After an eternity of delays and teases, Intel’s debut Arc desktop graphics cards are finally launching, with the flagship Arc A770 GPU releasing on October 12 for $329 (or $349 for a model with 16GB of GGDR6 memory instead of 8GB). Turns out that won’t be the only Arc GPU launching that day. The step-down Arc A750 will hit the streets at the same time, Intel revealed today, with a $289 price point intended to bring the pain to Nvidia’s GeForce RTX 3060. The Arc A750 is a wee bit slower than the flagship A770, natch, but Intel claims its new contender still beats down Nvidia’s mainstream champi…