Quick Verdict
A heavyweight workstation CPU with excellent multi-threaded throughput and massive I/O, best suited for users who actually need 28 cores and 112 PCIe 5.0 lanes, not for mainstream gaming or office builds.
Overview
Launch
2024
Status
LaunchedGeneration
4th Gen Xeon W (Sapphire Rapids-WS Refresh)
Market
Expert Workstation
The Intel Xeon w7-3555 is a 28-core, 56-thread workstation processor based on the Sapphire Rapids-WS (Golden Cove) architecture, delivering up to 4.8 GHz turbo on an LGA4677 platform with eight channels of DDR5-4800 ECC memory and 112 PCIe 5.0 lanes for high-end workstations and multi-GPU configurations.
Intel’s Xeon w7-3555 slots into the upper mid-range of the Xeon W-3500 lineup. It combines 28 Golden Cove P‑cores with Hyper‑Threading for 56 threads, a 2.7 GHz base and 4.
8 GHz turbo, 75 MB of L3 cache, and an eight‑channel DDR5‑4800 memory controller supporting up to 4 TB of ECC RDIMM memory. The CPU exposes 112 PCIe 5.0 lanes directly, making it a strong fit for multi‑GPU workstations, NVMe storage arrays, and high‑speed networking.
With a 325 W base and 390 W maximum turbo power, it demands robust cooling and a serious power supply, but in return it offers very high throughput for rendering, simulation, and data‑intensive workloads.
Specifications
Performance
Very strong multi‑threaded performance for professional applications; 28 P‑cores with high turbo frequencies and ample cache make short work of rendering, compiles, and data processing.
Excellent for workstation‑class virtualization with many vCPUs, thanks to 56 hardware threads, large memory support, and extensive I/O.
Competent at high refresh 1080p/1440p gaming thanks to strong single‑thread clocks, but not a rational choice for pure gaming builds due to high cost and power draw compared to mainstream CPUs.
325 W base and 390 W turbo power result in high energy use and cooling requirements; efficiency is acceptable only if the I/O and core count are fully utilized.
- •Strong single‑core turbo up to 4.8 GHz benefits high‑FPS gaming.
- •Lack of hybrid E‑cores avoids scheduling oddities compared to client CPUs.
- •Cost and power make it hard to recommend over gaming‑focused desktop CPUs.
- •Best paired with high‑end GPU for GPU‑bound titles where CPU overhead matters.
- •AMX and AVX‑512 provide strong CPU‑side matrix and inference acceleration.
- •No dedicated NPU; AI workloads rely on CPU + GPU combination.
- •Excellent for AI development and small‑scale training where multi‑GPU and large memory matter more than pure CPU TOPS.
Architecture
Intel 7 (10 nm ESF)
Process Node
Sapphire Rapids-WS
Codename
28C / 56T
Core Config
75 MB
L3 Cache
325 W
TDP
Architecture Overview
The Xeon w7-3555 uses the Sapphire Rapids‑WS die, a chiplet‑based implementation of the Golden Cove microarchitecture on Intel’s 7 process. It is designed specifically for single‑socket workstations with an emphasis on I/O bandwidth and memory capacity rather than multi‑socket scalability.
CPU Design
28 homogeneous Golden Cove P‑cores with Hyper‑Threading deliver 56 threads. Each core has a deep out‑of‑order engine and large L2 cache, with a shared 75 MB L3 Smart Cache distributed across the chiplets. There are no E‑cores, which simplifies scheduling for latency‑sensitive professional applications.
Memory Subsystem
An integrated eight‑channel DDR5 memory controller supports DDR5‑4800 RDIMMs up to 4 TB with ECC, providing high bandwidth and RAS features suitable for mission‑critical workstations.
PCIe & I/O
The CPU exposes 112 PCIe 5.0 lanes via the Sapphire Rapids‑112L configuration, enabling multiple x16 GPUs, several x4 NVMe drives, and high‑speed networking without relying on the chipset for primary expansion.
Overclocking
The w7-3555 has a locked multiplier; BCLK‑based overclocking is possible in theory on some boards, but Intel does not position this SKU as an unlocked part, and tuning headroom is limited compared to X‑suffix models.
