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It is used in RISC ( reduced instruction set computing) based workstations and server in the early 1990s.64-bit CPUs have been used in supercomputers since the 1970s.Here, are important landmarks from the history of 64-bit processors: In 2000 AMD processor and Intel Pentium processors also start using 32-bit processors.The 32-bit processor was the main processor which was widely used all over the world in the early 1990s.
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Here, are important landmarks from the history of 32-bit processors: 32-bit operating systems and applications require 32-bit CPUs while 64-bit OS demands 64-bit CPU.32-bit processors is not an ideal option for stress testing and multi-tasking whereas 64-bit processors are best for performing multi-tasking and stress testing.32-bit processors need a 32-bit operating system whereas 64-bit processors can run either on 32 or 64 64-bit operating systems.32-bit systems limited to 3.2 GB of RAM while 64-bit systems will enable you to store up to 17 Billion GB of RAM.32-bit processors have 4 GB addressable space while 64-bit processors have 16 GB addressable space.
![64 bit vs 32 bit itunes](https://cdn-ak.f.st-hatena.com/images/fotolife/g/greathigh-power/20200126/20200126194444.jpg)