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  • ASUS U31SD-AH51 13.3-Inch Thin and Light Laptop (Black)
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ASUS U31SD-AH51 13.3-Inch Thin and Light Laptop (Black)

by Asus

Currently unavailable.
We don't know when or if this item will be back in stock.
  • Intel Core i5 Processor 2.4GHz
  • 640GB 5400RPM Hard Drive
  • 13.3-Inch Screen, NVIDIA GeForce GT 520M
  • Windows 7 Home Premium 64-bit, 8 hours Battery Life
See more product details

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Product Information

Expand all Collapse all Technical Details
Screen Size13.3 inches
Screen Resolution1366 x 768
Max Screen Resolution1366x768 pixels
Processor2.4 GHz Intel Core i5
Memory Speed 1333 MHz
Hard Drive640 GB SATA
Graphics CoprocessorNVIDIA GeForce GT 520M
Chipset BrandNVIDIA
Card DescriptionGeForce GT 520M
Graphics Card Ram Size1000 MB
Wireless Type802.11bgn
Number of USB 2.0 Ports 3
Average Battery Life (in hours) 8 hours
Brand NameAsus
SeriesU31 series
Item model numberU31SD-AH51
Hardware PlatformPC
Operating SystemWindows 7 Home Premium
Item Weight3.7 pounds
Item Dimensions L x W x H12.70 x 9.10 x 0.75 inches
Color Black
Processor BrandIntel
Computer Memory TypeDDR3 SDRAM
Hard Drive Rotational Speed5400 RPM
Audio-out Ports (#)1
Battery Typelithium_ion
Power SourceDC
Voltage19 volts
Additional Information
Best Sellers Rank #22,133 in Computers & Accessories (See top 100)
Shipping Weight7.4 pounds
ShippingCurrently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
Date First AvailableOctober 1, 2011
Warranty & Support Return Policy: You may return any new computer purchased from that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellableRead more condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.

Product Warranty: For warranty information about this product, please click here

Product Description Product Description

Stunningly Light . Powerfully Beautiful

The ultra-stylish compact 13.3-inch U31SD-AH51 notebook delivers impressive multitasking performance and long-lasting battery life for up to 8 hours1 of unplugged freedom. From Web browsing to more intensive tasks like gaming, the U31SD-AH51, powered by the second generation Intel® Core i5-2430M processor and DirectX® 11-compatible NVIDIA® GeForce® GT 520M graphics with 1GB video memory and 4GB of system RAM, and you get a notebook that fields serious power for every application.

Featuring NVIDIA Optimus Technology, the U31SD-AH51 works like a hybrid car delivering performance and battery conservation depending on your task at hand. Under an inch thick and very light but totally durable for everything you want to use it in. That's the wonder of the design that has gone into the U31SD-AH51, a notebook that doesn't sacrifice performance in the name of style and mobility – it gives you all the best of every world.

Stunningly Light . Powerfully Beautiful

Key Features

  • ASUS Super Hybrid Engine for optimal system performance and up to 8 hours of battery life1 (Learn more)
  • 2nd Generation Intel Core i5-2430M processor with Intel Hyper-Threading Technology delivers responsive and efficient multitasking performance (Learn more)
  • NVIDIA GeForce GT 520M graphics card with 1GB DDR3 VRAM and NVIDIA Optimus Technology for smooth HD playback and Direct X 11 causal gaming with smart, battery-saving efficiency (Learn more)
  • Lightweight and less than 1-inch at its thinnest point for effortless grab-and-go portability (Learn more)
  • 640GB hard drive and 4GB of DDR3 system memory for ample storage space and enhanced multitasking
  • HDMI connectivity to easily connect to a compatible HDTV or external display for Full 1080p HD visuals and 8-channel digital surround sound support (Learn more)

  • Learn More

    Balancing Performance and Mobility

    Balancing Performance and Mobility
    View Large
    The newly-redesigned U31SD-AH51 offers the sheer power of the second generation Intel® Core i5-2430M processor in a sleek and light form factor that's fun and easy to carry with stylish portability. You can get more done over a full day of computing with exclusive ASUS Super Hybrid Engine energy optimization.

    With up to 8 hours of unplugged freedom,1 the built-in ASUS Super Hybrid Engine uses both hardware and software to optimize system performance, control fan noise, and ensure long-lasting, charger-free mobility through selectable power profiles. Whether it is maximizing battery life or performance, each profile is enhanced for virtually any user scenario you can imagine—putting you in full control of the notebook. NVIDIA Optimus Technology furthers battery savings by detecting system load and automatically switching between discrete and embedded graphics. It seamlessly gives you power when you need it and energy efficiency for less demanding tasks.

    Visually Powerful, Aesthetically Pleasing

    Visually Powerful, Aesthetically Pleasing
    View Large
    Featuring the NVIDIA GeForce GT 520M graphics card with 1GB DDR3 VRAM, experience eye-catching visual performance while editing photos, watching movies, or playing Direct X 11-enabled casual games. The 13.3-inch LED-backlit HD display delivers vibrant clarity with a native resolution of 1366x768 and a 16:9 viewing ratio.

    The U31SD-AH51 award-winning chiclet keyboard allows for a comfortable typing experience and the multi-touch trackpads provides effortless 3-touch navigation. Lightweight and less than 1-inch at its thinnest point, the U31SD-AH51 comfortably fits into carrying cases, making it an ideal choice for a business and school.

