Intel Xeon Platinum 8581C
Recorded as 60 cores / 120 threads with 300MB L3 and 60 x 2MB L2 - a cache size in the same class as Intel's published 85xx Platinum parts, and the reason this SKU is popular for large-cache CPU inference and dense virtualisation. It is an OEM and cloud-custom part: Intel publishes no ARK specification page for it, so only sourced figures appear on this page and every order is confirmed against the physical part. Sourced and tested in Hong Kong.
Fully Tested & Documented · Hong Kong Warehouse Stock · Worldwide Shipping 3–7 Days · 1-Year Warranty
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The Xeon Platinum 8581C, Up Close
Xeon Platinum 8581C - 60-Core OEM Part
Recorded by SiSoftware as 60 cores / 120 threads with 60 x 2MB L2 (120MB) and 300MB L3, detected at 2.1GHz in an October 2024 benchmark run. That cache figure is the headline: 300MB of last-level cache is what makes a CPU like this interesting for large-context inference and memory-heavy virtualisation, where the model or working set is priced against cache and DRAM rather than compute.
Benchmarked on a Dual-Socket LGA4677 Board
The public SiSoftware record for two 8581C processors lists the host machine as a Giga Computing MS73-HB1-000 server with 512GB of DDR5 RDIMMs - a dual-socket LGA4677 board, the socket family shared by Intel's 4th and 5th Gen Xeon Scalable platforms. Because Intel publishes no datasheet for this SKU, we do not print memory channel counts, PCIe lanes or power ratings: those are confirmed against the physical part and your build sheet at order time.
60
cores / 120 threads per CPU
300MB
L3 cache in benchmark record
120MB
L2 cache (60 x 2MB)
Key Specifications
| Component | Specification |
|---|---|
| Processor | Intel Xeon Platinum 8581C (OEM / cloud-custom SKU) |
| Cores / Threads | 60 cores / 120 threads per CPU (SiSoftware benchmark record, Oct 2024) |
| Cache | 300 MB L3 and 60 x 2 MB (120 MB) L2 (SiSoftware benchmark record) |
| Frequency | 2.1 GHz as detected in the SiSoftware record; PassMark separately lists 2.3 GHz clock and 4.0 GHz turbo |
| Platform (as benchmarked) | Two 8581C processors in a Giga Computing MS73-HB1-000 dual-socket server with 512 GB DDR5 RDIMM (SiSoftware system record) |
| Benchmark reference | Five SiSoftware results for the same 8581C part (Oct 2024); PassMark CPU Mark 8,040 and single-thread 3,258 across 3 submissions |
| Core count caveat | PassMark's separate 8581C listing reports 2 cores / 4 threads from a virtualised sample with a high stated margin of error - unusable for core count, and recorded here only so the discrepancy is visible |
| Intel-published specification | None - Intel ARK carries no product page for this SKU; the closest published relative, Xeon Platinum 8580, is listed by Intel with 300 MB cache at 2.00 GHz |
| Specification source | Manufacturer documentation is not published for this SKU; figures above are from SiSoftware Official Benchmark Ranker and PassMark CPU Benchmark, and confirmed per order |
The Xeon Platinum 8581C is an OEM and cloud-custom part, so this table lists only what a named public source records for this exact model string - there is no Intel datasheet to quote, and a specification table is not the place to fill gaps with plausible-looking numbers. Cache, core count and the benchmarked platform come from SiSoftware records for this SKU; the clock figures are given with their source because the two public sources disagree. Memory channels, PCIe lanes and power rating are deliberately absent and are confirmed against the physical part and your build sheet when you order.
The related custom part on this platform is the Intel Xeon Platinum 8559C (48 cores). For Intel-documented specifications, browse the published SKUs in our Intel server CPUs range.
Transparent Pricing
2026 Reference Pricing by Configuration
The Xeon Platinum 8581C is an OEM and cloud-custom SKU, not a retail product. Intel publishes no recommended customer price for it, so there is no list price to quote against and we publish no figure at all - every quote is built from the tray stock we can actually confirm for your quantity. Because Intel also publishes no datasheet for this SKU, the specification is confirmed against your order rather than against an Intel product page, and we confirm both the specification and the platform compatibility with you before the order is final.
Tray / OEM Single Units
On Request
Individually tested OEM tray stock and decommissioned pulls. Custom SKUs arrive in batches rather than steady supply, so availability is confirmed against live stock before we quote.
