DailyTech's got all the details on the full line-up of AM2 boards due out from Gigabyte.

"Gigabyte has five 'tiers' of upcoming AM2 motherboards, each denoted by an 'S.' An 'S5' motherboard is more high-end than an 'S4' motherboard. Each 'S' denotes a different feature, such as SLI, Silent, etc."