220-801 · Question #822
Which of the following operating system types will allow a user to utilize 16GB of RAM if installed on a PC workstation?
The correct answer is D. 64-bit. A 32-bit operating system can address at most 2^32 bytes of memory, which equals 4GB. In practice, usable RAM is typically limited to around 3.2–3.5GB due to memory-mapped I/O reservations. A 64-bit OS can theoretically address up to 2^64 bytes (16 exabytes), making 16GB of RAM…
Question
Which of the following operating system types will allow a user to utilize 16GB of RAM if installed on a PC workstation?
Options
- A8-bit
- B16-bit
- C32-bit
- D64-bit
How the community answered
(50 responses)- A2% (1)
- B2% (1)
- C6% (3)
- D90% (45)
Explanation
A 32-bit operating system can address at most 2^32 bytes of memory, which equals 4GB. In practice, usable RAM is typically limited to around 3.2–3.5GB due to memory-mapped I/O reservations. A 64-bit OS can theoretically address up to 2^64 bytes (16 exabytes), making 16GB of RAM fully accessible. 8-bit and 16-bit operating systems are legacy architectures with far smaller addressable memory limits. Any system needing more than 4GB of RAM must run a 64-bit operating system.
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