3.3 Mix architecture and OS

✅ mix architecture and OS

• x86 is like a small house

• x64 is like a big house

• OS if 32 bits is a small lamp

• OS of 64 bits is a big lamp

• ❓ Can I add a small lamp on a small house?
• I can add 32 bits OS on x86
• ❓ Can I add a small or big lamp on a big house?
• I can add 32 bits OS or 64 bits on x64

✔️ Backwards compatibility

• Fact of having x64(new, big) respecting 32 bits OS(old, small)
• is called Backwards compatibility
• 👀 Playstation 5 is not backwards compatible with playstation 2

❓ When would you have to install a 32 bits OS on a 64 bits architecture?

• bc you want to save money, you do not want to buy a new 64 bits OS
• sometimes, companies have 32 bits licences, and they just use them, as it is compatible

✔️ How to combine

• Obviously, if you can choose, 32 with 32, and 64 with 64 is the best choice

❓ Can I install on a x86 computer a 40GB application?

👉🏻 NO,
- on a x86, you only can install a 32 bit OS
- so the files have to be the same or smaller than 4GB

👉🏻 Maybe you can install partial parts of the application

❓ Can I install on a x86 computer a 4GB application?
👉🏻 Yes.
❓ Can I install on a x86 computer a 4.0001GB application?
👉🏻 NO