Graphics card street prices are so fluid and mutable that the retail price hardly seems to matter these days. But every once in a while we’ll get some good news that the manufacturer is issuing an official price drop, and that generally means that the GPU itself (and all of its various packaged derivatives) will reliably get more affordable. So it is with AMD’s mid-range Radeon RX 7700 XT, which today drops from $449.99 to $419.99. With an RDNA3-based chip and a roomy 12GB of GDDR6 RAM, the 7700 XT competes with Nvidia’s RTX 4070, beating the $600 card in price, memory, and memory bus. PCWorld…