Performance is dependent on many factors including deployment specifics, so vCPU/vRAM increases may or may not improve performance. If mixing capacity points in the same UCM cluster then the scale per cluster and the density per node continue to be limited to that of the lowest capacity point (as described in the design guide). All cluster nodes must get the same vCPU/vRAM increase. #Cisco cucm 8.6 ova upgrade
Customers seeking capacity increases should migrate all cluster nodes to a higher fixed capacity point as described in the design guide and upgrade guide.
vCPU/vRAM increases alone do not increase supported capacity, max density per cluster node or max scale per cluster. Customers who wish to add additional vCPU and/or additional vRAM beyond this minimum to improve performance may do so, but note the following: For a given capacity point (such as the 10K user VM), the virtual hardware specs represent the minimum for that capacity point. When deployment on a BE6000S server and version is 11.0 or higher, capacity is limited to 150 users/ 300 devices and design must follow BE6000S requirements in UCM cluster nodes require fixed capacity points with fixed-configuration VMs in the Cisco-provided OVA for UCM. 
* See mouse-over column heading for details UCS or 3rd-party Specs-based on Intel Xeon
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