Isambard-AI phase 1 - HPE Cray EX254n, NVIDIA Grace 72C 3.1GHz, NVIDIA GH200 Superchip, Slingshot-11

Site: University of Bristol
Manufacturer: HPE
Cores: 34,272
Processor: NVIDIA Grace 72C 3.1GHz
Interconnect: Slingshot-11
Installation Year: 2024
Performance
Linpack Performance (Rmax) 7.42 PFlop/s
Theoretical Peak (Rpeak) 9.29 PFlop/s
Nmax 1,859,584
Power Consumption
Power: 117.08 kW (Optimized: 82.40 kW)
HPL of optimized run5.67 PFlop/s
Power Measurement Level: 1
Software
Operating System: Linux
Compiler: N/A
Math Library: CUBLAS
MPI: HPE Cray MPI
List Rank System Vendor Total Cores Rmax (PFlop/s) Rpeak (PFlop/s) Power (kW)
11/2025 213 HPE Cray EX254n, NVIDIA Grace 72C 3.1GHz, NVIDIA GH200 Superchip, Slingshot-11 HPE 34,272 7.42 9.29 117.08
06/2025 183 HPE Cray EX254n, NVIDIA Grace 72C 3.1GHz, NVIDIA GH200 Superchip, Slingshot-11 HPE 34,272 7.42 9.29 117.08
11/2024 155 HPE Cray EX254n, NVIDIA Grace 72C 3.1GHz, NVIDIA GH200 Superchip, Slingshot-11 HPE 34,272 7.42 9.29 117.08
06/2024 128 HPE Cray EX254n, NVIDIA Grace 72C 3.1GHz, NVIDIA GH200 Superchip, Slingshot-11 HPE 34,272 7.42 9.29 117.08