![]() Server systems commonly have more generic devices and with simpler and more stable drivers, and therefore hadn't generally surfaced these problems. As a result, the drivers truncated such addresses, resulting in memory corruptions and corruption side effects. ![]() What they found was that many of the systems would crash, hang, or become unbootable because some device drivers, commonly those for video and audio devices that are found typically on clients but not servers, were not programmed to expect physical addresses larger than 4GB. ![]() Windows XP SP2 also enabled Physical Address Extensions (PAE) support by default on hardware that implements no-execute memory because its required for Data Execution Prevention (DEP), but that also enables support for more than 4GB of memory. However, by the time Windows XP SP2 was under development, client systems with more than 4GB were foreseeable, so the Windows team started broadly testing Windows XP on systems with more than 4GB of memory.
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