In my BIOS SpeedStep and SpeedShift are both enabled. Is this correct?
Also, in the SATA Operation field, RAID is On. Correct?

What is the actual Dell model number?  I can check the setup as I do support on the Dell users forums.
I see RAID used on many Dell's so that part may be correct.
 
For the XPS 8930,
Speedstep: enabled, the processor clock speed and core voltage are adjusted dynamically based on the processor load.
Speed shift is not listed as a BIOS option in this model.
 

firebird - Yes, it is a Dell XPS 8930. It came ith one 2 Tb HDD, I added a second 2 Tb HDD.

Most of the new models come with and M.2 SSD that the OS is on and the hard drive is for data, recovery, etc. 
Not sure if you need RAID.   I'll have to ask one of the other techs on the Dell forum.
 

I am not that familiar with RAID and, I am not intentionally using it. Mine came with a single, 2 Tb HDD. I added a second, standard 2 Tb HDD (Seagate Barracuda). I thought I had read somewhere that SpeedStep should be disabled for DAW use but, I can't confirm that. If anybody knows, please, let me know.
 

Tweaking Win 10 for Audio Production (BIOS tweaks are at the end):
 
https://www.youtube.com/watch?v=bxtkEyGih2g
 

Here is the info from one of the Dell forum techs.
All the speedshift and speedstep and whatever else will be on by default. Those allow for better power conservation. As for the RAID situation, its normally on because a lot of computer models use Intel's Rapid Storage or Optaine system for faster boot and program access, which requires 'raid'.
 
There is no need to "tweak" Win 10 on a current Win 10 hardware system.  I have NO tweaking and my system is clean.  Resplendence Latency Mon shows no problems.   I've seen reports on this forum and on the gearslutz forum of Win 10 users that did not have to "tweak" their Win 10 systems.
 
 
 
 

fireberd
Here is the info from one of the Dell forum techs.
All the speedshift and speedstep and whatever else will be on by default. Those allow for better power conservation. 

I'd take Dell forum techs' advice with a grain of salt when it comes to audio processing tweaks.
 
Every DAW/audio production site I've ever seen recommends disabling Speedstep, C-States, Turbo-boost and the like. For example, this is from Steinberg's Knowledge Base:
 
"Disable advanced power-saving and dynamic performance options for your CPU. This usually needs to be done in the BIOS or UEFI of your computer and includes Enhanced Intel SpeedStep (EIST), AMD Cool 'n' Quiet, Intel Turbo Boost, and AMD Turbo CORE. 8. Disable C-States in the BIOS/UEFI, if your computer's BIOS/UEFI gives you this option. C-States allow your CPU to sleep when idle, which may interfere with real-time applications such as audio."
 
And this, from Sweetwater Optimization Guide for Win 10 (2018):

Disabling C-State Transition and Turbo Boost (BIOS)

Please note that not all computers have these settings...  If yours does, it is recommended that you disable them if possible. These two settings can cause the processor to change speeds depending on the computer’s activity which can cause errors in your DAW.
 
Bottom line, I'd follow the advice of techs who work in the DAW/audio processing field over general IT operation.

I didn't report a Dell forum tech's (which I am one of "those") advice on tweaking.  I only reported on what the user originally questioned about those 3 parameters.
 
I have NO tweaking on my Win 10.  I have High Performance power plan but I don't consider that tweaking.  I have NO DPC Latency reported issues and have no problems with either Sonar or Studio One 3 operations.
 

fireberd
I have NO tweaking on my Win 10.  I have High Performance power plan but I don't consider that tweaking.  I have NO DPC Latency reported issues and have no problems with either Sonar or Studio One 3 operations.

Fair enough.  Your system didn't need tweaking -- but the internet is filled with reports of users who got rid of their glitches by doing tweak or the other... Probably the reason why these guides exist.