Acer may have gone a wee bit too far by calling the Acer Aspire Timeline Ultra M3-581T, an Ultrabook. The manufacturer, it seems, has been pushing the boundaries of that form factor to the limits.
For a start, the M3-581T comes with a 15.6in 1,366 x 768 display, not something you see on standard Ultrabooks where the 13.3in format is more common. Then there's an Intel Core i3-3277M CPU, a dual-core model that is clocked at 1.4GHz, comes with 3MB cache, based on the Sandy Bridge architecture and has a TDP of 17W. Ultrabooks usually come with an i5 CPU or faster.
Acer also saw it fit to throw in a DVD writer, an odd choice given that it adds to the laptop's weight. No other Ultrabooks on the market has one. The rest of the specification though is fairly standard.
There's an Intel HD Graphics 3000 video solution, 6GB of RAM, 320GB HDD (with an additional 20GB SSD system drive), a card reader, Dolby Home Theater v4, a HD webcam, Wi-Fi, three USB ports, Bluetooth 4.0, Gigabit Ethernet, up to eight hours battery life, Windows 8, a dedicated numeric keypad, 20mm thick and a weight of 2.3Kg (drop the optical drive and it'd be flirting with 2Kg).