Is this board ATX or CEB?

Pro/SE is ATX. The Sage version is CEB. If you're considering buying this and don't use it on a server then disable the baseboard management controller in the BIOS. This will quicken your boot times.

Anybody else have this problem? This board seems to have an incredibly long boot time. It will sit on the splash screen for seemingly time without end. I have the ASUS STRIX X99 board which doesn't do this, which is the older chipset. Any suggestions?

Yes, I have three of these and they all boot up EXTREMELY slow. Like 20 minutes+. Running Windows 10 Pro 64. It seemed to happen until after some Windows update. It did not happen immediately after system build, and it did not happen all the time and now it is 100% every boot up. Fast boot is enabled. Updated to bios 0602 from 0502 and still the same thing. 20 minutes at the Asus splash screen logo. Computer runs great once booted up. Have not had time or energy to call Asus yet. You get an automatic update from Windows while working late and you are SCREWED. Other than this it seems awesome.

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ASUS WS X299 Pro/SE LGA 2066 Intel X299 USB 3.1 CEB Intel Motherboard

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Option: WS X299 PRO/SE

Prime X299-A
Prime X299-A II
Prime X299-Deluxe
Prime X299-Deluxe II
Prime X299 Edition 30
ROG RAMPAGE VI EXTRME OMEGA
ROG Strix X299-E Gaming
ROG Strix X299-E Gaming II
TUF X299 Mark 1
TUF X299 Mark 2
WS X299 PRO
WS X299 PRO/SE
WS X299 SAGE

Intel X299
Core X series (LGA2066)
Intel Core X-series Processors (6-core above):
DDR4 4133(O.C.)/ 4000(O.C.)/ 3600(O.C.)/ 2666/ 2400
Intel Core X-series Processors (4-core):
DDR4 4133(O.C.)/ 4000(O.C.)/ 3600(O.C.)/ 2666/ 2400

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Overview

Specs

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Model
Brand	ASUS
Model	WS X299 Pro/SE

Supported CPU
CPU Socket Type	LGA 2066
CPU Type	Core X series (LGA2066)

Chipsets
Chipset	Intel X299

Memory
Number of Memory Slots	Intel Core X-series Processors (6-core above): 8 x DIMM Intel Core X-series Processors (4-core): 4 x DIMM
Memory Standard	Intel Core X-series Processors (6-core above): DDR4 4133(O.C.)/ 4000(O.C.)/ 3600(O.C.)/ 2666/ 2400 Intel Core X-series Processors (4-core): DDR4 4133(O.C.)/ 4000(O.C.)/ 3600(O.C.)/ 2666/ 2400 * Hyper DIMM support is subject to the physical characteristics of individual CPUs. * Please refer to ASUS AVL for the latest update. * Actual memory frequency differs from Intel CPU types and memory module. Please check Intel official site for more detail about the memory types supported by each CPU.
Maximum Memory Supported	Intel Core X-series Processors (6-core above): 8 x DIMM, Max. 128GB Intel Core X-series Processors (4-core): 4 x DIMM, Max. 64GB

Expansion Slots
PCI Express 3.0 x16	44-Lane CPU: 2 x PCIe 3.0 x16 (x16 mode) 1 x PCIe 3.0 x16 (x8 mode) 1 x PCIe 3.0 x16 (x4 mode) 28-Lane CPU: 1 x PCIe 3.0 x16 (x16 mode) 1 x PCIe 3.0 x16 (x8 mode) 1 x PCIe 3.0 x16 (x4 mode) 16-Lane CPU: 1 x PCIe 3.0 x16 (x8 mode) 2 x PCIe 3.0 x16 (x4 mode)
PCI Express x4	44-Lane CPU: 1 x PCIe 3.0 x4 (x4 mode) 28-Lane CPU: 1 x PCIe 3.0 x4 (x4 mode) 16-Lane CPU: 1 x PCIe 3.0 x4 (x4 mode)

Storage Devices
Serial ATA (SATA)	6 x SATA 6Gb/s
M.2	1 x M.2 Socket 3, with M key, type 2242/2260/2280/22110 storage devices support (PCIE 3.0 x4 mode)1 1 x M.2 Socket 3, with M key, type 2242/2260/2280 storage devices support (both SATA & PCIE mode)2 1 x U.2 connector 1 Bandwidth is shared between M.2_2 and U.2 2 SATA Bandwidth is shared between M.2_1 and SAT6G_1
SATA RAID	0/1/5/10

