In https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html-single/virtualization/index#manually-setting-resource-quota-limits-for-virtual-machines

docs state:
Resource limits must be at least 100 MiB larger than resource requests. 

4.18

Always

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> Memory resource limits (`limits.memory`) must be at least 500 MiB or 2% of `memory.guest` larger than `memory.guest`.

Todays doc is quite conservative, specifically for large VMs 100MiB might be too small.