# Different slave nodes in terms of CPU

**URL:** <https://community.openpbs.org/t/different-slave-nodes-in-terms-of-cpu/3061>\
**Category:** Users/Site Administrators\
**Created:** [April 13, 2022, 1:54pm UTC](https://community.openpbs.org/t/different-slave-nodes-in-terms-of-cpu/3061 "2022-04-13T13:54:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![watzinki](https://avatars.discourse-cdn.com/v4/letter/w/f04885/32.png) [@watzinki](https://community.openpbs.org/u/watzinki)\
**Post date:** [April 13, 2022, 1:54pm UTC](https://community.openpbs.org/t/different-slave-nodes-in-terms-of-cpu/3061/1 "2022-04-13T13:54:55Z")

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Hi Everyone,

I have a small cluster with 8 nodes. All the nodes have the same specification in terms of the CPU but the amount of RAM each has. I would like to add to the queue some spare computers as well. However, these computers do not have the same specifications(different CPU brand, # of cores and freq. etc) as that of the nodes. Would appreciate it if anyone inform me if this could be a performance issue for the cluster or it does not matter at all?

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**Author:** ![adarsh](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@adarsh](https://community.openpbs.org/u/adarsh)\
**Post date:** [April 13, 2022, 3:56pm UTC](https://community.openpbs.org/t/different-slave-nodes-in-terms-of-cpu/3061/2 "2022-04-13T15:56:05Z")

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1. For the cluster it does not matter
2. if you are running a MPI job make sure all the nodes are perfromance nodes and not mixed nodes. As the performance is matched to the slowest node.