Dell XPS manual Overclocking

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You can enable or disable Hyper-Threading through system setup. For more information on accessing system setup, see page 109. For more information on Hyper-Threading, search the Knowledge Base on the Dell Support website at support.dell.com.

Overclocking

Dell locks the processor multiplier options in system setup to prevent processor overclocking. The first and most important reason for preventing overclocking is that Dell’s performance labs vigorously test and fine-tune Dell computers at the system level in an attempt to attain the best possible overall performance. Any performance modification that is not implemented in the labs could cause performance degradation. When you receive your computer in the configuration that you ordered, it is already primed for high performance.

The second reason is that an overclocked processor, in general, creates excessive heat and electrical fields that can cause heat fatigue failures within the processor, thus possibly shortening its expected life span. Even slight overclocking can cause a computer to become unstable and lock up.

There are several after-market "performance-modification" products available through various sources, but Dell discourages and does not support the use of those products on its computers.

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Optimizing Performance