Njoerd node architecture
Njoerd is operated by Northern Data Group in United Kingdom. This profile covers Ranked system / partition. Specifications are listed below; anything the operator has not published is itemised in the documented-fields list.
Published benchmark (TOP500 · June 2026)
- HPL rank
- #35
- HPL Rmax
- 78.2 PFlop/s
- Theoretical peak Rpeak
- 106.28 PFlop/s
- Ranked core count
- 273,280
Cluster · HPE Cray XD670 · public profile
- Operator / site
- Northern Data Group
- Country
- United Kingdom
- Profile scope
- Ranked system / partition
- Data checked
- 14 September 2026
- Manufacturer
- HPE
- Ranked core count
- 273280
- Theoretical peak (PFlop/s)
- 106.28
- Operating system
- Ubuntu 22.04
- Network topology
- Rail-optimized
HPE Cray XD670 · public profile
Items marked ▧ come from the documented HPE Cray XD670 platform specification.
- System / node model
- HPE Cray XD670
- Compute nodes of this type
- 244
- CPU model
- Xeon Platinum 8462Y+ 32C 2.8GHz
- CPU sockets per node
- 2
- Cores per socket
- 32
- Physical CPU cores
- 64
- Accelerator model
- NVIDIA H100 SXM5 80GB
- Physical accelerators per node
- 8
- Accelerator memory
- 80 GB per accelerator
- Interface speed
- 400 Gb/s (InfiniBand NDR400)
- Interface-to-accelerator topology
- Eight PCIe Gen5 x16 half-height slots for GPUDirect RDMA network adapters
- Form factor
- 5U single-node chassis · 6 Titanium power supplies (N+2)
Scope and uncertainty
Node count, accelerators per node and fabric follow the Northern Data investor release for the London cluster. Host memory and node-local storage are published only for the operator's other sites and are not carried across, so they remain unrecorded here. Node specifications follow the documented HPE Cray XD670 platform (5U single-node chassis, two sockets, eight SXM5 accelerators); operator-specific deviations are not published.
Documented fields: 17 / 29
Every field this catalog checks. Fields listed above have a value; the remainder are shown here. A field marked absent is not publicly available in the sources we could verify, which does not mean the hardware is missing. Fields that cannot apply, such as benchmark results for an unranked system, are excluded from the total.
Cluster — 5 / 7
- ✓Manufacturer
- ✓Ranked core count
- ✓Theoretical peak (PFlop/s)
- ✕Measured power (kW)
- ✕Energy efficiency (GFlop/s per watt)
- ✓Operating system
- ✓Network topology
HPE Cray XD670 · public profile — 12 / 22
- ✓System / node model
- ✓Compute nodes of this type
- ✓CPU model
- ✓CPU sockets per node
- ✓Cores per socket
- ✓Physical CPU cores
- ✕CPU note
- ✓Accelerator model
- ✓Physical accelerators per node
- ✕Host / unified memory
- ✓Accelerator memory
- ✕Accelerator ↔ accelerator link
- ✕On-node fabric
- ✕CPU ↔ accelerator link
- ✕Network interfaces per node
- ✕Interface model
- ✓Interface speed
- ✓Interface-to-accelerator topology
- –Aggregate scale-out per node
- ✕GPUDirect RDMA
- ✕Management / storage networking
- ✕Local storage
- –NVMe data disks
- –Max remote data disks
- –Uncached disk IOPS
- –Uncached disk throughput (MBps)
- ✓Form factor
Sources
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