AMD Ryzen 9 PRO 9945 socket: AM5
The AMD Ryzen 9 PRO 9945 uses the AM5 socket. It is a 12-core Zen 5 desktop processor at 65 W for efficient multithreaded business work, running on 800 series boards out of the box and on 600 series boards after a BIOS update.
- Socket
- AM5
- Launched
- September 16, 2025
- Cores and threads
- 12 and 24
- Default TDP
- 65 W
- Codename
- Granite Ridge
- Segment
- Desktop
- Family
- AMD Ryzen 9
- Clocks
- 3.4 / 5.4 GHz
AMD Ryzen 9 PRO 9945 specifications
| Cores | 12 |
|---|---|
| Threads | 24 |
| Core architecture | Zen 5, two CCDs with 12 active cores |
| Clocks | 3.4 GHz base, up to 5.4 GHz boost |
| Cache | 64 MB L3 and 12 MB L2 |
| Default TDP | 65 W |
| Manufacturing process | TSMC 4 nm FinFET, 6 nm I/O die |
| Memory support | DDR5 up to 5600 MT/s, two channels, up to 192 GB |
| PCI Express | PCIe 5.0, 28 lanes (24 usable) |
| Integrated graphics | AMD Radeon Graphics, 2 compute units (up to 2200 MHz) |
| Multiplier | Locked |
| ECC memory | Yes (requires board support) |
| Package | AM5 (LGA1718) |
| Maximum temperature | 95 C |
| Cooler in the box | AMD Wraith Stealth |
Motherboard and chipset compatibility
AMD Ryzen 9 PRO 9945 needs a motherboard with a AM5 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| 800 series | X870E, X870, B850, B840 | Works out of the box |
| 600 series | X670E, X670, B650E, B650, A620 | Needs a BIOS update Needs a BIOS update on boards built before the Ryzen 9000 launch. Check the board maker's CPU support list. |
Board makers publish a CPU support list for every model. Check it for your exact board before buying. Chipset details for AM5.
Recommended GPU pairing
| Recommended tier | High-end 1440p |
|---|---|
| Example GPUs | GeForce RTX 5070, Radeon RX 9070 |
| Target resolution | 1440p high settings |
Twelve Zen 5 cores with PCIe 5.0 lanes and DDR5-5600 fit high-end 1440p cards from 2025. The integrated Radeon Graphics cover office use, while a faster card still works and the balance shifts with game, settings and resolution.
This is a rough match for a new build at the stated resolution, not a limit. A faster card still works and helps at higher resolutions or in games that load the GPU more than the CPU. A slower card is fine for lighter games and office use. The exact balance shifts with the game, the settings and the resolution, so no percentage is given.
AM5 at a glance
| Type | LGA, 1,718 contacts |
|---|---|
| Package size | 40 × 40 mm |
| Introduced | September 2022 |
| Memory | DDR5 only (AMD EXPO profiles for faster kits) |
| Cooler mounting holes | 54 × 90 mm |
What the Ryzen 9 PRO 9945 is
The AMD Ryzen 9 PRO 9945 is a 12-core, 24-thread desktop processor that AMD released on September 16, 2025 as the efficient 12-core entry of the Ryzen PRO 9000 series. It uses the Granite Ridge design with Zen 5 cores on AM5, with a base clock of 3.4 GHz and boost up to 5.4 GHz. The cache totals 64 MB of L3 beside 12 MB of L2 across two complexes, and AMD rates the default TDP at 65 W. The compute cores use TSMC 4 nm FinFET with a 6 nm I/O die.
Twelve cores at 65 W suit compilation, data handling, virtualization hosts and creation stations where thread count matters but heat and noise must stay low. Against the 120 W Ryzen 9 PRO 9955 with the same core count, the 9945 holds lower sustained clocks in long all-core runs while matching it in short bursts. The PRO feature set adds Memory Guard, Secure Processor and DASH manageability for IT control.
Basic display comes from AMD Radeon Graphics with 2 compute units up to 2200 MHz. The multiplier is locked, and AMD lists no support for EXPO, Precision Boost Overdrive or Curve Optimizer on this PRO model. ECC memory is supported when the board provides it, and the maximum operating temperature is 95 C. AMD bundles the Wraith Stealth cooler with boxed versions.
