But note that the baseline performance for the new General Purpose SSD is listed as the size (in GB) times 3 IOPS (so 3K/3072 IOPS for your 1000GB/1TB example).

But note that the baseline performance for the new General Purpose SSD is listed as the size (in GB) times 3 IOPS (so 3K/3072 IOPS for your 1000GB/1TB example). So large volumes will have a baseline that basically matches the listed "burst" IOPS speed, and at less than 1/2 the cost of the PIOPS version.