On Fri, 2007-02-02 at 14:57 -0500, Dmitriy Kropivnitskiy wrote: > James Wilkinson wrote: > > It's usually a bit faster. > Just to avoid the confusion, are you saying that 64-bit capable > processors are faster than 32-bit only or that application compiled for > 64-bit architecture is faster then the same application compiled under > 32-bit architecture on the same hardware. The reply to your post tells > me that people think you mean the former, where I was talking about the > latter. I will not dispute the claim that 64-bit CPUs are faster then > 32-bit, cause I don't think they make 32-bit only CPUs anymore (at least > in the x86 architecture). So any 32-bit CPU will be just plain outdated > and therefore slower then any modern 64-bit (and 32-bit capable) CPU. As > for the applications, I believe the difference should be negligible > unless the application is trying to use a lot of RAM. I think I have > seen some benchmarks confirming this, but at the moment I cannot seem to > find them. IIRC 64-bit architectures have more registers. This should make code compiled for a 64-bit processor a little bit faster than code compiled for a 32-bit processor, even if the application doesn't actually make use of quantities larger than 32 bits. I'm not sure how much a difference this actually makes in real world benchmarks, but it's something to think about. -- Evan Klitzke
