Measuring in at just over a half-inch thick and just under three pounds, the Acer Aspire S3 ushers in the era of the official, Intel-supported Ultrabook, meant to compete against the likes of the MacBook Air.

The outer shell of the S3 is made of magnesium and inside it's equipped with an Intel Core i5 processor, the $900 S3 has a 13-inch, 1366x768 display, four gigabytes of RAM, and your choice of a 20 gigabyte SSD or and a 320 gigabyte HDD. In addition, the battery is designed to get users through 6 hours without recharging and can wake from a deep sleep in under six seconds.

The Acer Aspire S3 will be available starting this week. [Acer]