Intel Rapid Start has been implicated in causing systems not to wake up properly from its special hibernation mode; the system will wake up but never light up the display. Therefore it may be advisable to disable it either in its application (of the same name) or in the BIOS, which would also allow you to delete its hibernation partition and reclaim that storage for use on another partition, or on models with the mSATA cache, increase your Smart Response caching allocation. If you wish to re-enable the standard Windows hibernation function, open a Command Prompt window with administrative privileges and enter "powercfg -h on".
Rapid Start delivers its benefit (much faster hibernation entry and exit) on systems equipped with ALL of the following: a spinning hard drive, a 32 GB mSATA cache SSD, and only 8 GB of RAM (NOT 16 -- unless you disable Intel Smart Response, which would be inadvisable.) Systems that only have a spinning hard drive and no mSATA cache SSD cannot use Rapid Start, and systems that only use SSD storage see little to no benefit. The reason is that Rapid Start's purpose is to ensure that when hibernation occurs, the contents of RAM are written to SSD storage (either a full-size SSD drive or the mSATA cache unit) rather than a spinning drive, which is where traditional Windows hibernation would place it if the OS is installed on a spinning drive. As a result, entering and exiting hibernation with Rapid Start on such systems is much faster than normal. However, on a fully SSD system, since even the default Windows hibernation mode would result in RAM being written to an SSD, Rapid Start's performance increase is marginal at best. In that case, the only reason to use it would be if you wish to use Intel Smart Connect (not to be confused with Smart Response) AND require hibernation rather than just sleep.
The reason Rapid Start doesn't work properly on systems with more than 8 GB of RAM is because the 32 GB mSATA cache is configured to support both Intel Smart Response (not Smart Connect) and Rapid Start. However, Smart Response requires at least 18.4 GB of cache to run, and Rapid Start requires a partition equal in size to the amount of installed RAM. Therefore on a system with 16 GB of RAM, there is not sufficient capacity on the 32GB mSATA cache to use both technologies. Since Smart Response delivers a much larger benefit than Rapid Start, it is recommended to disable Rapid Start and use the reclaimed storage to increase the Smart Response cache. Oddly, Dell does ship a version of this system configured with 16 GB of RAM and a 32 GB mSATA cache that has a too-small Rapid Start partition set up, which prevents Rapid Start from working properly.