Intel Xeon Platinum 8280M socket: LGA 3647
The Intel Xeon Platinum 8280M uses the LGA 3647 socket on C620 series server boards. It matches the 8280 with medium memory support to 2 TB for in memory databases.
- Socket
- LGA 3647
- Launched
- April 2, 2019
- Cores and threads
- 28 and 56
- Base power
- 205 W
- Codename
- Cascade Lake-SP
- Segment
- Server
- Family
- Intel Xeon Platinum
- Clocks
- 2.7 / 4.0 GHz
Intel Xeon Platinum 8280M specifications
| Cores | 28 |
|---|---|
| Threads | 56 |
| Core architecture | Cascade Lake-SP |
| Clocks | 2.7 GHz base, up to 4.0 GHz boost |
| Cache | 38.5 MB L3 (shared) |
| Processor base power (TDP) | 205 W |
| Manufacturing process | 14 nm |
| Memory support | DDR4-2933, six channels, up to 2 TB |
| PCI Express | PCIe 3.0, 48 lanes from the CPU |
| UPI links | 3 links at 10.4 GT/s |
| Integrated graphics | None |
| Multiplier | Locked |
| ECC memory | Yes |
| Package | FCLGA3647 (76.0 by 56.5 mm) |
| Launch price | $13,012 (launch list) |
Motherboard and chipset compatibility
Intel Xeon Platinum 8280M needs a motherboard with a LGA 3647 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| C620 series | C621 | Works out of the box |
Board makers publish a CPU support list for every model. Check it for your exact board before buying. Chipset details for LGA 3647.
LGA 3647 at a glance
| Type | LGA, 3,647 contacts |
|---|---|
| Package size | 76.0 × 56.5 mm |
| Introduced | 2016 |
| Memory | DDR4-2933 ECC, six channels, up to 2 TB |
| Cooler mounting holes | Board specific (narrow and square ILM heatsinks) |
What the Xeon Platinum 8280M is
The Xeon Platinum 8280M is a twenty eight core, fifty six thread server processor with a 2.7 GHz base and up to 4.0 GHz boost. It carries 38.5 MB of shared L3 cache and a 205 W TDP on the 14 nm process. Intel launched it on April 2, 2019 beside the standard 8280.
The M suffix marks medium memory support to 2 TB per socket against 1 TB on the standard SKU, for in memory databases that outgrow normal populations. Clocks, cache, TDP and lanes match the 8280 exactly. The multiplier is locked.
There is no integrated graphics. ECC memory is supported. Launch lists agree near $13,012 with no current ARK page, since Intel retired the SKU page.
Socket and motherboard compatibility
The 8280M fits LGA 3647 on server boards with the C620 series chipsets. Boards need a BIOS with 2nd Gen Scalable support and the exact SKU on the vendor list. Memory topology matters most here, since 2 TB needs dense DIMMs plus Optane modules.
C620 series boards carry six channel DDR4 and 48 PCIe 3.0 lanes per CPU. Rack chassis need strong front to back airflow with vendor qualified heatsinks. Check the board memory QVL for the exact DIMM mix before ordering terabytes.
The chip ships tray only with no cooler. The Intel Xeon W-3175X shares the socket on workstation boards, while server racks use Scalable parts like this one.
Memory, PCIe and cooling
Memory support is DDR4-2933 in six channels up to 2 TB, with ECC. In memory databases size directly into this SKU instead of scaling out across nodes. Validated dense kits are mandatory at these capacities.
PCI Express arrives as version 3.0 with 48 lanes from the CPU. Three UPI links at 10.4 GT/s connect sockets in multi node racks. Cooling uses vendor 205 W server heatsinks with directed chassis airflow.
Upgrade paths
On the same socket the standard Xeon Platinum 8280 matches this chip everywhere except memory ceiling, keeping board and DDR4. Racks pick the M where 2 TB removes a node, and the standard SKU where 1 TB covers the hosts.
Moving past LGA 3647 means a new board on a current server platform. Memory heavy owners usually add DIMMs before replacing processors.
Frequently asked questions
What socket does the Xeon Platinum 8280M use?
It uses LGA 3647 on C620 series server boards with a BIOS that lists 2nd Gen Xeon Scalable parts.
How many cores does the 8280M have?
Twenty eight cores with Hyper-Threading give fifty six threads at 2.7 GHz base with up to 4.0 GHz boost, at 205 W.
How does the 8280M differ from the 8280?
It supports up to 2 TB of memory against 1 TB on the standard 8280. Clocks, cache and lanes are identical.
What memory does the 8280M support?
DDR4-2933 in six channels up to 2 TB, with ECC. Optane details for the M suffix specifically are unconfirmed, so check the vendor list.
How many PCIe lanes and UPI links does the 8280M have?
48 PCIe 3.0 lanes from the CPU plus 3 UPI links at 10.4 GT/s for multi socket racks.
Sources and verification
Facts last checked against these sources on . Page last edited on .