I'm sure binning is a factor. They're likely on the edge of the manufacturing process with the 3950X. They probably can get enough to satisfy the demand over time, but demand will exceed the supply for a while.
I didn't realize Amazon was basically allowing people to backorder/pre-order them now. Your comment left me with the impression that the pre-orders at Amazon come and go. It seems like Amazon is continually allowing pre-orders since 12/26 (per nowinstock).I was able secure a pre-order through Amazon for a 3950X tonight. Their ETA won't have it arrive until Jan 18th though. I watch every day and the supply is still very limited at MSRP.
How are you getting notified of the Amazon pre-orders going up? At this point I might sit tight until the 4xxx series. I spent a lot of money in the past month or two on stuff not PC related. I could still get a new system, I not broke but tapping the brakes might not be a bad thing... Also, big FP improvements (up to 50%) in Zen 3 would favor my workloads. It will be interesting to see what AMD demos at CES.I just checked and they still have two. Another Amazon alert said they have more pre-order that will ship in 1-2 days. Mine arrived earlier this morning ahead of schedule.
My understanding is that it will work without it connected based on comments I've seen online, but for $10 extra I'll just get a PS that lets me connect it. I'm not sure if I will do any OC'ing. There doesn't seem to be a lot of headroom in any of these new high-end chips from Intel or AMD. So you end up pushing power consumption quite a bit with very little performance boost.My power supply also doesn't have the 8pin + 4 pin for power but my motherboard doesn't require it so I didn't bother. I don't know if the Aorus Elite Pro also has the option to not connect it if you want to go that route. I'm not a heavy OC'er so I wasn't too concerned.