Comments for parts
1. Yes you can flash any BIOS you want with the Sage since it has the BIOS Flashback button. (Refer to the motherboard manual). A lot of Asus boards have this so you can probably go with another asus board that fits your needs better as the setup process is very similar on them. Since you are going with a Cascade Lake-X cpu, you will have to use BIOS 2002 or higher. . Keep in mind if you get a Cascade Lake-X Refresh board or flash BIOS 3000+ , you'll need to patch the BIOS as I mentioned in my github. Asus broke the MSR lock functionality in the latest round of bios updates. Hopefully they fix it with the next update.
2. Pretty quiet for my needs as it's under my desk. However, I haven't been doing anything super intensive with it yet aside for some benchmark runs. When I run those the fans do get audible but I probably need to adjust my fan curves. I'm running my chip stock at the moment since overclocking requires a lot of cooling. You could probably get away with some minor overclocking with a 360 AIO but I'd highly recommend custom watercooling for anything intensive.
3. Cpu is fine and gives you upgrade path to 10980xe eventually.
4,5,6. Look fine but I don't have any experience with the Sabrent NVME. You could also go with a 3.0 one since X299 doesn't support PCI 4
7. Thunderbolt 3 is optional but I found mine from Amazon.com (i'm in the US)
8. Fenvi-T919 is common since it supports Wifi and BT out of the box. Since the Sage does not have an internal USB 2 header for bluetooth, Here are the options you have to connect it
Hey guys did anyone had any luck with Asus WS C621 and Xeon W-3265? Clover freezes on the PCI Begin part and its been so long since I had that issue that I forgot how to fix it.
www.tonymacx86.com
9. I'd recommend at least getting 1000W for overclocking.
10. Case is fine