IDK I am an Intel and Nvidia guy..amd just never cut it for me
the 5900X (387.00)is not much faster and cost 100.00 more than the Intel i7-11700K (267.00)
Xray is right i have not tested the 12th gen new intel processors. they changed alot on the core layout...kind of what amd does....i would steer clear or them
you can get a 3080TI evga 12GB g card around 1k (919.00)
that leaves about 600 for mobo, ram, ssd drive and a decent 750W power supply...you could get away with a 600 but WHY LOL
assuming you can reuse the case that's tight but doable
all the prices I found are from amazon and I currently run the above setup for over a year now on an asus rog strix mobo and have no complaints the I7 keeps on chuggin even after hours of gaming. I run my rig on Air cooling anymore
the power control on todays pc's you don't need overclocking, fancy water coolers and hi heat to get an edge