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PCs that use the Pentium 4 and other chips that do not offer hardware-enforced execution protection (the NX feature), must rely on execution protection built into the operating system. However, this procedure - known as 'sandboxing' -- is not as effective as the hardware implementation in NX-enabled chips.
AMD and Microsoft are currently planning a campaign to promote the value of the NX feature to users.
AMD's Athlon 64 processors offer protection from memory overflow with the NX feature. Windows XP provides support for this feature in Service Pack 2.
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