- Four additional cores (28 vs 24) and 7.5 MB more L3 cache (75 MB vs 67.5 MB) for higher multi‑threaded throughput.
- Same turbo frequency and platform features, with a modest increase in base power (325 W vs 310 W).
- Better fit for users who need more than 24 cores but don’t want to step all the way to 32‑core w7‑3565X.
Key Highlights
- 28 P‑cores with 56 threads for heavy multi‑threaded workloads
- 112 PCIe 5.0 lanes for multi‑GPU and NVMe expansion
- 8‑channel DDR5‑4800 with ECC and up to 4 TB capacity
- Strong AVX‑512 and AMX acceleration for AI and HPC
- Robust RAS and vPro enterprise features
- Single‑socket simplicity with workstation‑class I/O
- Very high power draw (325 W base, 390 W turbo)
- Locked multiplier limits easy overclocking
- Expensive CPU and platform compared to consumer alternatives
- No integrated graphics requires discrete GPU
- Large LGA4677 socket and cooling requirements restrict case and cooler choices
History
The Xeon w7‑3555 belongs to Intel’s Xeon W‑3500 family, a mid‑generation refresh of the Sapphire Rapids‑WS workstation platform launched in early 2023. Sapphire Rapids‑WS itself was Intel’s first chiplet‑based workstation architecture, bringing Golden Cove P‑cores, eight‑channel DDR5, and up to 112 PCIe 5.0 lanes to compete with AMD’s Threadripper PRO in high‑end desktop workstations.
</br>The W‑3500 refresh, announced in August 2024, increased core counts and cache across the stack versus the original W‑3400 series, with the w7‑3555 slotting in as a 28‑core option between the 24‑core w7‑3545 and 32‑core w7‑3565X. It targets professionals who need more threads and memory than W‑2400 parts offer, but don’t require the flagship 44‑ or 60‑core W9 SKUs. Over time, this generation has become a mainstay in OEM workstations from vendors like Lenovo and HP, particularly for configurations that blend multi‑GPU rendering with large‑memory simulation workloads.
Improvements over Previous Generation
- Four additional cores (28 vs 24) and 7.5 MB more L3 cache (75 MB vs 67.5 MB) for higher multi‑threaded throughput.
- Same turbo frequency and platform features, with a modest increase in base power (325 W vs 310 W).
- Better fit for users who need more than 24 cores but don’t want to step all the way to 32‑core w7‑3565X.
Alternatives & Competitors
Should You Buy It?
Recommended for the right buyer
Building a single‑socket workstation that must support multiple high‑end GPUs, large DDR5 ECC memory, and many PCIe 5.0 devices for rendering, simulation, or AI development.
Avoid if…
- Building a pure gaming PC
- Prioritizing low power consumption or small form factor
- Needing maximum per‑core performance in a dual‑socket server
- Budget‑sensitive builds where consumer HEDT or Threadripper offer better value
Use Cases
Interesting Facts
The Xeon W‑3500 series is codenamed Sapphire Rapids‑112L, where 112L denotes the 112 PCIe 5.0 lanes from the CPU.
Sapphire Rapids‑WS is Intel’s first workstation family to use a chiplet design with Golden Cove cores on Intel 7.
The w7-3555 fills the gap between the 24‑core w7‑3545 and the 32‑core w7‑3565X in Intel’s Xeon W‑3500 stack.
This generation introduced AMX (Advanced Matrix Extensions) to Xeon W, significantly improving CPU‑side AI performance.
Unlike client hybrid CPUs, Sapphire Rapids‑WS uses only P‑cores, avoiding E‑cores entirely for consistent workstation performance.
Lenovo’s ThinkStation P7 lists the w7‑3555 as a CPU option, confirming real OEM availability in prebuilt workstations.
The CPU’s 75 MB L3 cache is carved from the same 82.5 MB per‑tile cache as higher‑core SKUs, with some regions disabled.
Intel’s official recommended customer price for the w7‑3555 is around $2,573, but street prices vary significantly.
PassMark lists the w7‑3555 with a CPU Mark around 67,754, making it one of the faster workstation‑class CPUs.
