Micron Technology, Inc.
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ASRock
ASRock W790 WS Intel motherboard
Workstation motherboard for 4th Gen Intel Xeon W-3400 and W-2400 CPUs with quad-channel DDR5 ECC up to 2 TB, four PCIe 5.0 x16 slots, four M.2 Gen5, U.2 Gen4, eight SATA3.
- CPU Socket TypeLGA 4677
- CPU TypeSupports 4th Gen Intel Xeon W-3400 and W-2400 Processors (LG
- ChipsetIntel W790
- Number of Memory Slots8x288pin (DDR5)
- Memory StandardSupports DDR5 ECC, buffered memory (RDIMM/ RDIMM-3DS/ RDIMM-
- Maximum Memory Supported2TB
- Supports 4th Gen Intel Xeon W-3400 and W-2400 processors via LGA 4677 socket
- 20+2 power phase with 90A SPS design for stable delivery
- 14 layer server-grade ultra low-loss PCB ensures signal integrity
- Four PCIe 5.0 x16 slots plus one PCIe 4.0 x16 slot for expansion
- Four Blazing M.2 sockets with PCIe Gen5 x4 plus one U.2 mini SAS connector
Socket LGA 4677 workstation board
The ASRock W790 WS is a CEB form-factor motherboard built for 4th Gen Intel Xeon W-3400 and W-2400 processors. It targets professional workstations that need high core counts, large memory capacity and extensive I/O for compute-intensive workloads.
Quad-channel DDR5 with four PCIe 5.0 x16 slots
Eight 288-pin slots accept DDR5 ECC RDIMMs up to 2 TB in quad-channel mode, with native speeds of 4800 MHz on W9, W7 and W5 CPUs. Four PCIe 5.0 x16 slots (two at x16, two at x8) plus one PCIe 4.0 x16 slot at x4 give room for multiple GPUs, accelerators or NVMe add-in cards. A U.2 connector and four M.2 sockets (all PCIe Gen5 x4) plus eight SATA3 ports provide dense storage expansion without using expansion slots.
20+2 phase 90A power on 14-layer PCB
The 20+2 power phase design with 90A SPS components and a 14-layer ultra low-loss PCB delivers stable current to high-wattage Xeon CPUs during sustained all-core loads. Dual Marvell AQC113CS 10 GbE ports and an Intel i225LM 2.5 GbE port maintain network throughput for long rendering or simulation jobs. Two USB4 Thunderbolt 4 Type-C ports and one USB 3.2 Gen2x2 Type-C header keep high-speed peripheral bandwidth available throughout extended sessions.
Highlights
- Supports 4th Gen Intel Xeon W-3400 and W-2400 processors via LGA 4677 socket
- 20+2 power phase with 90A SPS design for stable delivery
- 14 layer server-grade ultra low-loss PCB ensures signal integrity
- Four PCIe 5.0 x16 slots plus one PCIe 4.0 x16 slot for expansion
- Four Blazing M.2 sockets with PCIe Gen5 x4 plus one U.2 mini SAS connector
Specifications
| Brand | ASRock |
|---|---|
| Model | W790 WS |
| CPU Socket Type | LGA 4677 |
| CPU Type | Supports 4th Gen Intel Xeon W-3400 and W-2400 Processors (LGA4677) |
| Chipset | Intel W790 |
| Number of Memory Slots | 8x288pin (DDR5) |
| Memory Standard | Supports DDR5 ECC, buffered memory (RDIMM/ RDIMM-3DS/ RDIMM-9x4) up to 6800+(OC)* 1DPC Up to 6800+ MHz (OC), 4800 MHz Natively for Xeon W9, Xeon W7 and Xeon W5. 2DPC Up to 6000+ MHz (OC), 4400 MHz Natively for Xeon W9, Xeon W7 and Xeon W5. Supports 4400 MHz Natively for Xeon W3, W5-3423 and W5-3433. Overclocking is not supported. * Actual support may vary by CPU * Please refer to Memory Support List on ASRock's website for more information. (http://www.asrock.com/) |
| Maximum Memory Supported | 2TB |
| Channel Supported | Quad Channel |
| Memory Performance Profile | AMD EXPO |
| ECC Supported | Yes |
| PCI Express 5.0 x16 | 4 x PCIe 5.0 x16 Slots (PCIE1/PCIE3 at x16; PCIE2/PCIE5 at x8)* * Supports NVMe SSD as boot disks - 15µ Gold Contact in VGA PCIe Slots |
| PCI Express 4.0 x16 | 1 x PCIe 4.0 x16 Slot (PCIE4), supports x4 mode* * Supports NVMe SSD as boot disks |
| Other Slots | 1 x U.2 Connector, supports PCIe Gen4x4 (64 Gb/s) mode |
| Serial ATA (SATA) | 8 x SATA3 6.0 Gb/s Connectors |
| M.2 | 1 x Blazing M.2 Socket (M2_1, Key M), supports type 2230/2242/2260/2280 PCIe Gen5x4 (128 Gb/s) mode* 2 x Blazing M.2 Sockets (M2_2 and M2_3, Key M), support type 2260/2280 PCIe Gen5x4 (128 Gb/s) mode* 1 x Blazing M.2 Socket (M2_4, Key M), supports type 2260/2280 PCIe Gen5x4 (128 Gb/s) mode* * Supports Intel Volume Management Device (VMD) * Supports NVMe SSD as boot disks |
