Validators perform all operations on ciphertext, which requires powerful machines. FHE computations benefit from multi-threading, so we recommend using hpc7a instances or equivalent, with at least 48 physical cores.
The gateway can run on a medium machine with 4 cores and 8 GB of RAM, such as a t3.xlarge.
The TKMS needs to carry out heavy cryptographic operations on the ciphertexts. We recommend using at least a c5.4xlarge instance or equivalent, with at least 16 physical cores.