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6-Channel Non-ECC Unbuffered DDR4, 12 UDIMMs according to gigabyte

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GIGABYTE C621 AORUS XTREME LGA 3647 Intel C621 Extended ATX Intel Motherboard

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Intel C621
Support for Intel Xeon W-3175X Scalable processor in the LGA3647 package
DDR4 4200(O.C.)/ 4000(O.C.)/ 3800(O.C.)/ 3733(O.C.)/ 3600(O.C.)/ 3466(O.C.)/ 3400(O.C.)/ 3200(O.C.)/ 3000(O.C.)/ 2933(O.C.)/ 2800(O.C.)/ 2666/ 2400/ 2133
Supports W-3175X Processor at All Cores 5GHz+ (Overclocking)
6-Channel Non-ECC Unbuffered DDR4, 12 UDIMMs
32-Phases 1600A IR All Digital VRM Solution with PowIRstage
7-slots Multi-Way Graphics Support with PCIe Armor and Ultra Durable Design
Dual Intel i210AT + i219LM GbE with high ESD Protection
Ultra-Fast U.2 with PCIe Gen3 x4 interface
Supports 2 SATA Disk on Modules for Storage Expansion
Immersive Gaming ViBes with ALC1220-VB and WIMA audio capacitors
Lightning-Fast Intel Thunderbolt 3 AIC Support

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

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Model
Brand	GIGABYTE
Model	C621 AORUS XTREME

Supported CPU
CPU Socket Type	LGA 3647
CPU Type	Support for Intel Xeon W-3175X Scalable processor in the LGA3647 package

Chipsets
Chipset	Intel C621

Memory
Number of Memory Slots	12x288pin (DDR4)
Memory Standard	DDR4 4200(O.C.)/ 4000(O.C.)/ 3800(O.C.)/ 3733(O.C.)/ 3600(O.C.)/ 3466(O.C.)/ 3400(O.C.)/ 3200(O.C.)/ 3000(O.C.)/ 2933(O.C.)/ 2800(O.C.)/ 2666/ 2400/ 2133
Maximum Memory Supported	192GB
Channel Supported	6 channel

Expansion Slots
PCI Express 3.0 x16	2 x PCI Express x16 slots, running at x16 (PCIEX16_1/2) * For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16_1 slot. 4 x PCI Express x16 slots, running at x8 (PCIEX8_1/2/3/4) * The PCIEX8_1 slot shares bandwidth with the PCIEX16_1 slot and the PCIEX8_3 with PCIEX16_2. When PCIEX8_1/PCIEX8_3 is populated, PCIEX16_1/PCIEX16_2 operates at up to x8 mode. 1 x PCI Express x16 slot, running at x4 (PCIEX4) (All of the PCI Express slots conform to PCI Express 3.0 standard.)

Storage Devices
Serial ATA (SATA)	8 x SATA 6Gb/s
M.2	1 x U.2
SATA RAID	0/1/5/10

Onboard Audio
Audio Chipset	Realtek ALC1220-VB codec * The back panel line out jack supports DSD audio.
Audio Channels	2/4/5.1/7.1-channel Support for S/PDIF Out

Onboard LAN
LAN Chipset	2 x Intel GbE LAN chips
Max LAN Speed	2 x 1Gbps

Rear Panel Ports
Back I/O Ports	1 x PS/2 keyboard/mouse port 4 x USB 2.0/1.1 ports 2 x USB 3.1 Gen 1 ports 2 x RJ-45 ports 1 x optical S/PDIF Out connector 5 x audio jacks

Internal I/O Connectors
Onboard USB	1 x USB 3.1 Gen 1 header 1 x USB 3.1 Gen 1 port 1 x USB 2.0/1.1 header
Other Connectors	2 x OC_PEG power connectors 1 x CPU fan header 1 x water cooling CPU fan header 4 x system fan headers 2 x system fan/water cooling pump headers 2 x addressable LED strip headers 2 x addressable LED strip power select jumpers 2 x RGB LED strip headers 2 x SATA power headers 2 x SATA detection headers 1 x power information detection header 1 x front panel header 1 x front panel audio header 1 x S/PDIF Out header 1 x Trusted Platform Module (TPM) header (2x6-pin, for the GC-TPM2.0_S module only) 1 x Intel VROC Upgrade Key header 1 x serial port header 1 x Clear CMOS jumper 1 x reset button 1 x power button 2 x temperature sensor headers 1 x BIOS switch 1 x buzzer

Physical Spec
Form Factor	Extended ATX
LED Lighting	RGB
Dimensions (W x L)	15.2" x 14.1"
Power Pin	2 x 24-pin ATX main power connectors 4 x 8-pin ATX 12V power connectors

Features
Features	Multi-Graphics Technology: Support for NVIDIA Quad-GPU SLI and 4-Way/3-Way/2-Way NVIDIA SLI technologies Support for AMD Quad-GPU CrossFire and 4-Way/3-Way/2-Way AMD CrossFire technologies I/O Controller: iTE I/O Controller Chip H/W Monitoring: Voltage detection Temperature detection Fan speed detection Water cooling flow rate detection Overheating warning Fan fail warning Fan speed control * Whether the fan (pump) speed control function is supported will depend on the fan (pump) you install. BIOS: 2 x 256 Mbit flash Use of licensed AMI UEFI BIOS Support for DualBIOS PnP 1.0a, DMI 2.7, WfM 2.0, SM BIOS 2.7, ACPI 5.0 Unique Features: Support for @BIOS Support for Q-Flash Support for RGB Fusion Support for System Information Viewer Bundled Software: Norton Internet Security (OEM version) Operating System: Support for Windows 10 64-bit

Additional Information
First Listed on Newegg	November 07, 2025

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Item#: 9SIC3DRKN63990

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