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How Big is 64 Bit?

By kermit88 ·
What is the term for how much space a 64 Bit Processor can address?

11 Bit = 1024K = Kilobyte
21 Bit = 1,048,576 = Megabyte
31 BIt = 1,073,741,824 = Gigabyte
40 Bit = 1,099,511,627,776 = Terrabyte
51 Bit = 1,125,899,906,842,620 = Petabytes
61 Bit = 1,152,921,504,606,850,000 = ??????

Max 64 Bit addressable space = 18,446,744,073,709,600,000

Any Help?

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by sgt_shultz In reply to How Big is 64 Bit?

that's a bigabyte, i think (rdl)

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by TheChas In reply to How Big is 64 Bit?

According to AMD's 64 bit documentation, the platform has been designed to address up to 4 Petabytes.

The present AMD 64 bit desktop CPUs are limited to either 4 or 16GB depending on how you interpret the specifications.

Remember, 64 bits is the width of the data buss, and does not mean that the address buss is the same width.


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by kermit88 In reply to

More informative that the other question, but I was looking for the name of what came after Petabype . (answer - EXABYTE)

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by TheChas In reply to How Big is 64 Bit?

From the definition of SI prefixes at this site:

Your memory field would be 18 Zetta bytes.


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by TheChas In reply to

The NIST page on Scientific Units also refers to 10^21 as Zetta
10^24 as Yotta


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