RAC DB parameters where stored for all nodes

If I have 4 nodes (RACs) where database parameters stored for each instance.?
I know for single instance database all parameters are stored either in V$PARAMETER or V$SPPARAMETER depending on with which file database was started.

The v$spparameter has a column "SID" which reflects the SID for each RAC instance , e.g. :
SQL> select value from v$spparameter where sid='RAC1' and name='thread';
1
SQL> select value from v$spparameter where sid='RAC2' and name='thread';
2
Assuming that the RAC instance names are RAC1 and RAC2

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