ASUS PRIME B650-PLUS + Ryzen 9 9900X AMD motherboard CPU combo
- AM5
- Supports AMD Ryzen…
ASUS
Combines a B650 motherboard with a Ryzen 7 9800X3D CPU, supporting DDR5 memory up to 6400, PCIe 5.0 M.2, 2.5Gb LAN, USB4 and comprehensive cooling
model PRIME B650-PLUS
+CPU +Ryzen 7 9800X3D
The ASUS Prime B650-PLUS motherboard is paired with an AMD Ryzen 7 9800X3D processor in a single package. The AM5 socket board supports Ryzen 7000, 8000 and 9000 series desktop CPUs. This combination targets builders who want a ready-to-run platform for gaming and multitasking workloads. A BIOS update may be required before installing 8000 or 9000 series processors.
The primary M.2 slot operates at PCIe 5.0 x4 while the second runs at PCIe 4.0 x4, so the fastest drives only reach peak throughput in the top slot. The 2.5 Gb LAN port caps wired network transfers at that rate regardless of router capability. Four SATA 6 Gbps ports and two PCIe 4.0 x1 slots provide additional expansion within the chipset lane budget.
A VRM heatsink, dedicated M.2 heatsink and PCH heatsink work with hybrid fan headers and Fan Xpert 2+ for thermal management. Rear I/O includes USB 3.2 Gen 2 Type-C, DisplayPort, HDMI and a BIOS FlashBack button that updates firmware without a CPU or memory installed. Onboard addressable Gen 2 and standard RGB headers enable Aura Sync lighting control. USB4 support adds high-speed peripheral connectivity through compatible headers.
| Brand | ASUS |
|---|---|
| Series | Prime |
| Model | PRIME B650-PLUS+R7 9800X3D |
| 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 7 9800X3D 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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This listing is a fixed bundle that already pairs the PRIME B650-PLUS board with the Ryzen 7 9800X3D, so there is no separate board-only option to choose.
The extra cache on the 9800X3D sits directly on the CPU die and cuts latency for gaming workloads, letting the AM5 socket and B650 chipset feed data faster without extra memory tweaks.
The primary M.2 slot is wired for PCIe 5.0 x4 from the Ryzen 7000 series processor, so a compatible drive can hit the full 5.0 x4 bandwidth when the CPU is installed.
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