yeah that makes me nervous too. potentially ~2000 watts if your cards come up at full power due to whatever. are there any published specs on what the upper power limit per card is for this board?
Not many people will run the cards at the full power if there is electricity to pay. I only run them at around 60-70% to get higher efficiency.
programs used to power limit cards sometimes fail for whatever reason. ive woke up to my cards at 100% a couple times.
i still test my rigs at full power for a day just to stress test them and check temps at power outlets, psu connectors etc. that way no worries about the odd crash and reboot causing overheat problems with cards or melting connectors with all cards at 100% for prolonged periods when im not around.