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Rectangular ATX motherboard with black PCB and silver heatsinks, LGA 2066 socket, eight DDR4 slots, multiple PCIe x16 slots

ASRock

ASRock X299 EXTREME4 LGA 2066 Intel motherboard

SKU CH-BBGF-HRKBW

ATX board for Core X series CPUs with quad-channel DDR4 up to 128 GB, three PCIe 3.0 x16 slots, dual Ultra M.2 sockets, eight SATA3 ports and Intel I219-V LAN

  • ProcessorCore X series (LGA2066)
  • ChipsetIntel X299
  • Form factorATX
  • CPU socketLGA 2066
  • CPU technologiesSupports Intel Turbo Boost Max Technology 3.0 * Please note
  • Memory slot count8 × 288pin (DDR4)
  • Supports Core X series CPUs via LGA 2066 socket
  • Quad-channel DDR4 memory up to 128 GB capacity
  • Three PCI Express 3.0 x16 slots for multi-GPU configurations
  • Two Ultra M.2 sockets with PCI Express 3.0 x4 bandwidth
  • Intel I219-V LAN plus Realtek ALC1220 7.1-channel audio

LGA 2066 workstation motherboard

The ASRock X299 EXTREME4 accepts Intel Core X series processors in an LGA 2066 socket and provides eight DDR4 slots for quad channel memory up to 128 GB. It targets content creators and engineers who need many cores and large memory capacity on an ATX form factor.

Memory and storage configuration

Four Ultra M.2 sockets support modules from 2230 to 2280 length, with the top two slots wired for PCI Express 3.0 x4 speeds up to 32 Gb/s. Eight SATA3 ports add RAID 0, 1, 5 and 10 options, though populating M.2 slots can disable adjacent SATA connectors.

PCI Express lane allocation

The CPU lane count determines how the three PCI Express 3.0 x16 slots divide bandwidth: 44 lane processors run x16/x16/x4, 28 lane processors run x16/x8/x4, and 16 lane processors reduce the arrangement further. Using the PCI Express x1 slot disables the M.2 Key E socket for Wi-Fi modules.

How it compares

Measured against everything we stock in Motherboards for Intel CPUs, at today’s prices. Recalculated every night.

Price $296.99
Pricier than about 90% of the 2,965 comparable items (median $97.99).

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Specifications

Product
Brand nameASRock
Model nameX299 EXTREME4
Processor
ProcessorCore X series (LGA2066)
CPU socketLGA 2066
ChipsetIntel X299
CPU technologiesSupports Intel Turbo Boost Max Technology 3.0
* Please note that the 4-Core processors only support Intel Turbo Boost Technology 2.0.
Memory
Memory slot count8 × 288pin (DDR4)
Memory channelsQuad Channel
Storage
M.2 slots1 x Ultra M.2 Socket (M2_1), supports M Key type 2230/2242/2260/2280 M.2 SATA3 6.0Gb/s module and M.2 PCI Express module up to Gen3 x4 (32Gb/s)**
1 x Ultra M.2 Socket (M2_2), supports M Key type 2230/2242/2260/2280/22110 M.2 SATA3 6.0Gb/s module and M.2 PCI Express module up to Gen3 x4 (32Gb/s)**
** Supports Intel Optane Technology
** Supports NVMe SSD as boot disks
** Supports ASRock U.2 Kit
SATA and RAID support0/1/5/10
Graphics
Onboard video chipNone
Audio & video
Audio chipRealtek ALC1220
Sound channels7.1 Channels
Connectivity
Ethernet controllerIntel I219-V
Maximum network speed1 Gbit/s
Ports & slots
PCIe x1 slots1 x PCI Express 3.0 x1 Slot**
** If PCIE1 slot is occupied, M2_3 slot will be disabled.
Additional slots1 x M.2 Socket (Key E), supports type 2230 Wi-Fi/BT module
15µ Gold Contact in VGA PCIe Slot (PCIE2 and PCIE3)
PS/2 ports1 x PS/2 Mouse Port
1 x PS/2 Keyboard Port
Ethernet port1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED LED)
USB 3.1 ports1 x USB 3.1 Gen2 Type-A Port (10Gb/s) (ASMedia ASM3142) (Supports ESD Protection)
4 x USB 3.1 Gen1 Ports (Supports ESD Protection)
USB 2.0 ports2 x USB 2.0 Ports (Supports ESD Protection)
USB-C ports1 x USB 3.1 Gen2 Type-C Port (10Gb/s) (ASMedia ASM3142) (Supports ESD Protection)
S/PDIF output1 x Optical
Audio jacksHD Audio Jacks: Rear Speaker / Central / Bass / Line in / Front Speaker / Microphone
Onboard USB headers2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD Protection)
1 x USB 3.1 Gen1 Header (Supports 2 USB 3.1 Gen1 ports) (Supports ESD Protection)
Power
Power connectors1 × 24-pin ATX Power Connector (Hi-Density Power Connector)
2 × 8-pin 12 V Power Connectors (Hi-Density Power Connector)
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
More details
LightingRGB

Questions about this item

Will the 15µ gold contacts in the PCIe x16 slots need periodic cleaning or replacement?

The 15µ gold contacts are a durable surface finish on the PCIe slots; they do not wear out in normal use and require no scheduled cleaning or replacement.

Which component limits sustained performance first — the 44-lane CPU PCIe topology or the quad-channel DDR4 memory bandwidth?

With a 44-lane Core X processor the three PCIe 3.0 x16 slots run at x16/x16/x4, so multi-GPU or high-speed add-in cards hit the lane budget before the quad-channel DDR4 interface saturates.

How much heat and fan noise should I expect from the X299 chipset and VRM area when the board runs all day with a 128GB DDR4 kit?

The Intel X299 PCH and the board's voltage regulators are passively cooled; with a 128GB quad-channel DDR4 load they run warm but silent, relying on case airflow rather than active fans.

More in Motherboards for Intel CPUs

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