What would be the Max worker thread value for 24 processor and 64 bit operating system?

Hi,

In some of my servers Max_Worker_Threads is set to 960

Server configuration :-Total available CPU’s 24 and 64 bit operating system so is this valid? Generally Max_Worker_Thread set to 960 for 32 processors but in my case I have 24 processors.

And on other server

Max_Worker_Thread is set to 255

Server configuration:-Total available CPU’s 8 and 64 bit operating system so is Max_Worker_Thread value is valid? or do I need to change to 576?

Thanks