Quick Verdict
An extremely capable dual‑socket server CPU with best‑in‑class core count and memory bandwidth for its generation, best suited for organizations that can utilize its 120 cores and 12 memory channels rather than treating it as a general‑purpose compute node.
Overview
Launch
2025
Status
LaunchedGeneration
Xeon 6 (Granite Rapids-AP)
Market
Server / Data Center
The Intel Xeon 6978P is a 120-core, 240-thread server processor based on the Granite Rapids-AP architecture, designed for large-scale virtualization, in-memory databases, and dense HPC and AI consolidation workloads in dual-socket platforms.
The Intel Xeon 6978P is a 120‑core, 240‑thread server CPU with a 2.1 GHz base clock, up to 3.9 GHz turbo, 504 MB of L3 cache, 12 DDR5/MRDIMM channels up to 8800 MT/s, and 96 PCIe 5.
0 lanes in an FCLGA7529 socket. It is designed for dual‑socket servers running large in‑memory databases, virtualization, HPC, and AI workloads, and sits just below the 128‑core 6980P in Intel’s Xeon 6900P lineup.
Specifications
Performance
No standardized desktop productivity benchmarks are available; performance is highly workload‑dependent and best evaluated with server‑relevant benchmarks.
Designed for large‑scale virtualization with 120 cores and 12 memory channels, but specific scores are platform‑dependent and not published as a single metric.
Not applicable; this is a server CPU without integrated graphics and is not intended or validated for gaming use cases.
500 W TDP for 120 cores results in competitive performance per watt for parallel workloads, but no official efficiency score is published.
- •No integrated graphics
- •Server platform, not validated for gaming
- •Client‑side gaming not a target use case
- •Supports Intel AMX, DL Boost, and AVX‑512 for CPU‑based AI inference
- •No integrated AI accelerator beyond CPU instructions
- •Best used as a host CPU for discrete AI accelerators
Architecture
Intel 3
Process Node
Granite Rapids-AP
Codename
120C / 240T
Core Config
504 MB
L3 Cache
500 W
TDP
Architecture Overview
Granite Rapids-AP is the high‑core‑count, high‑memory‑bandwidth variant of Intel’s Xeon 6 server platform, using P‑cores only and the larger LGA7529 socket to reach up to 128 cores and 12 memory channels in dual‑socket configurations.
CPU Design
120 performance cores with Hyper‑Threading, delivering up to 240 threads. Core frequencies are managed via Intel Turbo Boost Technology 2.0 and Speed Select Technology, allowing administrators to choose between higher base frequency (Server Mode) or lower TDP (Compute Mode) profiles.
Memory Subsystem
12‑channel DDR5 memory controller supporting DDR5‑6400 and MRDIMM‑8800, with a maximum capacity of 3 TB when using 256 GB DIMMs. The wide memory subsystem is optimized for workloads that require high bandwidth and low latency access to very large datasets.
PCIe & I/O
96 PCIe 5.0 lanes directly from the CPU in dual‑socket systems, enabling substantial I/O bandwidth for GPUs, SmartNICs, DPU/ IPUs, and NVMe storage arrays. Lane allocation is shared between sockets and depends on the platform design.
Overclocking
Multiplier is locked; overclocking is not supported. Frequency tuning is done via Intel Speed Select Technology profiles and BIOS settings rather than manual overclocking.
- Move from 10nm Enhanced to Intel 3 process
- Increase from 60 to 120 P‑cores per socket
- 12‑channel memory vs 8‑channel in Sapphire Rapids
- PCIe 5.0 vs PCIe 4.0 from the CPU
- Introduction of SST‑PP performance profiles
Key Highlights
- Very high core count (120 cores / 240 threads)
- 12 memory channels with DDR5 and MRDIMM support
- 96 PCIe 5.0 lanes for I/O‑heavy server designs
- Intel 3 process improves density and efficiency
- Strong platform for in‑memory databases and virtualization
- 500 W TDP requires robust cooling and power delivery
- Expensive and typically sold only through OEM channels
- Performance per core is modest compared to lower‑core Xeons
- Limited use outside large server deployments
- No integrated graphics or client‑side validation
History
The Xeon 6978P emerged as part of Intel’s Granite Rapids‑AP generation, which represents the company’s push to reclaim leadership in high‑core‑count server CPUs against AMD’s EPYC lineup. Granite Rapids‑AP introduced the LGA7529 socket and the Avenue City platform to enable up to 128 P‑cores and 12 memory channels in dual‑socket servers. Intel positioned the 6900P series, including the 6978P, for the most demanding data center workloads such as large in‑memory databases, virtualization, and HPC, where earlier Xeon Scalable processors had fallen behind EPYC in core count and memory bandwidth.
The 6978P itself fills the gap between the 96‑core 6972P and the flagship 128‑core 6980P, offering 120 cores at a slightly lower price point while retaining the same 504 MB L3 cache and 500 W TDP. Its introduction also marked a broader shift toward Intel’s Intel 3 process and a renewed emphasis on integrated accelerators and security features, reflecting the growing importance of AI, confidential computing, and software‑defined infrastructure in modern data centers.
Improvements over Previous Generation
- Move from 10nm Enhanced to Intel 3 process
- Increase from 60 to 120 P‑cores per socket
- 12‑channel memory vs 8‑channel in Sapphire Rapids
- PCIe 5.0 vs PCIe 4.0 from the CPU
- Introduction of SST‑PP performance profiles
Alternatives & Competitors
Should You Buy It?
