Model  ASUS ZENBOOK™ UX21 (Ultrabook™) ASUS ZENBOOK™ UX31 (Ultrabook™)

CPU  Intel® Core™ i7 2677M ProcessorIntel® Core™ i5 2467M ProcessorIntel® Core™ i3 2367M Processor

Intel® Core™ i7 2677M ProcessorIntel® Core™ i5 2557M Processor

Operating System  Genuine Windows® 7 Professional 64bitGenuine Windows® 7 Home Premium 64 bitGenuine Windows® 7 Home Basic 64 bit

This version contains all product updates (SP1)

Genuine Windows® 7 Professional 64bitGenuine Windows® 7 Home Premium 64 bitGenuine Windows® 7 Home Basic 64 bit

This version contains all product updates (SP1)

Z‐height  3mm at the front; 9mm at the rear  3mm at the front; 9mm at the rear

Main Memory  DDR3 1333MHz 2GB/4GB (on board) DDR3 1333MHz 4GB (on board)

Screen  11.6 (16:9) 13.3 (16:9)

Backlight/  450 nits HD 1366x768 450 nits HD+ 1600X900

Resolution 

Instant on  Always resume in 2 seconds Always resume in 2 seconds

USB charger+  Y Y

I/O t 6 (USB2 0 / USB3 0 / audio jack / DC jack / microHDMI / 7 (USB2 0 / USB3 0 / audio jack / DC jack / microHDMI /I/O port  6 (USB2.0 / USB3.0 / audio jack / DC jack / microHDMI / miniVGA)

7 (USB2.0 / USB3.0 / audio jack / DC jack / microHDMI / miniVGA / SD card reader)

USB3.0  1 Port 1 Port

SSD Generation  SATAIII SSD (64G/128G/256G) SATAIII SSD (128G/256G)

BT  Bluetooth 4.0 Bluetooth 4.0

Battery  35W (5+ hrs) 50W (7+hrs)

Mic  MEMS MIC (Digital MIC) MEMS MIC (Digital MIC)

Keyboard  268 Chiclit KB 286 Chiclit KB

Camera  0.3M 0.3M

Audio  Bang & Olufsen ICEpower® SonicMaster Bang & Olufsen ICEpower® SonicMaster

F i hild PBKAF FBKFJ FDMC 7696

Richtek RT8166B 

Fairchild PBKAF FDMC 0310AS Fairchild PBKAF FBKFJ FDMC 7696 

4GB DDR3 system memory

Intel Core i3/i5/i7 mobile processor 

SATA ADATA XM11 SSD/SanDisk SSD

Intel QS67 PCH

SATA, ADATA XM11 SSD/SanDisk SSD

Texas Instruments BQ24740;

minicard slot; 

AzureWave AW‐NB086 WiFi/BT combo module

Multi‐Cell Synchronous Switch‐mode Battery Charger 

4GB DDR3 system memory

ITE IT8572G embedded controller ITE IT8572G embedded controller

Fresco Logic FL1000‐2Q0; USB 3.0 controller 

Richtek RT8206A 

Manufacturer Device Function

▼Processor

Intel Intel Core i3/i5/i7 processor Processor + Intel HD 3000 graphicsp g p

▼Memory

Elpida Elpida J4216BASE-DJ-F 4GB, onboard DDR3 system memory

▼Chipset

Intel Intel QS67 PCH

▼Radio Frequency

AzureWave AzureWave AW-NB086 Atheros AR9004WB-1NG‧Atheros AR9485 and AR3012‧802 11n WiFi + Bluetooth 4 0‧802.11n WiFi + Bluetooth 4.0

▼EC

ITE IT8572G System power management controller

▼Audio

Realtek ALC269 HD Audio codec

Manufacturer Device Function▼Storage

ADATA/SanDisk XM11 SSD(128GB)/SanDisk(256GB) SandForce SF-2281VB1 SATA SSD controller/ ( ) ( )

▼User Inputs

ELAN 33200V-3600 1139 BW118V1 Touchpad controller

▼Others

FairchildFDMC7696

FDMC0310AS

Fresco Logic FL1000 USB 3.0 host controller

Texas Instruments BQ24740 Multi-Cell Synchronous Switch-mode Battery Chargery y g

Macronix MX25L3206E 32M-BIT CMOS serial flash

RichtekRT8166B

RT8206A High-Efficiency, Main Power Supply Controller for Notebook Computers

Linear Technology 3857