Do the 3090 and 3080 share the same chip? I'd be worried about availability if so. I'm also guessing the use of GDDR6 instead of X is to keep an artificial segmentation for the 3090 or is 6x in such a high demand they can't buy enough?
another £1000 card, part of me really thinks Nvidia is pushing these prices so high so they can push streaming services (their own and all others that are using Nvidia GPU's in their data centres) to generate more revenue in the long run
It's the same chip. It's just been lazered off, dead parts removed and uses more power (the 3080) than it should. Obviously that doesn't mean it uses more power than the 3090, it just means that it was a rejected bin for the 3090. That is usually how they make up their ranges.
If you think these prices are high just wait until they return to TSMC and get a big lead again. Prepare the tissues, 'cause your eyes will water.
As for supply? the dies are in short supply as is the memory. Samsung's failure rate is very high. Whether than can be overcome? IDK. Covid hasn't helped any either.
Some of the problem is down to Nvidia insisting that partners buy a kit from them that includes the die and memory. IIRC they are the only ones being supplied GDDR6X ATM.
There were a couple of interesting articles over the past couple of days too.
https://www.youtube.com/watch?v=JDN8rLjWrTQ&ab_channel=GamersNexus
Basically a couple of partners (who rename nameless, but will be in China I reckon) have come out and stated that if they made cards to Nvidia's MSRP they would go bankrupt. That, or have to cut the quality so much the cards would be awful.
It's a bit of an impasse. Nvidia want their margin, board partners are not going to make any money if they stick to them. So that is why the prices are higher.
This one was interesting too.
https://www.youtube.com/watch?v=ZuimvlNraLM&ab_channel=GamersNexus
EVGA's high end very expensive card uses crap parts. This is an £800+ card, and short cuts and cheap outs were made. I would blame EVGA, but when you consider the video above I would say they didn't have a huge amount of choice.
Nvidia is expecting people to do their bidding whilst making no money, leaving it all for them.