MareNostrum 5 ACC
MareNostrum 5 is the EuroHPC pre-exascale supercomputer hosted and run by the Barcelona Supercomputing Center; its accelerated partition serves AI, large language models, climate, drug and vaccine research and engineering.
What it runs and how to get time
From the operator- Used for What the operator says the system is used for: science domains, missions or workloads. Taken from the operator, its funder or the system vendor, not from TOP500.
- AI and large language models, climate simulation, drug and vaccine research, materials science, aviation design, fusion energy, Earth and human digital twins. 3
- How to get time How researchers or customers get time on the system, naming the allocation programme where the operator states one.
- Peer-reviewed calls: 50% via EuroHPC JU Access Calls; the rest split between Spain (via the Spanish Supercomputing Network, RES), Portugal and Turkey. 3
- Cooling Cooling design stated by the operator or supplier.
- Water-cooled. 3
- Power design Facility power, energy supply or heat reuse as stated by the operator. Not the benchmark power in the Power column.
- Fully powered with sustainable energy; its waste heat warms the building that houses it. 3
- Facility Building, data centre or campus that houses the system, as described by the operator.
- Barcelona Supercomputing Center, Barcelona, Spain. 3
- Upgrade or successor Announced upgrade, expansion, successor or retirement plan, with dates where the operator gives them.
- EuroHPC signed a contract on 26 Jan 2026 (FSAS Technologies/Telefonica consortium) to add AI training and inference GPU partitions and storage, installation from early 2026. 5
Benchmark and hardware
Source per value- Rank Position in the TOP500 edition named in the Edition column. Historic systems keep the rank of the edition where they last appeared.
- 16 1
- Rmax PFLOP/s Measured double-precision LINPACK (HPL) performance of the listed configuration. Older TFLOP/s and GFLOP/s figures are converted to PFLOP/s.
- 175.3 1
- Rpeak PFLOP/s Theoretical peak double-precision performance of the listed configuration. This is not AI or mixed-precision throughput.
- 249.44 1
- HPL efficiency % Rmax divided by Rpeak: the share of theoretical peak the system delivered on LINPACK. Computed from the two sourced figures.
- 70.3 1
- Power kW Power reported for the benchmark run. Measurement boundaries vary by site; this is not facility power, TDP or cooling capacity. Empty when the system does not report it.
- 4,159 1
- Efficiency GFLOP/s per W Rmax per watt of reported benchmark power, computed from the two sourced figures (GFLOP/s per W). Empty when power is not reported.
- 42.15 1
- Site Host or operator named by TOP500 for the installation.
- EuroHPC/BSC 1
- Country Country or region reported by TOP500 for the site.
- Spain 1
- Region World region of the installation country (grouping applied by this site).
- Europe 1
- Vendor Manufacturer or system supplier exactly as submitted to TOP500.
- Bull 1
- Vendor group Supplier grouped for filtering. Bull is the Eviden/Atos line; Other covers single-system suppliers.
- Bull 1
- System model Hardware platform in the cited TOP500 edition.
- BullSequana XH3000 1
- Processor CPU description in the cited TOP500 edition; clock and core count refer to the processor model.
- Xeon Platinum 8460Y+ 32C 2.3GHz 1
- Accelerator Accelerator model listed for the system. Empty when TOP500 lists none.
- NVIDIA H100 64GB 1
- Accelerator vendor Maker of the accelerator. None listed means TOP500 names no accelerator for the system.
- NVIDIA 1
- Interconnect Network fabric exactly as listed in the cited TOP500 edition.
- Infiniband NDR 1
- Fabric Interconnect family derived from the listed interconnect (grouping applied by this site).
- InfiniBand 1
- Cores cores Total cores submitted to TOP500, including accelerator cores where TOP500 counts them. Not a CPU-only count and not a CUDA-core count.
- 663,040 1
- Installed Installation year reported in the TOP500 system record. Not necessarily the year of production acceptance.
- 2023 2
- Edition TOP500 edition (YYYY-MM) that supplies the ranking and benchmark data. A historic edition does not assert current operating status.
- 2026-06 1
- OS Operating system from the TOP500 system record.
- RedHat 9.1 2
- TOP500 record Link to the TOP500 database record for this exact submission.
- https://www.top500.org/system/180238/ 2
Sources
- TOP500 list, June 2026 accessed 2026-11-11
- TOP500 system record accessed 2026-11-11
- Inauguration of MareNostrum 5: Europe welcomes a new world-class supercomputer accessed 2026-11-11
- European supercomputer MareNostrum 5 starts up at BSC | EurekAlert! accessed 2026-11-11
- Contract Signed to Boost MareNostrum 5's AI Capabilities accessed 2026-11-11