I'd wait for a 5080 Ti with 20-24GB RAM but I thought we'd get a 4080 Ti and 4090 still remains the best GPU available to this day and for the rest of this month. If we do get a 5080 Ti it's gonna be 2026, more expensive at ~£1,200-1,300 and at most it'll have 24GB RAM. It's not gonna beat the 5090.
£1,940 is a lot but at least I won't have to wait around to see what happens. I can buy a 5090 knowing it'll be the best GPU for the next 2 years (That is unless Nvidia put out a 5090 Ti) and will obviously last much longer than that. I won't need to upgrade again until at least the 8090.
Waiting game is kinda iffy in my vision with all the tech innovations going at lightning speed these days, u don't want to buy a GPU to close to a new generation anymore because u fall behind faster. And that's what happens when u wait for the TI versions which makes them less value in my view.
Sitting on a GPU for multiple generations is also what is not a good idea anymore these days. Imagine buying a 3080 ti, a 4080 absolute levels it with framegen a year later. With path tracing pushed forwards in that gen, u need framegen to get stable framerates. a 4080 vs a 3080 u see a massive performance difference because of it and sadly path tracing is off the menu. While if u bought a 3080 at launch, u got a full 2 years with games launching around that tech before a change happens towards newer tech. Imagine having a 3080 and path tracing releases and u can't because u lack a feature, imagine when 5080 launches and sit on a 3080 when the next title makes full use of 4x framegen and pushes visuals forwards, that 3080 will sit at single digits trying to run it.
This is also why i am convinced that sitting for multiple gens with higher end GPU's is a dumb thing to do. A 5080, with 4x framegen absolute levels a 4080 in newer titles, games that are going to take advantage of that with higher settings will come out in the next 2 years as devs are going to use it. so buying a 5080 at launch u get 2 full years of having a gpu that games are made for is a good idea, waiting for a 5080 ti, that's 1 year u lose out of it.
I think the best thing to do is, before nvidia announces there next gpu's, is to sell your current high end gpu. sell that 4080 for 900 bucks ( they go for 900-950 second handed in my country ), add ~300 bucks and have a 5080 and u are ready to go for this gen. Do the same with the next generation when it arrives. 4090's lose there value harder here it seems like u can pick them up now second handed so u return is far worse, but even there u can do it with, just sell it earlier then the announcement and u should be good.