Intel Xeon Scalable decoded: generations 1 to 6 and reading a SKU
Intel's server processors have carried the same broad numbering logic since 2017, so once you can read one part number you can place almost any of them — its tier, its generation and the workload it was tuned for — without reaching for a spec sheet. That matters when you are comparing a refurbished chip against a new one, or checking that a CPU will actually fit the board you own. This guide decodes the scheme end to end, from the first-generation Skylake parts still common on the second-hand market to the 2024 Xeon 6 reset.
How to read a Xeon Scalable part number
From 2017 to 2023 Intel branded the line Intel Xeon Scalable and sorted it into four metal tiers — Bronze, Silver, Gold and Platinum — each part carrying a four-digit processor number and, sometimes, a trailing letter. Take Xeon Gold 6338:
| Position | In "6338" | What it tells you |
|---|---|---|
| 1st digit | 6 | Product tier: 8 (and 9) = Platinum, 6 = Gold, 5 = Gold, 4 = Silver, 3 = Bronze |
| 2nd digit | 3 | Generation: 1 = Skylake, 2 = Cascade Lake, 3 = Ice Lake, 4 = Sapphire Rapids, 5 = Emerald Rapids |
| 3rd–4th digits | 38 | SKU / relative position within the tier — a larger number is generally more capable, but it is not a feature code |
| Suffix (optional) | — | Workload or configuration optimisation (see the suffix table below) |
So Gold 6338 reads as a Gold-tier, 3rd Generation (Ice Lake) processor, with "38" placing it inside the Gold range. Intel is explicit that the last two digits "do not represent any specific feature" and that "in general, the better processor has a larger SKU number." Checked against Intel ARK, the Gold 6338 is a 32-core, 64-thread Ice Lake part with 48 MB of L3 cache, a 205 W TDP, eight DDR4-3200 memory channels and 64 lanes of PCIe 4.0.
The four tiers
| Tier | First digit | Positioning |
|---|---|---|
| Platinum | 8 (and 9) | Top bin: highest core counts and frequencies, largest multi-socket scalability |
| Gold | 6 and 5 | Mainstream performance for two- and four-socket servers |
| Silver | 4 | Mid-range dual-socket workloads |
| Bronze | 3 | Entry level for small-business and basic storage servers |
Socket scalability is not fixed by tier alone — it also depends on the SKU and its suffix. The Database & Analytics H parts, for example, are the 4th- and 5th-Generation SKUs that scale beyond two sockets (to four or eight), yet they remain fully usable in an ordinary two-socket server, so the flagship Platinum 8490H runs happily in a 2-socket chassis. Always confirm the exact model.
The six generations at a glance
The second digit dates the chip, but the practical differences — socket, memory and PCIe — step up with each generation. Every figure below is from the representative SKU's Intel ARK page.
| Gen | Code name | Launch | Socket | Max cores / socket | Memory | Max PCIe / socket | Example |
|---|---|---|---|---|---|---|---|
| 1st | Skylake-SP | 2017 | FCLGA3647 | 28 (Platinum 8180) | 6-ch DDR4-2666 | PCIe 3.0, 48 lanes | Platinum 8180 |
| 2nd | Cascade Lake | 2019 | FCLGA3647 | 28 (Platinum 8280) | 6-ch DDR4-2933 | PCIe 3.0, 48 lanes | Platinum 8280 |
| 3rd | Ice Lake-SP | 2021 | FCLGA4189 | 40 (Platinum 8380) | 8-ch DDR4-3200 | PCIe 4.0, 64 lanes | Platinum 8380 / Gold 6338 |
| 4th | Sapphire Rapids | 2023 | FCLGA4677 | 60 (Platinum 8490H) | 8-ch DDR5-4800 | PCIe 5.0, 80 lanes | Platinum 8490H |
| 5th | Emerald Rapids | 2023 | FCLGA4677 | 64 (Platinum 8592+) | 8-ch DDR5-5600 | PCIe 5.0, 80 lanes | Platinum 8592+ |
| 6th | Granite Rapids / Sierra Forest | 2024 | FCLGA7529 (6900) / FCLGA4710 (6700) | 128 P-core (Xeon 6980P) / 288 E-core (6900E) | 12-ch DDR5-6400, MRDIMM to 8800 (6900) | PCIe 5.0, 96 lanes (6900) | Xeon 6980P / 6780E |
Two points a buyer lives or dies by:
- A CPU only fits the socket it was built for. Skylake and Cascade Lake share FCLGA3647; Ice Lake moved to FCLGA4189; Sapphire and Emerald Rapids share FCLGA4677 (Emerald drops into a Sapphire board with a firmware update); Xeon 6 uses two new sockets. You cannot cross generations that use different sockets.