Socket and motherboard compatibility
The 9945 fits the AM5 socket with 1,718 contacts. Boards with 800 series chipsets such as X870E, X870, B850 and B840 accept it out of the box. Boards with 600 series chipsets such as X670E, X670, B650E, B650 and A620 accept it after a BIOS update that adds Ryzen PRO 9000 support. The board maker CPU support list names the minimum version.
A 600 series board built before that support will not start with this chip until firmware is updated. Boards with BIOS Flashback can write firmware without a processor in place, while other boards need a supported older chip for the update step. For offices reusing boards, this check avoids a dead first boot.
The related AMD Ryzen 5 9600X shares the same socket and DDR5 path and gives a 6-core consumer reference point. The 9945 doubles that core count for threaded work while holding the same 65 W class, which is why mainstream B650 and B850 boards handle it well when airflow is sound.
Memory, PCIe and cooling
The memory controller supports DDR5 up to 5600 MT/s with two modules, and slower speeds with four modules, across two channels to 192 GB. AMD lists DDR5-5600 for 2x1R and 2x2R configurations and DDR5-3600 for 4x1R and 4x2R configurations. There is no DDR4 option on AM5. ECC UDIMM is supported when the board wires it, which fits machines that keep large working sets in memory.
The processor provides 28 PCIe 5.0 lanes with 24 usable for devices, typically a graphics slot and NVMe storage at Gen5 speed on boards wired for it. A high-end 1440p card matches the 12-core throughput at 1440p high settings, with fast NVMe alongside for project files. Chipset lanes cover the remaining board devices.
A 65 W default TDP cools easily with the bundled Wraith Stealth or a modest tower cooler. The mounting pattern is the shared 54 by 90 mm of AM4 and AM5, so many existing coolers carry over with AM5 hardware. The CPU cooler compatibility by socket guide covers the patterns and the fixed AM5 backplate rule. Low heat makes this 12-core model a fit for compact workstations.
Upgrade paths
On the same socket the 120 W Ryzen 9 PRO 9955 keeps the same 12 cores with higher sustained limits for towers with stronger cooling. The 16-core Ryzen 9 PRO 9965 adds four cores at 170 W for heavier parallel work. The 8-core Ryzen 7 PRO 9745 drops four cores for general office fleets at the same 65 W. All share boards and DDR5 with a BIOS check.
Buyers who already run 6 or 8-core PRO parts can step to the 9945 for more threads without leaving the 65 W class or changing coolers. That in place upgrade path is the main draw of the efficient 12-core tier.
Coming from AM4, the move means a new board and DDR5 memory, since neither transfers. Some coolers transfer with AM5 hardware. AMD has stated AM5 support through 2029, so the platform keeps later CPU options open.
Frequently asked questions
What socket does the AMD Ryzen 9 PRO 9945 use?
It uses AM5, an LGA socket with 1,718 contacts. It needs an AM5 board with DDR5 memory.
Does the 9945 work on a B650 motherboard?
Yes, after a BIOS update that adds Ryzen PRO 9000 support. 800 series boards accept it out of the box.
What is the difference between the PRO 9945 and the PRO 9955?
Both have 12 cores and 24 threads at 3.4 GHz to 5.4 GHz with 64 MB of L3. The 9945 holds a 65 W envelope with a Wraith Stealth cooler, while the 9955 allows 120 W with no cooler included.
Does the 9945 come with a cooler?
Boxed versions include the AMD Wraith Stealth cooler. Tray versions ship without a cooler for system builders.
Does the 9945 support ECC memory?
Yes, when the board provides ECC support. AMD lists ECC as Yes with board support required.
Sources and verification
- AMD Ryzen 9 PRO 9945 (AMD)
- Ryzen PRO 9945, 9745, 9645 Officially Released (Guru3D)
- AMD Ryzen 9 PRO 9945 Detailed Specifications (CpuTronic)
Facts last checked against these sources on . Page last edited on .