Intel Xeon Phi 7290F socket: LGA 3647
The Intel Xeon Phi 7290F uses the LGA 3647 socket on KNL server boards. It is a 72 core Knights Landing part at 1.5 GHz and 260 W with MCDRAM for fabric flagship nodes.
- Socket
- LGA 3647
- Launched
- October 2016
- Cores and threads
- 72 and 288
- Base power
- 260 W
- Codename
- Knights Landing
- Segment
- Server
- Family
- Intel Xeon Phi
- Clocks
- 1.5 / 1.7 GHz
Intel Xeon Phi 7290F specifications
| Cores | 72 |
|---|---|
| Threads | 288 (4 per core) |
| Core architecture | Knights Landing cores on 14 nm |
| Clocks | 1.5 GHz base, up to 1.7 GHz |
| Cache | 36 MB L2 (512 KB per core, no L3) |
| Processor base power (TDP) | 260 W |
| Manufacturing process | 14 nm |
| Memory support | DDR4-2400, six channels, up to 384 GB, plus 16 GB MCDRAM |
| PCI Express | PCIe 3.0, up to 36 lanes |
| Integrated graphics | None (server CPU) |
| Multiplier | Locked |
| ECC memory | Supported (DDR4) |
| Package | LGA 3647 (3647 contacts) |
Motherboard compatibility
Intel Xeon Phi 7290F needs a motherboard with a LGA 3647 socket. Chipset by chipset data for this codename is not recorded yet. See the LGA 3647 chipset list and the board maker's CPU support list.
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 Phi 7290F is
The Xeon Phi 7290F brings Knights Landing to LGA 3647 for fabric flagship nodes with stacked memory. It launched in October 2016 with 72 cores at 1.5 GHz base and up to 1.7 GHz boost at 260 W. Intel targets top clusters that need maximum threads with high power budgets.
Thirty six megabytes of L2 with 512 KB per core carry tiles without L3. Four threads per core give 288 threads. The mesh joins tiles, memory and I/O on die.
Sixteen gigabytes of on package MCDRAM deliver over 400 GB/s beside DDR4-2400 pools up to 384 GB. The process is 14 nm. The multiplier is locked. AVX-512 units push peak double precision past 3.4 teraflops.
Buyers choose the board at order time with memory and cooling tier. The 260 W rating needs robust 2U airflow. MCDRAM flat mode suits large arrays that planners tile by hand.
Socket and motherboard compatibility
The Xeon Phi 7290F fits LGA 3647 on KNL server boards with DDR4 slots. Makers list Knights Landing with late 2016 BIOS builds. Early stock may need an update.
Bootable host builds run Linux directly on the chip. The F suffix marks the 260 W variant of the 7290. The Socket vs chipset: what decides whether a CPU works guide covers matching.
Single socket HPC nodes are the deployment. Growth means more LGA 3647 nodes. Power needs metered racks for 260 W per socket.
Memory, PCIe and cooling
DDR4-2400 in six channels up to 384 GB suits flagship jobs. Sixteen gigabytes of MCDRAM lift bandwidth bound loops. Start with full MCDRAM flat tests for large codes.
PCIe 3.0 with up to 36 lanes from the CPU serves HBAs and NICs. Boards split lanes between risers and NVMe. Fabric options cut add in cards.
Cooling follows server practice with vendor heatsinks for 260 W classes. No cooler ships in the box. ECC guards DDR4 memory.
Upgrade paths
On the same socket, the Intel Xeon Phi 7290 shares 72 cores at the same clocks at 245 W for standard racks. The Intel Xeon Phi 7250F gives 68 cores at 230 W for denser aisles. Both share LGA 3647 boards.
No larger Knights Landing chip exists above 72 cores. Growth means more nodes or Xeon Scalable.
Past flagships move to Xeon Scalable platinum. The Phi 7290F covers late 2016 clusters where fabric flagships must deploy.
Frequently asked questions
What socket does the Intel Xeon Phi 7290F use?
It uses LGA 3647 on KNL server boards.
How many cores does the Xeon Phi 7290F have?
Seventy two cores with four threads each give 288 threads. Base is 1.5 GHz with boost to 1.7 GHz.
Which graphics does the Xeon Phi 7290F include?
None. Serial and network manage the node.
What memory does the Xeon Phi 7290F support?
DDR4-2400 up to 384 GB plus 16 GB of on package MCDRAM.
When did the Xeon Phi 7290F launch?
October 2016 with Knights Landing parts.
Sources and verification
Facts last checked against these sources on . Page last edited on .