"Model like this" not sute about ds v4.1 but qwen3.8 flash next is currently running on 10gb 3080 + 64 gb ddr5 ram at respectable 40-70t/s with 1200pp at max context
Iq3xxs fits barely on my 10+64gb, so much that I am agresivelly cashing checkpoints to disk instead of keeping them in memory, moved vision from ram to disk too etc, I am sitting at few gigs left RAM and few hundred MB free on gpu.
There's this video (1) that I found, and my understanding is that flash next can be very efficient wrt ram needed, by using a "dictionary" (or something similar).