| SATA RAID | Supports RAID 0, RAID 1, RAID 5 and RAID 10 for SATA storage devices Supports RAID 0, RAID 1, RAID 5 and RAID 10 for M.2 NVMe storage devices* * Requires additional M.2 NVMe expansion cards to support RAID 10 |
| Audio Chipset | 7.1 CH HD Audio (Realtek ALC897 Audio Codec) Nahimic Audio |
| Audio Channels | 7.1 Channels |
| LAN Chipset | Marvell (Aquantia) AQC113CS - Support Wake-On-LAN - Support PXE |
| Second LAN Chipset | Intel I225LM - Support Wake-On-LAN - Support PXE - Supports Intel vPro Technology |
| Max LAN Speed | 2 x 10Gbps + 2.5Gbps |
| Wireless LAN | 802.11ax Wi-Fi 6E Module - Supports IEEE 802.11a/b/g/n/ac/ax - Supports Dual-Band 2x2 with extended 6GHz band* support * Wi-Fi 6E (6GHz band) will be supported by Microsoft Windows 11. The availability will depend on the different regulation status of each country and region. It will be activated (for supported countries) through Windows Update and software updates once available. * A 6GHz compatible router is required for 6E functionality. - 1 antenna to support 2 (Transmit) x 2 (Receive) diversity technology - Supports Bluetooth 5.3 + High speed class II - Supports MU-MIMO |
| Bluetooth | Yes |
| Back I/O Ports | 2 x Antenna Ports 1 x Optical SPDIF Out Port 2 x USB4 Thunderbolt 4 Type-C Ports* 2 x USB 3.2 Gen2 Type-A Ports (10 Gb/s) 4 x USB 3.2 Gen1 Ports 3 x RJ-45 LAN Ports 1 x BIOS Flashback Button 1 x Line Out Jack (Gold Audio Jack) 1 x Microphone Input Jack (Gold Audio Jack) * Supports USB PD 3.0 up to 9V@3A (27W) / 5V@3A (15W) charging |
| Onboard USB | 2 x USB 2.0 Headers (Support 3 USB 2.0 ports) 2 x USB 3.2 Gen1 Headers (Support 4 USB 3.2 Gen1 ports) 1 x Front Panel Type C USB 3.2 Gen2x2 Header (20 Gb/s) |
| Other Connectors | 1 x Virtual RAID On CPU Header 1 x SPI TPM Header 1 x Chassis Intrusion and Speaker Header 1 x CPU Fan Connector (4-pin)* 1 x CPU/Water Pump Fan Connector (4-pin) (Smart Fan Speed Control)** 3 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan Speed Control)*** 1 x Front Panel Audio Connector 1 x Clear CMOS Button 1 x Dr. Debug with LED 1 x Power Button with LED 1 x Reset Button with LED * CPU_FAN1 supports the fan power up to 1A (12W). ** CPU_FAN2/WP_3A supports the fan power up to 3A (36W). *** CHA_FAN1~3/WP support the fan power up to 2A (24W). *** CPU_FAN2/WP_3A and CHA_FAN1~ |
| BIOS Feature | 256Mb AMI UEFI Legal BIOS with GUI support |
| Windows 11 | Supported |
| Form Factor | Extended ATX |
| Dimensions (W x L) | 12.0" x 10.9" |
| Features | Superb Productivity - PCIe Gen5 (Graphics, M.2) - Quad Channel DDR5 - USB4 Thunderbolt 4 Type-C Ports Rock-Solid Durability - Ultra Low-Loss PCB - 20+2 Power Phase, 90A SPS with Enlarged Heatsink Armor - Flexible Integrated I/O Shield - Nichicon 12K Black Caps (100% Japan made high quality conductive polymer capacitors) Ultrafast Connectivity - Dual Marvell (Aquantia) 10GbE LAN - Intel 2.5GbE LAN - Intel vPro for Workstations with Intel Advanced Management Technology - 802.11ax Wi-Fi 6E Module EZ Update - BIOS Flashback Button - ASRock Auto Driver Installer |
| Package Contents | 1 x User Manual 4 x SATA Data Cables 1 x ASRock WiFi 2.4/5/6 GHz Antenna 1 x CPU Carrier for LGA 4677 E1A 1 x CPU Carrier for LGA 4677 E1B 4 x Screws for M.2 Sockets 2 x Standoffs for M.2 Sockets |
| Shipping weight | 2.18 kg |
| Package size | 375 × 315 × 92 mm |
Questions about this item
What limits 4th Gen Intel Xeon W-3400 and W-2400 CPU performance under sustained load?
The 20+2 power phase design with 90A SPS delivers stable current, while the 14-layer ultra-low-loss PCB manages heat during extended workloads.
How loud and hot does the ASRock W790 WS get during all-day operation?
Passive chipset and VRM cooling keeps noise near zero; the 14-layer PCB spreads heat efficiently under continuous multi-core loads.
Which CPU and memory must I already own for this LGA 4677 board to work?
Requires a 4th Gen Intel Xeon W-3400 or W-2400 processor and DDR5 ECC RDIMM modules; maximum capacity is 2 TB across eight slots.
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