Linked by Thom Holwerda on Mon 22nd Oct 2007 13:48 UTC
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Member since:
2005-07-24
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Then it would be totally unfeasible to implement, because physical memory availability would not be within many orders of magnitude of that requirement. At the rate of exponential increase that we have seen in the last 20 years, which has remained fairly constant, 2^52 bytes of memory, the limit for future versions of X86_64 processors, would cost about 100 million dollars in 5 years time. (Requiring 262,144 16GB memory sticks, which are likely to be the largest available at that time.) Do you have some reason to think that the rate of *geometric* expansion will increase? It hasn't over the last few decades.
Your terabyte sticks of memory would actually be scheduled for about 2023-2027, BTW.
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Precisely. There is no reason in the world to think that memory will be available in large enough quantities to require > 64 bit processors for about 40-60 years.
BTW, I should take this opportunity to correct my previous posts now that I've refreshed my memory on the topic. The physical addressing limit of current AMD 64 bit processors is 2^40 bytes (not 2^48), giving us about 16 years respite. This can be increased to 2^52 (not 2^64), which would give us a total of 40 years.
My statement it not at all like "who needs personal computers". It is more like "whether people need this much memory or not, it is unlikely to be available in such quantities for at least 40-60 years.
My statement is somewhat *more* like "Nobody will ever need more than 640k of ram". But that statement, if it was ever actually made back then, was *demonstrably* short-sighted and wrong at the time. Can you provide actual *evidence* that my statement is demonstrably short-sighted and wrong?
Edited 2007-10-22 21:42