[enkdb01:root] /opt/oracle.SupportTools/onecommandYou could also just check the hosts file (possibly) to see how many cells and compute nodes are in there, and look at something like the CPU/memory totals from the compute node. For CPUs, if /proc/cpuinfo shows 16 CPUs, it's a V2, 24 CPUs, it's an X2, and 32 CPUs, it's an X3. If free -g shows 72GB - it's a V2, 96GB or 144GB - it's an X2, if it shows 128GB or 256GB, it's an X3. IF you show 1TB or 2TB, it's an X2-8 or X3-8. The difference between an X2-8 and an X3-8 is on the storage layer, so you'd have to look there to check.
grep OneCommand /opt/oracle.SupportTools/onecommand/preconf.csv
# OneCommand,124,X2-2 HALF RACK,4,7