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# Hardware Overview
Karolina consists of 827 computational nodes of which 720 are universal compute nodes (**Cn[001-720]**), 70 are NVIDIA A100 accelerated nodes (**Acn[01-70]**), 1 is a data analytics node (**DAcn1**), and 36 are cloud partitions (**CLn[01-36]**). Each node is a powerful x86-64 computer, equipped with 64/128/768 cores (64-core AMD EPYC™ 7H12 / 32-core AMD EPYC™ 7452 / 24-core Intel Xeon-SC 8268) and at least 256 GB of RAM.
[User access][5] to Karolina is provided by four login nodes **login[1-4]**. The nodes are interlinked through high speed InfiniBand and Ethernet networks.
The Accelerated nodes, Data analytics node, and Cloud nodes are available [upon request][a] from a PI. For more information about accessing the nodes, see also the [Resources Allocation Policy][2] section.
For more technical information, see the [Compute Nodes][1] section.
The parameters are summarized in the following tables:
| **In general** | |
| ------------------------------------------- | ---------------------------------------------- |
| Primary purpose | High Performance Computing |
| Architecture of compute nodes | x86-64 |
| Operating system | Linux |
| **Compute nodes** | |
| Total | 827 |
| Processor cores | 64/128/768 (2x32 cores/2x64 cores/32x24 cores) |
| RAM | min. 256 GB |
| Local disk drive | no |
| Compute network | InfiniBand HDR |
| Universal compute node | 720, Cn[001-720] |
| Accelerated compute nodes | 70, Acn[01-70] |
| Data analytics compute nodes | 1, DAcn1 |
| Cloud compute nodes | 36, CLn[01-36] |
| **In total** | |
| Total theoretical peak performance (Rpeak) | 15.2 PFLOP/s |
| Total amount of RAM | 248 TB |
| Node | Processor | Memory | Accelerator |
| ------------------------ | --------------------------------------- | ------ | ---------------------- |
| Universal compute node | 2 x AMD Zen 2 EPYC™ 7H12, 2.6 GHz | 256 GB | - |
| Accelerated compute node | 2 x AMD Zen 2 EPYC™ 7452, 2.35 GHz | 512 GB | NVIDIA A100 |
| Data analytics node | 32 x Intel Xeon-SC 8268, 2.9 GHz | 24 TB | - |
| Cloud compute node | 2 x AMD Zen 2 EPYC™ 7H12, 2.6 GHz | 256 GB | - |
[1]: compute-nodes.md
[2]: ../general/resources-allocation-policy.md
[3]: network.md
[4]: storage.md
[5]: ../general/shell-and-data-access.md
[6]: visualization.md
[a]: https://support.it4i.cz/rt