Data from F2Pool reveals that most older Bitcoin mining rigs have fallen below their shutdown price due to high network difficulty and electricity costs at $0.06 per kilowatt-hour. Models like Antminer S19, S19j, S19 Pro, S17 series, Avalon A13/A12 series, and Whatsminer M20/M30 series are experiencing negative daily net profits, with shutdown prices ranging from $90,000 to $100,000 or higher. In contrast, newer high-efficiency liquid-cooled models, such as the Antminer S23 Hyd. series, maintain profitability with a shutdown price of about $32,200. The S21 XP Hyd. models also show resilience with shutdown prices between $40,000 and $50,000. Industry experts note that the efficiency gap is widening, accelerating the obsolescence of older models as they struggle to remain profitable.