People who have closely followed used GPU prices on market... your considered forecasts please.

I am after a few 3090 GPU's I dont need them in any big hurry, a few months wait isnt going to kill me.

Now I see that there is the 5070 Ti Super with 24GB potentially on the horizon. How much of an impact do you all think this is going to make on the used 3090 market prices considering historic price actions?

In UK I see 3090s on eBay completed auction listings for around £500-£510. My case being if its only a £0-£20 overall impact on used pricing by ti Super release then its not worth holding out but if it means a £40-£50+ impact then the wait is definitely worth it as I am after 4x 3090s.