Originally Posted by nvidiaftw12
What is this?
That little button is Gigabyte's Extreme Dual BIOS button. Pic below shows the one on the GTX580 SOC.
As opposed to the traditional concept of dual BIOS chips where one is a main BIOS and the other one is a backup BIOS, GIGABYTE Extreme Dual BIOS technology contains two different BIOS chips designed for separate purposes. GIGABYTE Extreme Dual BIOS technology supports one-touch dual BIOS switching button to shift between two BIOSes, SOC (Super Overclock Series) Default BIOS and LN2 BIOS. SOC Default BIOS allows gamers to build their dream machines to conquer digital battles on the web. LN2 BIOS is especially designed for overclockers to avoid potential cold bug issues at extremely low temperatures. This feature equips selective GIGABYTE Super Overclock Series for extreme overclockability to break world records at any competitions.
From those pics, I can see the fans are 40x20mm fans. And such a fan has typical static pressure of 4.5 mmAg at around 6000rpm producing about 28dbA for 9CFM.
For comparison, a Windforce 3x design has three 80x15(or 10?)mm fans. Such a fan has typical static pressure of 2.7mm Ag at around 3000rpm producing about 30dbA for 35CFM.