Yes, the Cool VL Viewer (un)installer does not touch them at all.
No, not when your graphics card got almost as much VRAM than your have RAM in your system ! Each texture in VRAM got two different copies (un-decoded and decoded) in RAM, and it means you need roughly 1.5 times as much RAM as the texture VRAM setting. Beside, over 3GB of VRAM for textures is an overkill anyway, even at 512m draw distance in main land.
These settings do not affect how much CPU cores (1) are used by the viewer, however the condition you impose is extremely strict, and never truly met since the viewer is very much adamant on using as much threads as it can, threads that will be spread over various cores by your OS, unless you limit the cores for the viewer at the OS level via the "core affinity" feature (2)...
If you want the viewer to be as mono-threaded as possible, you need to set the graphics driver (system-wide) setting for not multi-threading (meaning 30%-50% less fps); this is true for any viewer.
For the Cool VL Viewer, you will also want to set the number of image decode threads (Preferences -> Cool features -> Misc) and GL worker threads (Preferences -> Graphics -> GPU/GL features) to (respectively) 1 and 0, which will degrade your rezzing experience...
If I were you, I'd upgrade my PC with a better CPU (with 12 or 16 (real, not virtual/SMT) cores)...
(1) The "kernel" is the OS "core" (main, central) software component. CPUs have hardware cores (true/genuine cores which may be seen as two virtual CPU cores when the CPU cores have
SMT), not kernels.
(2) From the Windows task manager (advanced/tabbed view), in the "Details" tab, right-click on the CoolVLViewer.exe process and choose "Set affinity" (or whatever is it called in English or your language), and uncheck all but one core (two (even and uneven consecutive ones) if you got SMT cores: e.g. cores 0 & 1). Proceed the same way with your sound software, affecting all other cores to it.
You are looking at a table of available JEDEC/XMP profiles (supply voltage vs RAM speed), not at the
actual voltage in use (which is likely only available from your BIOS screen, not from CPU-Z & Co).