The guide recommends: Disable No-Execute Memory Protect. Is there a good reason to disable this feature? It doesn't seem like it would have an impact on overclocking, and generally it seems like a welcome feature.
The reason to disable all those features is to lighten up the NBs work, and therefore reach higher overclocks obsiously. But if you've reached your desired speed and having No-Execute Memory Protect Enabled doesnt give you any trouble, feel free to enjoy the feature.