CES 2015: Asus' Transformer Book Chi is a Windows 2-in-1 as thin as an iPad Air

..when in tablet mode, that is. Still, it's a whole damn computer
Asus Transformer Book T300Chi

The market for laptops that also think they're tablets has suddenly become interesting.

Since Microsoft's Surface Pro 3 came out, and Intel's fanless Core M processor arrived on the scene, we've seen some great Windows 8 converti-tabs, such as Lenovo's watch strap-hinged Yoga Pro 3. Now there's another intriguing device with a personality crisis, and it goes by the name of Asus Transformer Book Chi.

Asus Transformer Book T300Chi
Asus Transformer Book T300Chi

In fact, it's not one device, but three - the 12.5in T300, the 10.1in T100 and the 8.9in T90. All share the DNA of aluminium unibodies with diamond-cut edges and frankly ridiculous skinniness.

The T300 Chi is the main event, packing a choice of 1080p or WQHD IPS screens (2560 x 1440), Intel Core M 5Y71 (1.2GHz) or 5Y10 (0.8GHz) processors, 64/128GB SSDs and 4GB or 8GB RAM. In laptop mode it's 16.5mm thick, which makes it about the same as a MacBook Air (and it's just 7.6mm thick without the dock). Of course it's also touch-sensitive, and its resolution wipes the floor with that of Apple's finest tiny-puter. Claimed battery life is eight hours on a charge, and there's a 2MP camera for video calls.

The Core M is supposedly good for 'everyday computing', so unlike a Surface or a Macbook, you won't be playing 2015's games on the T300 Chi. Still, Half-Life 2 should run just peachy on its Intel HD 5300 GPU.

The 10.1in, 1920x1200 T100Chi is apparently the world's thinnest Windows 8 tablet at just 7.2mm, and it'll keep going for 10 hours straight. Inside is a 1.46GHz Intel Atom Z3775 processor, 1 or 2GB RAM and 32GB or 64GB of storage.

The T90 Chi packs the same processor as the T100, but has disappointingly low-res 1280x800 8.9in screen. However, at 7.5mm it is, according to Asus, the thinnest nine-inch tab you can buy, and it has a rear-facing 5MP camera to complement its 2MP front-facer.

All three devices click together with their keyboard docks magnetically, but the two pieces actually communicate via Bluetooth 4.0, so they work together at a range of up to 20m.

One concern is that the Chis each have just a single USB3.0 port in type-B configuration (that's the tiny one you use for charging). Certainly, they're not as versatile as devices such as Microsoft's Award-winning Surface Pro 3, although given the top-spec T300 Chi clocks in at just US$800, it's not surprising. The T100 starts at US$400, while the T90 costs from just US$300. All will be available this February.

READ MORE: CES 2015 - All the latest stores from the biggest tech and gadget show on Earth