best HW setup for backtesting

 

dear all,

 I'm looking for your recommendations on the HW used for backtesting.

should I go with the 8/4/2 cores?  (RAM? recommended SSD?)

how many instances of  Metatrader can I run on each core?

is there a way to use the graphic card for the backtesting calculation?

Cheers,

Shimon