Matched Pairs
On Request
Matched stepping and microcode pairs for dual-socket LGA4677 builds - the configuration this part is normally deployed in. Tell us your board and platform generation.
Volume Orders (10+ units)
On Request
Multi-unit and repeat orders quoted against live inventory, with freight consolidated from our Hong Kong warehouse.
No price is published for this SKU: it is an OEM and cloud-custom part with no Intel list price, and we will not print an uncollected number. Send us quantity and target platform for a firm quote. Related custom SKU: Xeon Platinum 8559C. Full range: Intel server CPUs.
Origin
Hong Kong Warehouse
Free port — full export documentation
Transit
3–7 Days Air Freight
Tracked, insured, worldwide
Warranty
1-Year Warranty
Diagnostic report in every box
Quality Process
What We Check Before a Xeon Platinum 8581C Ships
Model String and Marking Verification
Heat-spreader marking and OPN are checked against the exact model string on your order. Intel publishes no ARK page for this SKU, so verification is physical plus order-specification rather than a database lookup.
Socket Pad and Substrate Inspection
The land grid array is inspected under magnification for bent contacts, contamination or rework marks - the most common reason a decommissioned server CPU is rejected.
POST, Core and Cache Enumeration
Full 60-core / 120-thread POST on a reference dual-socket board, with every core and memory channel exercised and the reported cache size checked against the record on this page.
Thermal Behaviour Under Load
Load temperatures are logged so units with degraded heat-spreader contact are pulled before shipment. Power ratings are confirmed per batch rather than assumed.
Board and Firmware Compatibility
BIOS and microcode acceptance is confirmed on your board family when you tell us the platform - the practical compatibility test for a custom SKU that has no Intel compatibility list.
Report in the Box
Every unit ships with its per-machine diagnostic report and warranty. Full process: inspection guide.
Frequently Asked Questions
How much does an Intel Xeon Platinum 8581C cost?
We quote it against live tray stock rather than publishing a price. This is an OEM and cloud-custom SKU: Intel publishes no recommended customer price for it, so there is no list price to reference and we will not print a guess. Send us quantity and target platform for a firm quote.
What is the difference between the Xeon Platinum 8581C and the Xeon Platinum 8559C?
Both are OEM and cloud-custom Xeon Platinum parts that Intel does not document publicly, and both are recorded on the FCLGA4677 / LGA4677 socket family. The clearest sourced difference is core count: the 8581C is recorded as 60 cores / 120 threads with 300MB L3 (SiSoftware), while the 8559C is listed as 48 cores / 96 threads at 2.4GHz (PassMark) - roughly 25% more cores and substantially more last-level cache on the 8581C in those records. Neither record is an Intel datasheet and they come from different systems, so treat this as a directional comparison: confirm the exact SKU, stepping, cache configuration and platform support against your order specification, and note that sellers of these parts describe reconfigurable core-count modes, which we verify per batch before shipping.
Why does PassMark report only 2 cores for the Xeon Platinum 8581C?
Because that submission came from a virtualised machine that exposed only 4 threads to the operating system - PassMark itself flags the sample as having a high margin of error. It is not a core-count specification, and we do not use it as one: the core and cache figures on this page come from the SiSoftware records for this SKU, where the part is enumerated as 60C / 120T with 300MB L3. We keep the discrepancy visible rather than quietly dropping the inconvenient source.
Why are there no memory, PCIe or power figures on this page?
Because Intel publishes no datasheet or ARK page for this SKU, and secondary-market listings are not an acceptable source for chip specification. Cache, core count and the benchmarked platform are sourced above; memory channel count, PCIe lane count and TDP are omitted and confirmed against the physical part and your build sheet at order time.
What condition are these CPUs in, and can you ship them worldwide?
Units are graded OEM tray stock and decommissioned server pulls: model marking and OPN verified against your order specification, land array inspected under magnification, full 60-core POST with all memory channels exercised, thermal behaviour logged. Each CPU ships with its diagnostic report and a 1-year warranty, and we ship worldwide from our Hong Kong warehouse with full export documentation - typically 3 to 7 days by express air freight to major markets.
Get a Current Xeon Platinum 8581C Quote
Tell us quantity, your board model and whether the build is single or dual socket. We confirm tray availability, verify the part against your order specification and cache configuration, and reply with a firm quote - usually within one business day.
Request a Quote