Hi! If you're on to speed stuff, consider your MoBo and your hard disk and your applications are design for 64 bit processors.
On Nov 27, 2007 5:10 PM, Orlando Andico <[EMAIL PROTECTED]> wrote: > On Nov 27, 2007 4:34 PM, Michael Tinsay <[EMAIL PROTECTED]> wrote: > .. > > A 64-bit processor means that it can fetch memory 64 bits at a time > compared > > to a 32-bit machine which fetches 32 bits at a time. Offhand, fetching > from > > main memory to cache should take less time. > > Yes -- but -- ultimately you are limited by how wide is the bus width > to main memory. Even 32-bit Intel CPU's have a 64-bit bus width to the > main memory. > > Also, working on 64 bits at a time means that a machine word consumes > 8 bytes instead of 4 bytes. So you can only store half the number of > words in the cache. This is why I said the cache is effectively > halved. > > Also, all current FPU's use 80-bit math (IEEE 754 standard). Having > 64-bit integer registers won't do anything to improve floating-point > performance as the floating-point unit is independent of the integer > units. > > Fast floating point with SSE / SSE2 / SSE3 does benefit from wider > registers, because these > > That said, almost all contemporary CPU's except the entry-level ones > are 64-bit capable. Even the entry-level Intel Pentium E2140 (the > cheapest Intel with dual cores @ 3150 pesos) is EM64T capable. To > truly leverage 64-bit, you'd need to buy a ton of RAM, which although > cheap these days (1400 pesos for 1GB) most main boards can't take > >3GB. > > > > > On the math side, It means it can handle 64-bit integer addition or > > subtraction in one step instead of several. Same thing goes for > floating > > point with >32 bit precision. On strings, it can compare 4 bytes at a > time > > instead of just 2. But this only means something depending on what > > application you're going to run. > _________________________________________________ > Philippine Linux Users' Group (PLUG) Mailing List > plug@lists.linux.org.ph (#PLUG @ irc.free.net.ph) > Read the Guidelines: http://linux.org.ph/lists > Searchable Archives: http://archives.free.net.ph > -- linux user# 459081 Key ID # CA53B229
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