Linked by Tony Bourke on Thu 22nd Jan 2004 21:29 UTC
Benchmarks When running tests, installing operating systems, and compiling software for my Ultra 5, I came to the stunning realization that hey, this system is 64-bit, and all of the operating systems I installed on this Ultra 5 (can) run in 64-bit mode.
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RE:when you benefit from 64bit
by JCS on Thu 22nd Jan 2004 22:39 UTC

Strictly speaking, almost all 32-bit processors support at least 64-bit floats - in fact, the P6 and above support 80bit floats internally to reduce rounding erros. What you do see with a "64-bit" system is a 64-bit *integer* (long long) type in hardware. I wouldn't be surprised if OpenSSL made use of that fact.

Apart from tricks like PAE and whatever is in Panther that does the same thing, your memory addressing comment is quite correct. An Opteron running Linux x86-64 is a 64-bit system. A Xeon with 8 GB of RAM - and using it - is not.