Better operating system than 64 bit?

[bkdroid13]

I want to ask one general question here, We have seen 32 bit and 64 bit Operating System.
Is there any other larger size bit Operating System exist? If yes can you please share the link to download it.?   i  want the best speed operating system.

[Salmon Trout]

For PCs there are 32 or 64 bit CPUs. A 64 bit CPU can run either 64 bit or 32 bit software (including OS). There no 128 or 256 bit CPUs for PC, so no OS with more than 64 bits.