It’s really 2 nodes with both 4 & 20A having limited libraries and being used as a sort of pilot program.

They were being worked on in parallel, not sequentially and have been in some sort of development (path finding, process refinement, etc) for probably 5 years at this point.

If you don’t care about overclocking memory, then your best bet is to get a mid to high range board in the $300-400 range. Below are what I feel are solid options:

• Asus Z790 Strix E - $439.00, high end 4-DIMM w/18+1 90A power stages - Best overall BIOS & hardware IMO
• Asus Z790 Strix F - $369.00, midrange 4-DIMM w/16+1 90A power stages. Basically same as above with a slightly nerfed VRM & w/o PCIe5.0
• GIGABYTE Z790 AORUS MASTER - $449.00, high end 4-DIMM w/20+1 105A power stages - Best hardware
• GIGABYTE Z790 AORUS PRO - $389.00, midrange 4-DIMM w/18+1 90A(?) power stages - Solid hardware and the best aesthetics.

Disclaimer I own the Asus Z790 Strix-E and it’s been great. I’ve had absolutely zero issues but if I could go back I would’ve bought the OG Z790 Apex or the Z790 Apex Encore since I’m not a huge fan of 4-DIMM motherboards.