Uhmm, I think that 40 is the limit 
If you see the processor specifications on https://ark.intel.com/content/www/us/en/ark/products/120489/intel-xeon-gold-6148-processor-27-5m-cache-2-40-ghz.html
It is 20 cores so it it's only 40 threads max.
I am not hardware expert so if you believe that your processor can be overclocked or something like that I think that you should search about it on a Hardware forum or something like that.
If you see the processor specifications on https://ark.intel.com/content/www/us/en/ark/products/120489/intel-xeon-gold-6148-processor-27-5m-cache-2-40-ghz.html
It is 20 cores so it it's only 40 threads max.
I am not hardware expert so if you believe that your processor can be overclocked or something like that I think that you should search about it on a Hardware forum or something like that.