i swapped mine out for quieter operation to 3000rpm noctua fans, ive always used lower rpm noctuas in my pc builds with excellent results, anyway turns out bad idea, operating temps significantly higher than the stockers so I've changed them back. I've considered running the noctuas as pull, but the stock fans blast a fair bit of air through and i'm not sure if itll overspeed the noctuas
temp up to 59C are fine-it makes no difference-i run Noctua push/ultrakaze pull(at molex=full speed), miner was at 58-59C with 28C ambient (higher than most folks)