Quick Verdict
A high‑core‑count, cache‑rich server CPU tailored for GPU‑accelerated AI and HPC platforms, offering excellent memory bandwidth and I/O, but with a 350 W TDP and premium pricing that makes sense primarily in dense multi‑GPU servers where its features are fully utilized.
Overview
Launch
2025
Status
LaunchedGeneration
6th Gen Intel Xeon Scalable (Xeon 6 P-Cores)
Market
2S Server / AI Host CPU
The Intel Xeon 6776P is a 64-core, 128-thread server processor based on the Granite Rapids-SP architecture, designed for dual-socket AI, HPC, and database servers that need high core counts, large cache, and wide PCIe 5.0 connectivity.
Intel’s Xeon 6776P sits in the 6700P P‑core lineup with 64 cores, 128 threads, a 2.3 GHz base and 3.9 GHz max turbo, plus a 336 MB L3 cache and 88 PCIe 5.
0 lanes. It supports 8‑channel DDR5 and MRDIMM memory up to 4 TB, and is designed for 2S servers hosting large GPU accelerators, in‑memory databases, and HPC workloads. Its 350 W TDP and enterprise feature set make it a strong fit for AI host nodes and virtualized infrastructure, though it is overkill for lightly‑threaded or purely throughput‑oriented tasks that could use smaller, cheaper Xeon 6 SKUs.
Specifications
Performance
Strong multi‑threaded throughput for server workloads; specific application scores not available without official benchmarks.
Well‑suited to large‑scale virtualization thanks to high core count, memory capacity, and I/O, but numerical scores are not published for this SKU.
Not targeted at gaming; single‑thread performance is reasonable for a server CPU, but gaming is not a design target and benchmark data is unavailable.
350 W TDP at 64 cores results in moderate performance‑per‑watt compared to lower‑core Xeon 6 SKUs; efficiency is acceptable when the cores and I/O are fully utilized.
- •Server‑focused processor with no gaming‑oriented benchmarks.
- •Single‑thread boost up to 3.9 GHz is decent, but gaming is not a target use case.
- •Use desktop or workstation CPUs for gaming‑centric builds.
- •Optimized as a host CPU for GPU‑accelerated AI systems (e.g., NVIDIA DGX B300).
- •Supports Intel AMX, DL Boost, and AVX‑512 for CPU‑side AI inference.
- •Best leveraged orchestrating GPUs rather than as a standalone AI accelerator.
Architecture
Intel 3 (7nm-class)
Process Node
Granite Rapids-SP
Codename
64C / 128T
Core Config
336 MB
L3 Cache
350 W
TDP
Architecture Overview
Granite Rapids-SP is Intel’s 6th‑generation Xeon Scalable server platform, using a chiplet‑based design with performance cores (P‑cores) on an Intel 3 process. It emphasizes high core counts, large caches, and wide I/O for AI and HPC servers.
CPU Design
The Xeon 6776P uses 64 Redwood Cove P‑cores arranged in compute tiles, each core supporting Hyper‑Threading for 128 threads. Cache hierarchy includes 2 MB L2 per core and a shared, tile‑level L3 totaling 336 MB, with some L3 capacity allocated at the tile level rather than strictly per core.
Memory Subsystem
An 8‑channel integrated memory controller supports DDR5 and MRDIMM DIMMs, with official speeds up to DDR5‑6400 and MRDIMM‑8800, and a maximum supported speed of 8000 MT/s. Up to 4 TB of memory is supported in a 2‑socket configuration, providing high bandwidth for AI and HPC datasets.
PCIe & I/O
Up to 88 PCIe 5.0 lanes are exposed from the CPU, with additional platform‑level lanes from the PCH. In 1‑socket Granite Rapids‑SP platforms, some UPI links can be repurposed as PCIe 5.0 lanes, enabling high‑density GPU and NVMe connectivity.
Overclocking
The multiplier is locked; overclocking is not supported. Intel instead provides Priority Core Turbo (PCT) and Speed Select Technology (SST) to prioritize up to 8 cores at higher frequencies (up to 4.6 GHz) for latency‑sensitive workloads.
- Roughly double the L3 cache (336 MB vs 60 MB) and significantly more L2 cache per core.
- Move from PCIe 4.0 to PCIe 5.0 and from 6‑channel to 8‑channel DDR5/MRDIMM memory.
- Higher core count (64 vs 40) and higher per‑socket performance in multi‑threaded workloads.
- Integration of accelerators (QAT, DLB, DSA, IAA, AMX) by default in Xeon 6700P.
Key Highlights
- 64 cores and 128 threads for highly parallel workloads
- 336 MB L3 cache reduces memory bottlenecks
- 8‑channel DDR5/MRDIMM with up to 4 TB memory capacity
- 88 PCIe 5.0 lanes for GPUs, NICs, and NVMe
- Built‑in accelerators (QAT, DLB, DSA, IAA, AMX) for AI, networking, and analytics
- Priority Core Turbo to boost critical threads
- High 350 W TDP requires robust cooling and power delivery
- Premium pricing typical of high‑core‑count Xeon SKUs
- Locked multiplier; no overclocking headroom
- Overkill for lightly‑threaded or small‑scale workloads
- No integrated graphics; relies on discrete or BMC graphics
History
Intel introduced the Xeon 6 family in 2024, starting with E‑core‑only Sierra Forest parts at Computex in June 2024, focused on throughput and density. The P‑core‑based Granite Rapids‑SP lineup, including the Xeon 6700P and 6500P series, was launched later, on February 24, 2025, as the performance‑oriented branch for AI and HPC. The Xeon 6776P is one of the 64‑core, 350 W SKUs in this 6700P P‑core family, designed specifically to serve as a host CPU in GPU‑accelerated AI systems such as NVIDIA’s DGX B300.
