System Requirement for SQL server

Request you to please update if the below server specifications are fine as per the product specified. Im getting multiple recommendation  on solarwinds website.
SnoServer NameFunctionCPURAM
1NMSSolarwinds Primary Poller4 vCPU(S)16384 MB
2MS-SQLSQL Server4 vCPU(S)65536 MB
3NCMNCM4 vCPU(S)16384 MB
4Poller Additional Pollar4 vCPU(S)16384 MB

Also can you please help me to understand why the RAM for SQL server is 4 times greater then the other products(NPM,NCM and Pollar) and what will the minimum RAM requirement for SQL server i can start with.
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