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Of course, no PC can hold that much physical memory - but the point is, they could. This is the basis of the “4GB memory limit” for 32-bit hardware and software.Ī 64-bit PC can track 2^64 addresses, yielding a theoretical memory ceiling of about 16 exabytes - 16 billion gigabytes. Computers use only two digits (ones and zeros), so a 32-bit program can track 2^32 (2 to the 32nd power) memory addresses - about 4GB. The primary difference between 32-bit applications and their 64-bit counterparts is the size of memory the programs can address. That’s all well and good - and theoretically true - but without software optimized for 64-bit machines, using those more-advanced processors for everyday tasks is like running a Formula One race car on regular gas. Likewise, PC vendors continue to pitch the benefits of 64-bit PCs over their 32-bit brethren. Microsoft likes to boast about the extra performance delivered by the 64-bit versions of Windows. The situation is improving - slowly - but many major PC applications remain 32-bit affairs.

TOP STORY The long wait for 64-bit PC software continuesĮven though 64-bit PCs have been available for seven years, the promise of 64-bit computing has been delayed by a dearth of 64-bit software.

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