# Running costs of UM7.3 vs UM10 **URL:** \ **Category:** Unified Model\ **Tags:** access-cm2, access-esm, technical\ **Created:** [9 September 2024 06:26 UTC](https://forum.access-hive.org.au/t/running-costs-of-um7-3-vs-um10/3659 "2024-09-09T06:26:41Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![dkhutch](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/dkhutch/32/510_2.png) [@dkhutch](https://forum.access-hive.org.au/u/dkhutch)\ **Post date:** [9 September 2024 06:26 UTC](https://forum.access-hive.org.au/t/running-costs-of-um7-3-vs-um10/3659/1 "2024-09-09T06:26:41Z")
Hi, After some interesting breakout discussions in the workshop, I was wondering, is there a benchmark comparison of running costs and walltime between UM7.3 and UM10, when both are **run at N96 with the same number of vertical levels**? In comparing ACCESS-ESM1.5 and ACCESS-CM2 I would quite like to know, how much of the extra computational expense of ACCESS-CM2 is due to resolution, and how much is due to moving from UM7 to UM10. Thanks, David ---
**Author:** ![dkhutch](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/dkhutch/32/510_2.png) [@dkhutch](https://forum.access-hive.org.au/u/dkhutch)\ **Post date:** [10 September 2024 06:01 UTC](https://forum.access-hive.org.au/t/running-costs-of-um7-3-vs-um10/3659/2 "2024-09-10T06:01:56Z")
As an alternative to a rigorous formal benchmark, has anyone got a rough estimate from previous simulations of: - SU cost and walltime of running UM7.3 at N96 in atmosphere-only mode? - SU cost and walltime of running UM10 at N96 in atmosphere-only mode? Any sharing of previous experience would be appreciated here. ---
**Author:** ![spencerwong](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/spencerwong/32/1894_2.png) [@spencerwong](https://forum.access-hive.org.au/u/spencerwong)\ **Post date:** [11 September 2024 01:11 UTC](https://forum.access-hive.org.au/t/running-costs-of-um7-3-vs-um10/3659/3 "2024-09-11T01:11:09Z")
Hi @dkhutch, I have some previous runs of the AMIP configuration of ESM1.5 with UM7.3 at N96 resoluton. Using 192 CPUs the resource usage was: - SUs ≈ 435SU per year - Walltime ≈ 1 hour 8 mins per year ---
**Author:** ![dkhutch](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/dkhutch/32/510_2.png) [@dkhutch](https://forum.access-hive.org.au/u/dkhutch)\ **Post date:** [11 September 2024 01:13 UTC](https://forum.access-hive.org.au/t/running-costs-of-um7-3-vs-um10/3659/4 "2024-09-11T01:13:00Z")
Thanks Spencer!