ASRock X299 Taichi CLX Review: More Lanes, Better Features

ASRock’s X299 Taichi hits the bench with 2.5GbE and 48 CPU-based lanes.

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Tom's Hardware Verdict

A quality build and enhanced features make the X299 Taichi CLX a good option for those who want fast Ethernet and full lane support for Intel's new CPUs. Those features also add enough value to make it outshine ASRock’s earlier X299 Taichi.


  • +

    Supports all 48 lanes of Intel’s “10th-gen” CPUs

  • +

    Dual-networking includes one 2.5GbE

  • +

    Good overall performance

  • +

    Good overclocking options


  • -

    Slightly pricier than previous-gen Taichi

  • -

    All lanes shared between M.2 slots 1-2 and 2nd PCIe slot

  • -

    44-lane and 28-lane CPUs disable second M.2 slot

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We were a little surprised when we first learned that Intel would be using its X299 chipset for its “10th-gen” HEDT (High-End Desktop) processors. Even as its mainstream platform was updated from a rehash of the four-year-old Z170 to a modernized USB3 Gen2-supporting part, the HEDT platform appears stuck with the same badge-engineered variation of its previous tech that we’ve had from LGA 2066 inception back in mid-2017. Dealt by Intel pairs of duces and threes, ASRock is hoping for a full house with the X299 Taichi CLX.

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In addition to breaking out the new processors' extra four lanes, the X299 Taichi CLX adds 2.5GbE to its standard Gigabit Ethernet controller, picks up Intel’s AX200 Wi-Fi 6 controller, and pairs up two USB 3.2 interfaces via ASMedia’s ASM3241 controller to support an I/O-panel-integrated Type-C Gen2x2 riser card.


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ChipsetIntel X299 PCH
Form FactorATX
Voltage Regulator13 Phases
Video PortsX
USB Ports20Gb/s: (1) Type-C
USB Ports5Gb/s: (4) Type A; (2) USB 2.0
Network Jacks2.5GbE, Gigabit Ethernet, (2) Wi-Fi Antenna
Audio Jacks(5) Analog, (1) Digital Out
Legacy Ports/Jacks(1) PS/2
Other Ports/JackCLR_CMOS Button
PCIe x16(4) v3.0 (@48: x16/x8*/x16/x8); (CPU @44: x16/x4*/x16/x8); (CPU @28: x16/x4*/x8/x0); *M.2-1 and M.2-2 steal 4-lanes each
PCIe x8
PCIe x4X
PCIe x1(1) v3.0
CrossFire/SLI3x / 3x
DIMM slots(8) DDR4
M.2 slots(2) PCIe 3.0 x4*, (1) PCIe 3.0 x4 / SATA^ (Shared with *2nd PCIe Slot, ^8th SATA Port)

Much of the above-mentioned connectivity is hidden behind an integrated I/O shield, which conceals the AX200 and ASM3242 riser cards for which Wi-Fi and USB Type-C connectors are visible. Between these are the Gigabit and 10GbE networks ports, five analog audio jacks, digital (optical) audio output, four USB3 Gen1 ports, and two USB 2.0 ports. 

The ALC1220 controller includes a DTS Connect license for live streaming multi-channel audio through the digital output to compatible receivers, and the chipset’s lack of modernity is responsible for the USB 2.0 ports. Not that we mind: Keyboards and mice don’t benefit from higher-speed interfaces.

Oh, and let’s not forget the recessed CLR_CMOS button that helps overclockers recover from a bad config without tearing their system apart.

(Image credit: Tom's Hardware)

The use of an elder chipset helps to assure buyers that only a firmware update is needed for older systems to support new processors, but none of those older X299 boards can address the extra four available PCIe 3.0 lanes provided by Intel's brand-new silicon. Indeed, several of the “new” boards we’ve seen announced have the same issue, leading us to believe that those were simply minor revisions of previous products. Conversely, the X299 Taichi CLX has a properly freshened design that applies those four lanes to the second PCIe slot.

(Image credit: Tom's Hardware)

Rather than lay out its slots to support four double-slot graphics cards, ASRock treats that second x16-length slot as a storage option. The highest possible slot space is instead occupied by an M.2 slot and covered with an aluminum shroud, as is the blank-looking space between the first and second PCIe slot. And this gets back to treating the second PCIe slot as a storage option: Its eight lanes are shared with the aforementioned M.2 slots, so that installing an eight-lane PCIe M.2 adapter becomes a preferable option to removing the entire cover panel every time you’d like to access a drive.

(Image credit: Tom's Hardware)

Thus, the CPU’s lanes are configured as x16/x8/x16/x8 when a 48-lane CPU is used, but only x16/x4/x16/x8 when controlled by a 44-lane CPU. With only four lanes available to the second slot when using older processors, there are only four lanes for the M.2 slots to steal. Rather than force both M.2 slots to share four lanes whenever a 44-lane CPU is installed, the middle M.2 slot is simply disconnected.

The upper half of the X299 Taichi CLX has four DIMMs, three fan headers, two EPS12V connectors feeding a 13-phase voltage regulator, aRGB, standard RGB, and USB3 Gen2 front-panel headers, The bottom  of this board is more complex. We see a bunch of PCIe switches near the upper two slots that help the board negotiate traffic down to those lowly 28-lane CPUs (x16/x4/x8/x0, if anyone cares), a third M.2 interface that’s connected to the X299 PCH, ten SATA ports of which two share a single PCIe lane through a ASM1061 controller, and even an open-ended PCIe x1 slot that appears to have enough space to hold at least an x4 card and 2280 M.2 card simultaneously, which is great since that’s the only M.2 cover that can be removed separately.

(Image credit: Tom's Hardware)

Along the X299 Taichi CLX’s bottom edge are an HD-Audio front-panel header and one for a Thunderbolt add-in card, four more 4-pin fan headers, a VROC module connector for NVMe RAID, secondary RGB and aRGB headers, two dual-port USB 2.0 headers, a CLR_CMOS jumper, two-digit status code display, reset and power buttons, an Intel-standard front-panel button/LED group, and a PC Speaker/legacy power LED combo header.

(Image credit: Tom's Hardware)

Along with the board itself, the X299 Taichi CLX includes a software disc and print documentation, a legacy SLI bridge, four SATA cables, a Wi-Fi antenna, several M.2 screws and a case badge.

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Thomas Soderstrom
Thomas Soderstrom is a Senior Staff Editor at Tom's Hardware US. He tests and reviews cases, cooling, memory and motherboards.