Kali Linux is supported on amd64 (x86_64/64-Bit) and i386 (x86/32-Bit) platforms. … You should be able to use Kali Linux on newer hardware with UEFI and older systems with BIOS. Our i386 images, by default use a PAE kernel, so you can run them on systems with over 4 GB of RAM.

What is difference between Kali Linux 32bit and 64bit?

The difference is that a 32-bit system can process 32 bits in one cycle, similar a 64-bit system can process 64 bits in one cycle. The major difference is that in a 32-bit system you will be able to use only 2^32 bytes of RAM which is around 4GB. Similarly, for 64-bit systems, you can use up-to 16 Exa-Bytes of RAM.

Is 32gb enough for Kali Linux?

The Kali Linux installation guide says it requires 10 GB. If you install every Kali Linux package, it would take an extra 15 GB. It looks like 25 GB is a reasonable amount for the system, plus a bit for personal files, so you might go for 30 or 40 GB.