Red hat enterprise linux support 4 processor architectures:
AMD64/intel 64 (x86-64)
IBM POWER 7
IBM System z
RAM
Installation type Minimum required RAM
Local media installation (USB, DVD) 512 MiB
NFS network installation 512 MiB
HTTP, HTTPS, or FTP network installation 1 GiB
There is no practical maximum RAM because, theoretically, you could run 64TB of RAM on RHEL 7. But that’s just theory. The maximum RAM supported on RHEL 7 for 64-bit Intel/AMD-based systems is 3TB, and since RHEL 7.1 the limit has been increased to 6TB.