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The Intel Xeon W-3275 is a 28-core, 56-thread workstation processor launched in 2019, and it remains a compelling option only when you can buy it affordably with a compatible LGA3647 platform. Its six-channel ECC memory support and 64 PCIe lanes suit demanding workstation configurations, but the CPU’s age, 205 W rating, and specialized motherboard and cooling needs make total platform cost more important than its old $4,449 list price.
What the Xeon W-3275 is—and who it suits
Intel launched the Xeon W-3275 in Q2 2019 as a single-socket Cascade Lake workstation CPU. ServeTheHome reviewer John Lee called it a halo product and characterized it as Intel’s fastest single-socket Xeon W-3200 processor at the time of the October 14, 2019 review. That description captures its original position, not its value against current workstation CPUs.
The W-3275 is best considered by someone assembling or upgrading a compatible used workstation, especially where high core count, ECC memory capacity, and expansion are useful. It is a less straightforward choice for a new build: the processor requires a specific LGA3647 platform, substantial cooling, and compatible memory, so a low CPU asking price alone does not establish a good deal.
Xeon W-3275 specifications
| Specification | Xeon W-3275 |
|---|---|
| Cores / threads | 28 / 56 |
| Base frequency | 2.50 GHz |
| Maximum turbo frequency | 4.40 GHz |
| Turbo Boost Max 3.0 frequency | 4.60 GHz |
| Cache | 38.5 MB |
| Thermal design power (TDP) | 205 W |
| Socket and system configuration | FCLGA3647; one-socket systems |
| Memory | Six DDR4-2933 channels; up to 1 TB ECC memory |
| Expansion | 64 PCIe 3.0 lanes |
These are Intel’s listed product specifications. Intel marks the processor as launched and lists June 30, 2025 as its end-of-servicing-updates date. That date concerns servicing updates; it does not by itself establish whether a used processor or complete system is available, supported by a particular vendor, or suitable for a specific workload. Intel Xeon W-3275 specifications
How fast is the W-3275?
Its 28 cores and 56 threads make parallel workloads the most obvious reason to consider it. Jobs that scale across many CPU threads can benefit from that capacity, while lightly threaded work depends more on per-core responsiveness. The listed clock figures describe the processor’s frequencies; they are not a guarantee that every core sustains a particular speed under every workload, cooling setup, or power condition.
PassMark’s database page reports an average CPU Mark of 39,449 and a single-thread rating of 2,576, marked current to December 7, 2025. Those figures come from submitted PerformanceTest results, not a controlled retest for this article; the page lists 10 samples and labels the margin of error medium. Treat them as a rough cross-system reference rather than a prediction of performance in a particular workstation. PassMark Xeon W-3275 benchmark page
ServeTheHome’s review gives useful historical platform context, but its test configuration is not a current head-to-head comparison. The review system used a Supermicro X11SPA-T motherboard, a Dynatron 4U CPU heatsink, six 32 GB DDR4-2933 RDIMMs, a Samsung PM961 1 TB SSD, and Ubuntu 18.04 LTS. Its 192 GB of memory occupied six of the board’s twelve DIMM slots. Results from that specific configuration should not be treated as a universal performance guarantee. ServeTheHome Xeon W-3275 review
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What motherboard and RAM does it need?
The W-3275 uses FCLGA3647, so a motherboard must explicitly support that socket and the W-3200/Cascade Lake-W processor family. A socket match alone is not enough: verify the specific board’s CPU support and firmware requirements before purchase. The Supermicro X11SPA-T used in ServeTheHome’s test is one documented example, not a requirement.
Rank #3
- PART NUMBER: PK8072205559100
- CPU SERIES: 5TH GEN INTEL XEON SCALABLE ( SILVER 4500 SERIES )
- PROCESSOR CODE NAME: EMERALD RAPIDS
- SOCKETS SUPPORTED: FCLGA4677
- CPU FREQUENCY: 2.00GHZ
The processor supports six-channel DDR4-2933 memory and up to 1 TB of ECC memory. For the six-channel configuration, populate memory in accordance with the motherboard’s manual and supported DIMM rules. The review’s six 32 GB DDR4-2933 RDIMMs provide a concrete 192 GB example; check that a board accepts the particular RDIMM type and capacity, since memory compatibility depends on the motherboard as well as the CPU.
Plan cooling and chassis airflow around a 205 W processor. The review used a Dynatron 4U heatsink, illustrating the sort of workstation-class cooling involved, but buyers should confirm heatsink socket compatibility, chassis clearance, and the system’s airflow rather than assume that any LGA3647 cooler will fit.
Rank #4
- Processor Manufacturer: INTEL
- Processor Core: octacosa-core (28 core)
- Clock Speed: 3.10 GHz
- Overclocking speed: 3.80 GHz
- Direct media interface: 8 gt/s
Is the W-3275 worth buying now?
ServeTheHome reported a $4,449 list price in its October 2019 review, and Tom’s Hardware lists a $4,449 recommended customer price. These are historical launch-era prices, not a current market quote. The relevant question today is the cost of the whole compatible system, not how far a used CPU listing sits below its original price.
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- It may make sense if you already own a verified LGA3647 workstation and need an upgrade, or if a complete used system with suitable memory, board, and cooling is attractively priced.
- Compare alternatives carefully if you are buying a motherboard, memory, cooler, and CPU together. A more recent platform may offer better performance per watt and easier availability, even if the W-3275 remains capable in an existing compatible machine.
- Check workload fit before prioritizing core count. Consider whether your software uses many CPU threads, needs high memory capacity or ECC, or benefits from the platform’s PCIe expansion; also check vendor certification for professional applications.
- Account for operating cost by considering the 205 W TDP, cooling, power supply, and expected sustained workload. TDP is a processor specification, not a complete measurement of system power consumption.
Tom’s Hardware describes Cascade Lake W’s move to LGA3647, six-channel DDR4-2933 support, up to 1 TB of memory, and 64 PCIe 3.0 lanes. That combination can still be useful in a compatible workstation, but the 2019 platform’s capabilities should be weighed against the cost and availability of the complete build. Tom’s Hardware Xeon W-3275 platform context
Quick Recap
Best Value
What to verify before buying used
- Confirm the exact processor model is Xeon W-3275 and the listing is for a production processor, not an engineering sample.
- Check motherboard documentation for W-3275 support, required firmware, memory type, and DIMM population rules.
- Verify the included or separately sourced RAM is supported ECC memory, and compare its capacity and channel population with your workload.
- Check cooler socket support, chassis fit, and airflow for a 205 W CPU.
- Price the complete platform—including board, RAM, cooling, and any needed replacement parts—and compare it with a newer system for your software and workload.
- For marketplace listings, confirm seller reputation, authenticity, return terms, and whether the item is used or an engineering sample.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
