stability on the X399 TAICHI?

The 11-phase IR Digital PWM with Dr. MOS integrated power stages means each phase delivers cleaner, more efficient power with lower switching losses than traditional discrete MOSFETs. For Threadripper overclocking — which involves pushing high core counts with significant TDP headroom — this translates to more consistent Vcore delivery and better sustained boost behavior under all-core loads.

Can all four PCIe 3.0 x16 slots run simultaneously at full x16 bandwidth?

No — Threadripper's 64 PCIe lanes are shared across all expansion slots, M.2 slots, and chipset-connected I/O. In a 4-GPU configuration, lanes are divided per AMD's allocation scheme (typically x16/x8/x8/x8 or similar depending on population). For GPU compute or rendering workloads, this is still significantly more bandwidth than single-socket AM4 platforms provide.

Does the onboard Intel 802.11ac Wi-Fi use an M.2 key slot, and does adding a Wi-Fi card consume a PCIe lane?

The onboard Intel 802.11ac Wi-Fi module is integrated and does not occupy one of the three Ultra M.2 storage slots. Its 433 Mbps maximum throughput is single-band limited — for sustained wireless data transfer in a workstation context, a wired Gigabit connection via the dual Intel LAN ports is the recommended path.

Are the three Ultra M.2 slots all PCIe Gen3 x4, or do some share bandwidth with SATA?

All three Ultra M.2 slots support PCIe Gen3 x4 (up to ~3.5 GB/s each) as well as SATA3. When populated with PCIe NVMe drives, they run at full Gen3 x4 bandwidth. Note that populating certain M.2 slots may disable specific SATA3 ports — consult the manual's bandwidth sharing map before finalizing storage configuration.