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If you are limited by half height, true, otherwise you should get equivalent performance for less with a b570.
What exactly even IS “SFF” these days?

I’ve always thought of it as being cards only a bit longer than the slot, and “low profile” as being cards with the same length restriction but half height. Looking up some of the old single-fan models I considered SFF or remember being advertised as “ITX”, it looks like they were about 7-8in?

The smallest B570 looks to be 9.5”… and the AIB partner wants $280 for it. Intel “Limited Edition” cooler design is 10.5”.
 
What exactly even IS “SFF” these days?

I’ve always thought of it as being cards only a bit longer than the slot, and “low profile” as being cards with the same length restriction but half height. Looking up some of the old single-fan models I considered SFF or remember being advertised as “ITX”, it looks like they were about 7-8in?

The smallest B570 looks to be 9.5”… and the AIB partner wants $280 for it. Intel “Limited Edition” cooler design is 10.5”.
Depends on your case what is SFF for you. Half height GPU's have always commanded a high premium, but B50 would fit the bill at (Length x Width) of 6.6" x 2.7" and is the first new entry in this space for quite some time(GT 1030, RX 550, RX 6400 are the prior options).

But it is much easier and cheaper to cool a card with a larger footprint(larger cards will be chaper than smaller cards of the same chip). So if you have the space, b570 should be a better buy as it has more Xe Cores (18vs16) as well as higher memory bandwidth. It should also be cheaper (MSRP $220 vs $300). The benefit of the B50 is it will be a solid higher memory card and leagues better than current half height cards available.