Even though it’s a workstation CPU, some enthusiasts consider LGA4677 for high‑core‑count home servers and homelabs.
People Also Ask
Is the Intel Xeon w7-3555 good for gaming?
It can deliver high refresh‑rate gaming thanks to its 4.8 GHz turbo, but it’s overpriced and power‑hungry compared to mainstream gaming CPUs. Choose it only if you also need workstation features.
What socket does the Xeon w7-3555 use?
It uses the LGA4677 socket (FCLGA4677), specifically the Intel Xeon W‑3400/W‑3500 workstation platform.
How much memory does the Xeon w7-3555 support?
Up to 4 TB of DDR5‑4800 RDIMM memory with ECC across eight channels, according to Intel’s official specifications.
How many PCIe lanes does the Xeon w7-3555 have?
112 PCIe 5.0 lanes directly from the CPU, as part of the Sapphire Rapids‑112L configuration.
Does the Xeon w7-3555 have integrated graphics?
No, it has no integrated GPU; a discrete graphics card is required for display output.
Can you overclock the Xeon w7-3555?
The multiplier is locked. Some boards may allow BCLK adjustment, but it is not an unlocked SKU like the X‑suffix models.
What is the difference between Xeon w7-3555 and w7-3545?
The w7‑3555 has four more cores (28 vs 24), 7.5 MB more L3 cache (75 MB vs 67.5 MB), and a slightly higher base power (325 W vs 310 W); otherwise they share the same platform and feature set.
Is Xeon w7-3555 better than AMD Threadripper PRO for workstations?
It depends on the workload and price. Threadripper PRO often offers higher per‑core performance and better value, but the w7‑3555 provides strong multi‑threaded performance and 112 PCIe 5.0 lanes for I/O‑heavy configs.
What cooling does the Xeon w7-3555 need?
With a 325 W base and 390 W turbo power, Intel and system integrators typically recommend high‑end air coolers or 280–360 mm AIO liquid coolers for sustained workloads.
Is the Xeon w7-3555 obsolete in 2026?
Not for workstations; it remains a capable high‑core‑count CPU on a current platform, but newer Xeon 600‑series and Threadripper generations have since raised the bar for performance and efficiency.
Frequently Asked Questions
Does the Xeon w7-3555 support ECC memory?
Yes, it supports DDR5 ECC RDIMMs as part of the Xeon W‑3500 platform’s eight‑channel memory controller.
Can I use the Xeon w7-3555 in a dual‑CPU workstation?
No, it is a 1S‑only SKU; the Xeon W‑3400/W‑3500 platform is designed for single‑socket workstations only.
What chipset does the Xeon w7-3555 require?
It uses the Intel W790 chipset for Xeon W‑3400/W‑3500 workstations, paired with the LGA4677 socket.
Is the Xeon w7-3555 unlocked for overclocking?
No, the multiplier is locked. Only X‑suffix Xeon W SKUs (like w7‑3565X) are officially unlocked for overclocking.
What workloads benefit most from the Xeon w7-3555?
3D rendering, simulation, multi‑GPU AI development, virtualization, and data analytics that benefit from many cores, large memory, and many PCIe lanes.
Does the Xeon w7-3555 have Intel vPro?
Yes, it supports Intel vPro Enterprise, providing hardware‑enhanced security and remote management features for enterprise environments.
Can I build a gaming PC with Xeon w7-3555?
Technically yes, but it’s not recommended; the cost and power are hard to justify when consumer CPUs offer similar or better gaming performance for less money.
How does the Xeon w7-3555 compare to Xeon w7-3565X?
The w7‑3565X has four more cores (32 vs 28), slightly more cache (82.5 MB vs 75 MB), and a higher base power (335 W vs 325 W), with otherwise similar platform features.
What is the maximum turbo power of the Xeon w7-3555?
Intel specifies a maximum turbo power of 390 W, which the CPU can draw under heavy multi‑core workloads when cooling and motherboard power delivery allow.
Is the Xeon w7-3555 suitable for small form factor builds?
Not really; the 325 W TDP and large LGA4677 socket, plus the need for robust cooling, make it best suited for full‑tower or rackmount workstations.