Onboard Audio
Audio Chipset	Realtek ALC S1220A
Audio Channels	7.1 Channels

Onboard LAN
LAN Chipset	Intel I210-AT
Max LAN Speed	2 x 1Gbps

Rear Panel Ports
RJ45	2 x RJ45
USB 3.1	1 x USB 3.1 Gen 2 (Type-A) 4 x USB 3.1 Gen 1
USB 1.1/2.0	4 x USB 2.0
USB Type-C	1 x USB 3.1
S/PDIF Out	1 x Optical
Audio Ports	1 x 8-channel Audio I/O

Internal I/O Connectors
Onboard USB	1 x USB 3.1 Gen 1 connector(s) support(s) additional 2 USB 3.1 Gen 1 port(s) 1 x USB 2.0 connector(s) support(s) additional 2 USB 2.0 port(s)
Other Connectors	1 x Aura Addressable Strip Header(s) 1 x Aura RGB Strip Header 1 x COM port(s) connector(s) 1 x VROC_HW_Key 1 x Thunderbolt header(s) 1 x EZ XMP switch 1 x VGA connector(s) 1 x AUX panel header(s) 1 x 5-pin EXT_FAN (Extension Fan) connector 1 x Power-on button(s) 1 x Reset button(s) 1 x Clear CMOS button(s) 1 x Front fan 1 x Rear fan 1 x U.2 Connector (support U.2 NVMe device) 1 x AIO PUMP Header 1 x Thermal sensor connector 1 x CPU_OV jumper 1 x MemOK! Button 1 x PANEL2 1 x PUMP Fan connector 1 x PANEL1

Physical Spec
Form Factor	CEB
LED Lighting	RGB
Dimensions (W x L)	12.0" x 10.5"
Power Pin	1 x 24-pin EATX Power connector(s) 1 x 6-pin ATX Power connector 2 x 8-pin ATX 12V Power connector(s)

Features
Features	ASUS Control Center: A software utility that provides convenient, secure and cost-saving centralized IT management for small and medium businesses. ASMB9-iKVM (BMC): supports remote BIOS updates, fans control, standalone KVM, video recording, and BSOD capture, providing around-the-clock remote monitoring and diagnostics through remote console (Web GUI & CLI) Ultra-efficient VRM heatsink: Metal fin array connected to large surface area via a heatpipe tames X299 thermals to enable unthrottled performance. Next-gen transfer speeds: Up to 32Gbps dual M.2 and U.2, plus up to 10Gbps USB 3.1 Type-A and Type-C connections. Multi-GPU Support: Supports NVIDIA 3-Way SLI Technology * Supports AMD 3-Way CrossFireX Technology * *Actual number of Multi-graphic supported differs per Vendors' Graphic cards. Please check with Vendor beforehand. Special Features: OC Design - ASUS PRO Clock II Technology ASUS 5X Protection: - ASUS Enhanced DRAM Overcurrent Protection - Short circuit damage prevention - ASUS ESD Guards - Enhanced ESD protection - ASUS Stainless Steel Back I/O - 3x more durable corrosion-resistant coating ASUS EPU: - EPU ASUS Digital Power Design: - Industry leading Digital 8 Phase CPU Power Design - Industry leading Digital 2 Phase DRAM Power Design AURA: - Aura RGB Strip Headers - Aura Addressable Strip Header(s) ASUS Exclusive Features: - Ai Charger+ - Turbo LAN - Crystal Sound 3 ASUS Quiet Thermal Solution: - Stylish Fanless Design with M.2 Heat-sink solution ASUS Q-Design: - ASUS Q-Shield - ASUS Q-Code - ASUS Q-LED (CPU, DRAM, VGA, Boot Device LED) - ASUS Q-Slot - ASUS Q-DIMM - ASUS Q-Connector M.2 and U.2 Onboard (The Latest Transfer Technology with up to 32Gb/s Data-transfer Speeds for M.2 and U.2) Asus Control Center (ACC) IT management software supported

Packaging
Package Contents	Accessories: User's manual 1 x Vertical M.2 bracket set I/O Shield 1 x COM port cable(s) 6 x SATA 6Gb/s cable(s) 2 x M.2 screws 1 x Supporting DVD 1 x 3-Way SLI bridge(s) 1 x SLI bridge(s) 1 x Q-Connector 1 x 2-port USB module(s) 1 x Extension Cable for RGB strips (80cm)

Additional Information
First Listed on Newegg	July 16, 2026

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