User density and graphics considerations:
- Dell EMC Ready Solutions for VDI validation test results suggest that you can use CPU oversubscription to effectively size VDI user density. To use a CPU configuration other than those that have been validated, consider the following guidance to achieve comparable results for architectures with 3rd Generation AMD EPYC processors:
- Knowledge workers—4.8 users per core. For example, 76 knowledge users with dual eight-core processors
AMD and Intel CPUs are not vMotion compatible within the same VMware vSphere Cluster. If using a mixed CPU vendor environment, ensure that CPUs from the same vendor are in the same cluster. For more information, see VMware EVC and CPU Compatibility FAQ (1005764).
- For graphics configurations, consider the following information:
- For high-end graphics configurations with NVIDIA RTX vWS graphics enabled, consider choosing higher clock speeds over higher core counts. Many applications that benefit from high-end graphics are engineered with single-threaded CPU components. Higher clock speeds benefit users more in these workloads.
- For NVIDIA vPC configurations, consider higher core counts over faster clock speeds to reduce oversubscription.
- Most graphics configurations do not experience high CPU oversubscription because vGPU resources are likely to be the resource constraint in the appliance.
VMware has released and updated its per-CPU licensing model, which requires a license on a per-CPU basis for up to 32 physical cores. Dell Technologies recommends customers who are using vSAN for VDI-only environments to use 'vSAN for Desktop' licensing, which is sold in packs of 10 and 100 licenses and is licensed on a per-VM basis. For those customers who wish to use per-CPU vSphere licensing, please see the Update to VMware’s per-CPU Pricing Model for additional information.