Or a 6800xtWhat I'd do in your position is set up some alerts and try and buy a 3080FE.
I doubt you will get one of those for £650 though.Or a 6800xt
I think you have an underlying issue you need to problem solve still, not sure why this thread went off the rails and switched to discussing upgrade paths for a system that should perform better than it currently is. Work from the bottom up (grab a cheap SSD if you need to), barebones install, OS, drivers and problem game, test different driver versions, major and minor, check if upgrades for your mobo bios address any specific issues you might be seeing, etc..