AMD Processor

AMD Ryzen™ 9 PRO 9955

AMD Ryzen™ 9 PRO 9955, up to 5.40 GHz, 12 cores, 64.00 MB cache, 120.00 W TDP

AMD cpu Official Site

Cores Cores

12 Cores

Multitasking and productivity baseline

Max Boost Clock Boost Clock

5.4 GHz

5.40 GHz

Single-core burst performance reference

L3 Cache L3 / Cache

64 MB

64.00 MB

Cache size and access efficiency reference

TDP Power

120 W

120.00 W

Cooling and power planning reference

Specifications

Key Specs

40 items

# of CPU Cores 12 Cores

# of Threads 24

AMD EXPO™ Memory Overclocking Technology No

AMD-V (SVM) Yes

AMD-Vi (I/O MMU Virtualization) Yes

Base Clock 3.40 GHz

CPU Socket AM5

ECC Support Yes (Requires mobo support)

Family Ryzen PRO

Firmware TPM Yes

Form Factor Desktops

Former Codename Granite Ridge AM5

Gpu Cores 2

Gpu Frequency 2200.00 MHz

Gpu Name AMD Radeon™ Graphics

Instruction Set x86-64

L1 Cache 960.00 KB

Launch Date 6/30/2026

Max Memory Speed 2x1R DDR5-5600 2x2R DDR5-5600 4x1R DDR5-3600 4x2R DDR5-3600

Max. Boost Clock 5.40 GHz

Max. Memory 256.00 GB

Max. Operating Temperature (Tjmax) 95.00 °C

Memory Channels 2

Multithreading (SMT) Yes

Name AMD Ryzen™ 9 PRO 9955

PCI Express® Version PCIe® 5.0

PCIe® Lanes 28 , 24

Processor Architecture Zen 5

Processor Technology for CPU Cores TSMC 4nm FinFET

Processor Technology for I/O Die TSMC 6nm FinFET

Series Ryzen PRO 9000 Series

Supported Extensions AES,AMD-V,AVX,AVX2,AVX512,FMA3,MMX-plus,SHA,SSE2,SSE4.2,SSE4A,SSE4.1,SSE3,SSSE3,SSE,x86-64

Supporting Chipsets A620,X670E,X670,B650E,B650,X870,X870E,B840,B850

System Memory Subtype UDIMM

System Memory Type DDR5

TDP 120.00 W

Total L2 Cache 12.00 MB

Total L3 Cache 64.00 MB

UEFI Secure Boot Yes

Unlocked for Overclocking No

FAQ

How should a GPU be paired with Ryzen 9 PRO 9955 for 1080p, 1440p, and 4K gaming? How many cores and threads does Ryzen 9 PRO 9955 have, and is it suitable for gaming and productivity? What cooler does Ryzen 9 PRO 9955 need, and how do gaming and sustained all-core loads differ? What motherboard suits Ryzen 9 PRO 9955, and how should power delivery, memory, and ports be balanced? With 256GB packed into a commercial desktop, is big-model AI residency the PRO 9955's calling card?