What does 64-bit computing actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.

Sixty-four-bit computing is here and available to systems builders now. Although recent advances in 32-bit processors have been impressive, the idea of data coursing through 64-bit wide registers ...

No. 64-bit Windows will not run on 32-bit architecture, and, in fact, you can't even install it. That said, you can install and run 32-bit Windows on any hardware, both 32-bit and 64-bit.

Remember the transition from 16-bit to 32-bit operating systems? Larry Seltzer examines the comparative inertia surrounding the 64-bit transition.

In Computer Architecture 101 they tell you that a 32-bit CPU has a 32-bit address space (4GB) and does operations on 32 bits at a time. And a 64-bit CPU has a 64-bit address space (way more than ...

SuSE CEO Richard Seibt says the debut of 64-bit processors from Intel and AMD will break a logjam that has plagued IT server computing--with major implications for the ranks of Penguinistas.

A 64-bit operating system will not work in a 32-bit computer, but a 32-bit operating system will run in a 64-bit computer. See 64-bit computing. THIS DEFINITION IS FOR PERSONAL USE ONLY.

Early adopters face choices and trade-offs, even if 64-bit computing is the (near) future.

Since the introduction of the PowerMac G5, Apple has increased the capabilities of 64-bit computing in their software, but the system kernel and supporting applications have still been 32-bit.

Though 32-bit computing is unlikely to disappear any time soon, AMD is betting on wider availability of software for 64-bit processors. A number of software developers involved in the Athlon64 launch ...

But pure 64-bit operation is not yet practical for most of us. Tens of thousands of commercial 32-bit applications must be recompiled and validated.

The Athlon 64, together with its brethren -- the Athlon FX51 and the Opteron -- is to 32-bit computing what the 386 was to 16-bit computing. Athlon 64 et al run 32-bit software that was written ...