ASUS PRIME B650M-K-CSM + Ryzen 9 9950X3D AMD motherboard CPU combo
- AM5
ASUS
ATX AM5 board paired with a 16-core Zen 5 CPU, DDR5 to 6400, PCIe 5.0 M.2, 2.5Gb LAN, USB4 support and BIOS FlashBack
model PRIME B650-PLUS
+CPU +Ryzen 9 9950X3D
This motherboard and CPU combination pairs the ASUS PRIME B650-PLUS with an AMD Ryzen 9 9950X3D processor. The AM5 socket supports Ryzen 9000, 8000 and 7000 series desktop CPUs. Four DDR5 slots accept up to 256 GB of memory. The board delivers PCIe 5.0 on the primary M.2 slot and 2.5 Gb Ethernet for fast networking.
The Ryzen 9 9950X3D runs at a 170 W TDP with 128 MB of L3 cache and 16 MB of L2 cache. The motherboard provides a VRM heatsink, an M.2 heatsink and a PCH heatsink linked to hybrid fan headers controlled by Fan Xpert 2+. This cooling arrangement is designed to maintain performance during extended workloads rather than brief bursts.
The ATX board uses 288-pin DDR5 slots with OptiMem II trace routing for signal integrity. Rear I/O includes HDMI, DisplayPort, USB 3.2 Gen 2 Type-C, USB 3.2 Gen 1 Type-C and USB4 support. Four SATA 6 Gb/s ports and two PCIe 4.0 x1 slots add expansion room. BIOS FlashBack updates firmware without a CPU or memory installed. Aura Sync headers address RGB lighting.
| Brand | ASUS |
|---|---|
| Series | Prime |
| Model | PRIME B650-PLUS+R9 9950X3D |
| CPU Socket Type | AM5 |
| CPU Type | Supports AMD Ryzen 7000 Series Desktop Processors* * Refer to www.asus.com for CPU support list. |
| Chipset | AMD B650 |
| Number of Memory Slots | 4x288pin (DDR5) |
| Memory Standard | DDR5 6400+(OC) / 6200(OC) / 6000(OC) / 5800(OC) / 5600(OC) / 5400(OC) / 5200 / 5000 / 4800* * Supported memory types, data rate(Speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information refer to www.asus.com for memory support list. * Non-ECC, Un-buffered DDR5 Memory supports On-Die ECC function. |
| Maximum Memory Supported | 256GB |
| Channel Supported | Dual Channel |
| ECC Supported | Yes |
| Buffer Supported | Un-buffered |
| Memory Feature | Supports AMD EXTended Profiles for Overclocking (EXPO) OptiMem II |
| PCI Express 4.0 x16 | AMD Ryzen 7000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x16 mode) AMD B650 Chipset 1 x PCIe 4.0 x16 slot (supports x4 mode) * Please check the PCIe bifurcation table on the ASUS support site |
| PCI Express x1 | 2 x PCIe 4.0 x1 slots |
| Serial ATA (SATA) | 4 x SATA 6Gb/s |
| M.2 | AMD Ryzen 7000 Series Desktop Processors M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 5.0 x4 mode) M.2_2 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 4.0 x4 mode) |
| SATA RAID | AMD RAIDXpert2 Technology supports both PCIe RAID 0/1/10 and SATA RAID 0/1/10 |
| Audio Channels | Realtek 7.1 Surround Sound High Definition Audio CODEC - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - Supports up to 24-Bit/192 kHz playback Audio Features - Audio Shielding - Premium audio capacitors - Dedicated audio PCB layers |
| Max LAN Speed | 2.5Gbps |
| Wireless LAN | Vertical M.2 slot only (Key E, PCIe)* * Wi-Fi module is sold separately. |
| Back I/O Ports | 4 x USB 3.2 Gen 2 ports (3 x Type-A + 1 x USB Type-C) 2 x USB 3.2 Gen 1 ports (2 x Type-A) 2 x USB 2.0 ports (2 x Type-A) 1 x DisplayPort 1 x HDMI port 1 x Vertical M.2 slot (Key E) 1 x Realtek 2.5Gb Ethernet port 5 x Audio jacks 1 x Optical S/PDIF out port 1 x BIOS FlashBack button |
| Onboard USB | 1 x USB 3.2 Gen 1 connector (supports USB Type-C ) 1 x USB 3.2 Gen 1 header supports 2 additional USB 3.2 Gen 1 ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports |
| Other Connectors | Fan and Cooling related 1 x 4-pin CPU Fan header 1 x 4-pin CPU OPT Fan header 1 x 4-pin AIO Pump header 3 x 4-pin Chassis Fan headers Storage related 2 x M.2 slots (Key M) 4 x SATA 6Gb/s ports Miscellaneous 3 x Addressable Gen 2 headers 1 x Aura RGB header 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (AAFP) 1 x SPI TPM header (14-1pin) 1 x 20-3 pin System Panel header with Chassis intrude function 1 x Thunderbolt (USB4) header |
| Form Factor | ATX |
| Dimensions (W x L) | 12.0" x 9.6" |
| Power Pin | 1 x 24-pin Main Power connector 1 x 8-pin +12V Power connector |
| Windows 11 | Supported |
| Features | ASUS 5X PROTECTION III - DIGI+ VRM - LANGuard - Overvoltage Protection - Safeslot Core+ - Stainless-Steel Back I/O ASUS Q-Design - Q-DIMM - Q-LED Core - Q-Slot ASUS Thermal Solution - Flexible M.2 heatsink - VRM heatsink design ASUS EZ DIY - BIOS FlashBack button - BIOS FlashBack LED - ProCool Aura Sync - Aura RGB header - Addressable Gen 2 headers |
| Package Contents | 1 x AMD Ryzen 9 9950X3D CPU 1 x Shin-Etsu X-23-7868-2D (1.8g) Cables 2 x SATA 6Gb/s cables Miscellaneous 1 x I/O Shield 1 x M.2 Rubber Package 1 x Screw package for M.2 SSD Documentation 1 x User guide |
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The CPU has a 170W TDP. The board includes a VRM heatsink, M.2 heatsink, PCH heatsink, hybrid fan headers and Fan Xpert 2+ to manage thermals.
The board accepts DDR5 modules at speeds from 4800 up to 6400+(OC) with AMD EXPO support. Maximum capacity is 256GB across four slots in dual-channel mode.
The board provides four SATA 6Gbps ports, one PCIe 4.0 x16 slot at x16 mode, one PCIe 4.0 x16 slot at x4 mode and two PCIe 4.0 x1 slots for legacy add-in cards.
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