Recommended for the right buyer
Dual‑socket servers running memory‑intensive, highly parallel workloads such as large in‑memory databases, virtualization, or HPC where core count and memory bandwidth are the primary bottlenecks.
Avoid if…
- Building a small business or edge server with light workloads
- Your workloads are single‑threaded or lightly threaded
- You prioritize power efficiency over absolute performance
- You need a client‑style desktop or gaming PC
Use Cases
Interesting Facts
The 6978P is part of Intel’s Xeon 6900P series, which uses the Granite Rapids‑AP die and the LGA7529 socket to reach higher core counts than the mainstream Xeon 6700P/6500P lines.
Despite having 120 cores, the 6978P has the same 504 MB L3 cache as the 128‑core 6980P, meaning slightly less cache per core than its bigger sibling.
It supports Intel Speed Select Technology Performance Profiles, allowing administrators to choose between Server Mode (higher base frequency) and Compute Mode (lower base frequency, same TDP).
Maximum memory capacity is 3 TB when using 256 GB DIMMs across 12 channels, which is particularly attractive for in‑memory databases like SAP HANA.
Granite Rapids‑AP is Intel’s first “Advanced Performance” Xeon platform since Cascade Lake‑AP, reviving the AP branding for very high‑core‑count server SKUs.
The CPU supports Intel AMX (Advanced Matrix Extensions) and AVX‑512, which accelerate matrix operations for AI and HPC workloads on the CPU.
In dual‑socket configurations, the two 6978P CPUs are interconnected via Intel UPI links running at 24 GT/s, with up to six links enabled.
Typical retail listings price the 6978P around several thousand US dollars, making it one of the most expensive mainstream server CPUs.
HPE and other server vendors offer the 6978P as a processor kit specifically for high‑end compute platforms like the ProLiant Compute XD series.
Unlike client CPUs, the 6978P is not paired with a consumer chipset; instead, it is integrated into vendor‑specific server platforms with custom power and cooling designs.
People Also Ask
Is Intel Xeon 6978P good for gaming?
No. It is a server processor without integrated graphics, and it is not designed or validated for gaming. Client‑oriented CPUs are far more suitable.
How much memory does the Xeon 6978P support?
Up to 3 TB of DDR5/MRDIMM memory using twelve channels, when 256 GB DIMMs are populated.
What socket does the Xeon 6978P use?
FCLGA7529, also known as LGA7529, which is part of the Avenue City platform for Granite Rapids‑AP processors.
How many PCIe lanes does the Xeon 6978P have?
96 PCIe 5.0 lanes from the CPU in dual‑socket systems, though actual lane allocation depends on the motherboard design.
What is the difference between Xeon 6978P and 6980P?
The 6980P has 128 cores and 256 threads, while the 6978P has 120 cores and 240 threads. Both share the same 504 MB L3 cache, memory support, and TDP.
Is the Xeon 6978P unlocked for overclocking?
No. The multiplier is locked; frequency is controlled via Intel Speed Select Technology and BIOS settings rather than manual overclocking.
What process node is the Xeon 6978P built on?
Intel 3, which is Intel’s 3nm‑class node used for Granite Rapids‑AP server processors.
Can the Xeon 6978P be used in a desktop motherboard?
No. It requires a server platform with the LGA7529 socket, appropriate VRMs, and firmware support; it is not compatible with consumer desktop boards.
What workloads is the Xeon 6978P best for?
Large in‑memory databases, virtualization, HPC simulations, and consolidated AI inference where many cores and high memory bandwidth are critical.
Does the Xeon 6978P have integrated graphics?
No. Like most Xeon Scalable processors, it requires a discrete GPU or ASIC for graphics or compute acceleration.
Frequently Asked Questions
Does the Intel Xeon 6978P support DDR4 memory?
No, it supports only DDR5 and MRDIMM memory via its 12‑channel controller.
What is the base frequency of the Xeon 6978P?
2.1 GHz base frequency, with up to 3.9 GHz max turbo depending on workload and SKU configuration.
Can two Xeon 6978P CPUs be used together?
Yes, the 6978P supports two‑socket (2S) configurations with Intel UPI interconnects at 24 GT/s.
Is the Xeon 6978P suitable for small business servers?
Generally no; it is overkill and too expensive for most small business workloads. Lower‑core Xeon 6 or previous‑generation Xeon Scalable CPUs are more appropriate.
What accelerators are integrated in the Xeon 6978P?
It includes Intel QAT, DLB, DSA, and IAA accelerators, plus Intel AMX and DL Boost for AI and cryptographic workloads.
How much power does the Xeon 6978P consume?
Its TDP is 500 W, which must be accommodated by the server’s power supply and cooling solution.
What security features does the Xeon 6978P support?
Intel TDX, SGX, Total Memory Encryption, Crypto Acceleration, CET, and TXT, among others, providing hardware‑rooted security for cloud and enterprise workloads.
Is the Xeon 6978P good for virtualization?
Yes, with 120 cores and 12 memory channels it is well‑suited for hosting many virtual machines, though specific VM counts depend on the workload and configuration.
Can I buy the Xeon 6978P as a retail boxed CPU?
It is mainly sold through OEM and channel partners as a tray processor; boxed retail availability is very limited.
What is the typical use case for the Xeon 6978P?
Dual‑socket servers running large in‑memory databases, virtualized infrastructure, HPC clusters, or consolidated AI inference where high core count and memory bandwidth are required.