Functional Comparison of Technologies
Here, features of the NX technologies will be compared and contrasted.
Generally, NX bit emulation is available only on x86 CPUs. The sections within dealing with emulation are concerned only with x86 CPUs unless otherwise stated.
While it has been proven that some NX bit emulation methods incur an extremely low overhead, it has also been proven that such methods can become inaccurate. On the other hand, other methods may incur an extremely high overhead and be absolutely accurate. No method has been discovered as of yet without a significant trade-off, whether in processing power, accuracy, or virtual memory space.
Read more about this topic: NX Bit
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