I am interested in your selection of drives. My PC is in pre-production and currently has 2x500GB Samsung 980 Pros, a 2TB SSD and a 4TB HDD. My thought was to use one of the 980s for OS and programs and the other as as scratch drive. My photos and catalogue are destined for the SSD and everything else for the HDD. Could I do better? My current ancient machine has 2 slow HDDs, and struggles to run PS. I don’t want to derail the thread, but I thought the discussion might also be useful for the OP.Hi there. I have a build in the pipeline also mainly for Lightroom but on a lower budget than yours. Overall your specs look pretty good to me. Photoshop will like the 8 core CPU but Lightroom won't really see a significant gain past 4 cores. Your RAM is plenty too and will make them both happy. However I might ponder a different drive setup perhaps:
I would consider a bigger 1st M.2 Drive - you would like to have your OS and Lightroom/Photoshop on here so everything can load quickly. 256 GB I don't think will give you much room to spare if you are adding anything else in there. 512GB minimum would be my recommendation.
Lightroom likes having it's Catalogs and Scratch Disk on a separate, fast drive. You could certainly use the SSD for that if you wish. A second M.2 is another option - and is what I went for. Previews and catalog data can then be grabbed quickly when needed. The SSD will work too, but obviously is nowhere near as fast as the M.2 drives. (Bear in mind that on that Motherboard, the first M.2 slot is PCIe 4.0 which is super fast, but the second M.2 slot is PCIe 3.0 via the Chipset which means it works no faster than about 3,500 MB/s - so don't waste money putting any drive faster than the one you already have selected in there.)
With the SDD, just consider how much room you really need. 1TB can fill up quickly if you are using RAW files. It's easy enough to add extra storage later if you need to, but cheaper and easier to do it now with a bigger SSD or even a HDD if you can. For original files or for general use documents and so on, the speed of the drive really isn't as big a deal.
So I personally went for a three drive setup - two M.2 drives and one HDD.
Just food for thought - and there are many more on here more capable of giving better advice - so wait and see what they all say first also!!