Confusion

[zhenlilu2003]

I think I have just found an error in the CPU101. In there it says 32bit CPU support 2^32 bits (4GB) of RAM, but my calculation worked out to be 0.5GB?
And the 64bit CPU support 2^64 bits of RAM, but my calculation revealed a much much bigger number than 16GB?! I am noob, so maybe I have misunderstood something? But I checked the math many times! Very confused :-(

 

[Cromewell]

Your calculation is off 1111 1111 1111 1111 1111 1111 1111 1111 = 32 bits. Converting to decimal you get 4 294 967 295, divide by 1024 twice and you get ~4096 = 4GB. 64bit cpus (in theory) support a friggen ton of RAM.

 

[zhenlilu2003]

but the 4096 is in Mb not MB, so it works out to be 4Gb, that is 0.5GB.
8b=1B right?

 

[Cromewell]

It's 4 294 967 295 addresses.

 

[Praetor]

64bit cpus (in theory) support a friggen ton of RAM.

Too bad, for the most part, memory controllers still limit it to 4GB per CPU. (and yeah for the 64bit CPUs its 16TB, not 16GB ... slip of the finger)