It reflects Intel’s strategy to combine high core counts, large caches, and integrated accelerators to compete with AMD’s EPYC 9004 and 9005 series in AI and data center markets.
Improvements over Previous Generation
- Roughly double the L3 cache (336 MB vs 60 MB) and significantly more L2 cache per core.
- Move from PCIe 4.0 to PCIe 5.0 and from 6‑channel to 8‑channel DDR5/MRDIMM memory.
- Higher core count (64 vs 40) and higher per‑socket performance in multi‑threaded workloads.
- Integration of accelerators (QAT, DLB, DSA, IAA, AMX) by default in Xeon 6700P.
Alternatives & Competitors
Should You Buy It?
Recommended for the right buyer
Dual‑socket AI or HPC servers with multiple high‑end GPUs where you need 64 cores, large cache, and maximum PCIe 5.0 lanes for I/O density.
Avoid if…
- Building a small 1S server with moderate I/O needs
- Prioritizing performance per watt over absolute performance
- Running lightly‑threaded enterprise apps that don’t exploit 64 cores
- Seeking a gaming or desktop workstation CPU
Use Cases
Interesting Facts
The Xeon 6776P is used as the host CPU in NVIDIA’s DGX B300 AI systems, highlighting its role in GPU‑centric AI servers.
Granite Rapids‑SP can repurpose UPI links as additional PCIe 5.0 lanes in single‑socket configurations, boosting I/O density.
ServeTheHome reports that Granite Rapids‑SP SKUs with 336 MB L3 cache provide about 4.2 MB L3 and 2 MB L2 per core, closing the cache gap with AMD EPYC.
Intel positions Xeon 6700P P‑core CPUs as offering double the memory bandwidth and AI acceleration in every core compared to 5th‑Gen Xeon Scalable.
The 6776P is a 64‑core, 350 W part in a lineup that also includes 36‑core and 86‑core SKUs, letting enterprises right‑size core count and power.
People Also Ask
What is the Intel Xeon 6776P used for?
It is designed as a host CPU for dual‑socket AI and HPC servers, especially those using multiple GPUs, such as NVIDIA DGX B300 systems.
How many PCIe lanes does the Xeon 6776P have?
Intel ARK lists 88 PCIe 5.0 lanes from the CPU in a dual‑socket configuration.
Does the Xeon 6776P have integrated graphics?
No; it relies on discrete GPUs or BMC graphics for display output.
What memory does the Xeon 6776P support?
It supports DDR5 and MRDIMM DIMMs, with official speeds up to DDR5‑6400 and MRDIMM‑8800, and a max speed of 8000 MT/s.
Is the Xeon 6776P good for gaming?
It can run games at a basic level, but it is not optimized for gaming; desktop or workstation CPUs are better choices.
What is the TDP of the Xeon 6776P?
The thermal design power is 350 W.
Can you overclock the Xeon 6776P?
No, the multiplier is locked; Intel provides Priority Core Turbo instead for selective frequency boosts.
What is the difference between Xeon 6776P and 6774P?
Both are 64‑core, 336 MB L3, 350 W CPUs, but the 6774P has a higher base clock (2.5 GHz vs 2.3 GHz).
Which platform does the Xeon 6776P use?
It uses the Intel Xeon 6 Granite Rapids‑SP platform with the LGA4710 socket.
How much L3 cache does the Xeon 6776P have?
336 MB of shared L3 cache.
Frequently Asked Questions
Does the Xeon 6776P support ECC memory?
Yes, ECC is supported; Intel ARK explicitly lists ECC memory support for this SKU.
What is Priority Core Turbo on the 6776P?
PCT allows up to 8 cores to run at a higher turbo frequency (up to 4.6 GHz on this SKU) to improve performance for latency‑sensitive threads while others run at base frequency.
What accelerators are integrated into the Xeon 6776P?
Intel lists QuickAssist Technology (QAT), Dynamic Load Balancer (DLB), Data Streaming Accelerator (DSA), In‑Memory Analytics Accelerator (IAA), and Advanced Matrix Extensions (AMX) as integrated accelerators.
Is the Xeon 6776P a unlocked CPU?
No, the multiplier is locked; overclocking is not supported.
Can I run the Xeon 6776P in a single‑socket server?
Yes, but some UPI links will be repurposed as PCIe 5.0 lanes in 1S configurations, changing the lane distribution compared to dual‑socket use.
What is the maximum memory capacity with Xeon 6776P?
Up to 4 TB of memory is supported in a 2‑socket system, depending on DIMM type and configuration.
What instruction extensions does the 6776P support?
Intel lists AMX, SSE4.2, AVX, AVX2, and AVX‑512, along with two AVX‑512 FMA units.
Does the Xeon 6776P support CXL?
Granite Rapids‑SP as a family supports CXL 2.0; Intel ARK does not list CXL explicitly for this SKU, but the platform supports it.
Is the Xeon 6776P suitable for virtualization?
Yes, with high core count, large memory, and extensive I/O, it is well‑suited for virtualized infrastructure and VDI back‑ends.
What cooling is recommended for the Xeon 6776P?
High‑end air or liquid cooling solutions designed for 350 W+ server CPUs are recommended, following Intel’s thermal guidelines.