- The specialised 2nd-Gen 9200-series ("Cascade Lake-AP") pushed core counts above the mainstream 8200 line via a dual-die package, but it was an OEM-only, BGA (soldered) part — not something you retrofit.
Suffix letters
Intel appends a letter for parts tuned to a workload or a configuration. These are Intel's stated definitions for the 4th and 5th Generations:
| Suffix | Meaning |
|---|---|
| N | Optimised for communications / networking / NFV |
| V | Optimised for SaaS cloud environments |
| T | Up to 10-year reliability and higher T-case (extended thermal / long-life) |
| M | Optimised for AI and media-processing workloads |
| U | Supported in one-socket configurations only |
| S | Storage-optimised, with the full accelerator set (DSA, QAT, DLB) enabled |
| P | Optimised for IaaS cloud environments |
| H | Database & Analytics-optimised, and the SKUs that scale beyond two sockets (to 4S / 8S) |
| Q | Lower T-case, targeted at liquid cooling |
| + | "Feature plus" — one of each accelerator enabled |
A caution for the second-hand market: some letters meant different things in the earlier generations. Most notably, M originally marked a larger supported-memory tier — the 1st-Gen Platinum 8180M lifted the maximum memory to 1.5 TB versus the base 8180. When you are checking an older chip, read the exact part on Intel ARK rather than assuming a letter carries its modern meaning.
Xeon 6: the 2024 reset
With the sixth generation Intel retired both the "Scalable" name and the Bronze/Silver/Gold/Platinum tiers, rebranding to Intel Xeon 6 and splitting the line into two core types:
- P-cores ("Granite Rapids") — full-performance cores for latency-sensitive, HPC, database and general workloads. Suffix P.
- E-cores ("Sierra Forest") — smaller efficiency cores that pack far more cores per socket for cloud-native, scale-out density. Suffix E.
The number now reads as 6 (the Xeon 6 brand) + a series digit (9 = 6900, 7 = 6700, 5 = 6500, 3 = 6300) + relative SKU digits + the P or E core-type suffix. The series digit also fixes the platform:
- 6900 series (Socket FCLGA7529): 12 DDR5 memory channels (DDR5-6400, MRDIMM to 8800 MT/s), 96 lanes of PCIe 5.0, up to 128 P-cores or 288 E-cores. The flagship Xeon 6980P is a 128-core / 256-thread part with 504 MB of L3 and a 500 W TDP (it shipped in September 2024; the 288-core E-core Xeon 6900E followed in 2025).
- 6700 series (Socket FCLGA4710): 8 DDR5 channels and 88 lanes of PCIe 5.0. The E-core Xeon 6780E carries 144 cores, 108 MB of L3 and a 330 W TDP.
Because the 6900 and 6700 use different sockets, P-core and E-core parts are not interchangeable across platforms — but within a platform they share it.
Buying in South Africa: refurb versus new
- The refurbished sweet spot is generations 1–3. Skylake and Cascade Lake (FCLGA3647) and Ice Lake (FCLGA4189) parts are plentiful and give you serious core counts per rand — ideal for virtualisation hosts where you are not paying per core for software. Generations 4–6 are largely the new-build tier.
- Match the CPU to the socket before you buy. A 3rd-Gen Ice Lake chip will not sit in a 2nd-Gen board. The one easy in-place upgrade on Intel is Sapphire → Emerald Rapids on FCLGA4677.
- Let the suffix guide the match — N for networking appliances, S for storage nodes, T where long service life and thermal headroom matter, and H for database and analytics.
- Cost the software, not just the silicon. VMware, Windows Server and SQL Server are all licensed per physical core, so a high-core Platinum can cost far more to license than a leaner part. That trade-off is covered in our Xeon-versus-EPYC guide.
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