^The 3090Ti has the same amount of VRAM than a 3090, 24GB. The only difference is the higher bandwidth.
And RDNA 3 may be more efficient, but they're supposed to also be quite power hungry. I wouldn't rule out the possibility of needing a 800W or more PSU to run any of the high end cards, either from Nvidia or AMD.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.