Also let me know your experience of actually testing settings out and what your trial and errors showed you! Thanks!
Have ONLY OS,programs, Windows page file, and "media cache", and "cache" files from PPro on the boot drive.
ALL ELSE, ( media, project files, previews,exports, AE " global performance cache" ), goes on the 960 EVO NVMe drive which has WICKED fast performance.
1TB WD drive should only be for backup of important media , project files and archiving....though,1 TB appears to be a little small by today's standards. You are correct that no ACTIVE files for editing be on this drive...it is TOO SLOW !
Overclocking the CPU safely to 4.3 Ghz or over will provide a good performance boost.
Next, using a free program like " MSI Afterburner",or, similar, to over clock the GPU's " memory clock" ONLY can provide another performance boost anywhere that the GPU is active.
If PC sluggish on scrubbing the timeline after these tweaks, then you may need to trans code clips to cineform,or, another " edit friendly" codec like DNxHD. With your machine you should not have this problem at all with any 1080p material and only some 4K which may be loaded with effects,or, that is a difficult codec.
JFPhoton has covered it well. If you want to test your system hardware and setup you can use my Premiere Pro BenchMark (PPBM) and compare to others or post the Output.csv here an I will try to comment.
I can very simply and safely overclock my GTX 1060 to (GPU-Z readings) Memory Clock 2400 MHz. The first tab says 2500 MHz but any CUDA application like Premiere will show an actual 2400 MHz on the sensors tab.
That will be a nice computer. I would add that indeed 1TB for all media, will get maxed out quickly in my experience. My current set up has all WD Black 7200 rpm drives and works fine, 1TB just for audio, 1TB for images and videos which is very weak but I will be replacing it with 6TB WD Black in a new build soon. I offload a lot to my backup drives in the meantime. I use a 2TB for renders and ISO files, 2TB for project files, menus, other odds and ends. My OS and apps are on a WD Velociraptor 300GB. I am building a new computer in the next year as this is all getting rather old. This set up has been good for the last few years but is clearly a dinosaur. However, I can still burn beautiful HD Blu-Ray discs (90 of em' so far) that upscale well to 4k OLED screen. The next build will include a 1TB SSD for OS, apps and a 1TB 960 EVO NVMe drive being discussed here in the same way. I'll keep my legacy drives until they drop. Everything is backed up to a 24 TB QNAP NAS (twice). While sluggish at times I've burned over 130 DVDs as well as the above mention BDRs. Look forward to sharing the build with other PP NLE aficionados as I enter the world of 4K. Cheers