What is the maximum temperature an Antminer S3 ASIC can run at without degrading the hardware?
You should keep it between 50 and 60 C or less. My S3+ at stock speed runs between 40 and 50C in over 30C ambient temps. Over 70 C is bad for the hardware. Unless you disable it, the firmware will turn the miner off if either chain temp reaches 80 C.
thats a bit on the high side for stock, mine is at 453Ghz stock as well, one board is at 41c and other is at 35c
Ambient room temp has a big affect. If aircon is on temps are much lower. Anything below 50 C is quite safe. Usually in mid 40s when no aircon is on. Room heats up to 32 C with Antminer running and no aircon on.