Impressed with the Temps on these cards, i did remove the High flow Air Bracket from my 2 x 480's and installed them on my 580SC's.
Idle Temps, Card #1 / Card #2
Fan @ 60% - 2 x 480's = 39C / 37C
Fan @ 50% - 2 x 580's = 29C / 32C
580's with no OC (yet) 800 / 2025 - 980X @ 4.13Ghz
First OC attempt:
850 / 2100 - no issues at all running Vantage - max Temp on Card #1 59C
Should be fun seeing just how high I can get em on Stock Voltage ;) Not sure if the Vantage Link will work below or not, but with the first OC P48 246....shouldn't take much tweaking to crack 50K ;)
Result