Yes. its okay to use this . But i believe it will be for 60 days evolution
Here are the maximum limits for your ESXi 5.5.
vSphere 5.5 supports 320 Physical CPUs per ESXi host
ESXi host supports 4 TB of Memory in vSphere 5.5
16 NUMA Nodes per host in vSphere 5.5
4096 Maximum vCPUs per host
Support for 40 GBps Physical Network adapters
62 TB VMDK virtual disk support
Supports 16 GB FibreChannel end-to-end Support
Increased VMFS Heap, 64TB open VMDK per host max
Virtual Machine Hardware Version 10 in vSphere 5.5
Hope it will help you out.