    Complete Connectivity

    Complete Connectivity
    View larger
    The U31SD-AH51 comes with high-speed wireless N connectivity (@2.4GHz) to let you connect to the thousands of nationwide hotspots. Easily transfer data and connect peripherals with its built-in 3-in-1 card reader (SD, MMD, MS) and three USB 2.0 ports. HDMI ready, supersize your entertainment to any compatible HDTV or external display with Full 1080p HD playback and 8-channel surround sound support.

    Relax, ASUS Has You Covered

    Ranked as the #1 most reliable PC brand by 3 independent sources,2 readers and editors alike choose ASUS as their trusted notebook and netbook. ASUS tirelessly strives to exceed expectations of quality to ensure you an unmatched peace of mind every time you start your PC.

    This notebook also comes with the industry's most comprehensive warranty.

    1 Year ASUS Global Warranty2

    Offers a level of coverage that would add hundreds of dollars to the price of competing laptops:

  • 1 year global warranty
  • 30 day Flawless Display Guarantee
  • 2-way free standard shipping
  • 24/7 tech support

  • 1 Year Accidental Damage Protection (ADP)2

    Accidents happen. But when they happen to your ASUS notebook purchased in the US or Canada, you have extra protection. Whether your notebook is damaged by accidental spills, drops, electrical surges, or fire, ASUS will fix it or replace it during the first year after purchase.3

  • Target 3 business day turnaround time for repair / replacement; not including receiving and shipping time
  • 1-way shipping (from ASUS to the user) at no additional cost
  • 24-hour toll-free phone support

  • What's in the Box

  • U31SD-AH51 Notebook
  • AC Adapter
  • 8-cell Battery Pack
  • Warranty Information Card


  • Operating System: Windows 7 Home Premium (64-bit)
  • Display: 13.3-inch LED-backlit HD display (1366 x 768)
  • Processor: 2nd generation Intel Core i5-2430M processor (2.2GHz)
  • Graphics: NVIDIA GeForce GT 520M 1GB GDDR3 VRAM
  • WLAN: 802.11 b/g/n (@ 2.4GHz)
  • Bluetooth: B.T 3.0
  • LAN: 10/100/1000 Mbps Ethernet
  • Memory: 4GB DDR3 SDRAM, 2 x SODIMM Sockets (up to 8GB)
  • Storage: 640GB 5400RPM hard drive
  • Camera: 0.3 megapixel
  • Speakers: Stereo speakers
  • Microphone: Digital Array Microphone
  • Card Reader: 3-in-1 card reader (MMC/SD/MS)
  • Input / Output: 1 x Mic-in, 1 x Headphone-out, 1 x VGA port/Mini D-Sub 15-pin for external monitor, 1 x RJ45 LAN, 3 x USB 2.0 ports, 1 x HDMI
  • Battery: 8 cell
  • Dimensions: 12.9 x 9.2 x1–inches (W x D x H)
  • Weight: 4lbs (with 8 cell battery)
  • Color: Black

  • Pinning web sites
    Pin web sites with Internet Explorer 9 (view larger).
    home premium

    Windows 7 Home Premium

    The Best Entertainment Experience On Your PC

    Windows 7 Home Premium makes it easy to create a home network and share all of your favorite photos, videos, and music. You can even watch, pause, and rewind TV or record it to watch whenever and wherever you want. For the best entertainment experience, choose a PC with Windows 7.

    Windows 7: Your PC Simplified

    • Improved desktop navigation features like Snap, Peek and Shake, make it easier to manage all of your open windows.
    • Find virtually anything on your PC--from documents to songs to email--just by typing a word or two with Windows Search.
    • Designed to make your PC sleep and resume quicker.
    • Watch, pause, rewind and record TV with Windows Media Center to watch whenever and where ever you want.*

    Get a Faster, Safer Web with a New PC and Internet Explorer 9

    • Helps protect against identity theft and malicious software with SmartScreen Filter.
    • Movies, TV, and videos look better and run more smoothly.

    Create, Connect, and Share with Windows Live

    Windows 7 and Windows Live bring it all together for free. Get the free set of programs that make it simple to create and share amazing photos and movies, organize mail, and stay connected with your closest friends.

    • Get free online storage with Windows Live SkyDrive.
    • Sync files on your PCs automatically with Windows Live Mesh.
    • Share photos during video chats with Windows Live Messenger.**
    • Easily edit photos. Combine the best parts of multiple photos into one perfect photo with Photo Fuse.

    You can download Windows Live for FREE at

    Pinning web sites
    Create, connect, and share (see larger image).


    office    office

    Complete Your PC Experience with Microsoft Office 2010

    • Includes reduced functionality versions of Microsoft Word and Excel with advertising. (Note that PowerPoint or Outlook are not included.)
    • Purchase Office 2010 today and get the most out of your new PC.


    * Additional hardware may be required. Not available in all countries. (See for more information.)
    ** Requires a compatible microphone, speakers or headset, webcam, and broadband connection.

    © 2011 ASUS Computer International. All Rights Reserved. ASUS is a registered trademark of ASUSTeK Computer. All specifications and terms are subject to change without notice. Please check with your supplier for exact offers on selected models. Products may not be available in all markets. Product may not be exactly as shown in photos.

    1 Actual battery life may vary based on product settings, usage patterns and environmental conditions.
    2 Rated number 1 Windows-based PC maker in's Service & Reliability Report 2010. Rated number 1 PC brand according to SquareTrade, the leading direct-to-consumer warranty company (for more information visit ). Rated number 1 reliable PC maker in Q2 2010's RESCUECOM report
    3ASUS reserves the right to exclude certain SKUs; check with your retailer to confirm coverage of specific models. Valid for notebooks purchased in the US and Canada only. Certain retailers do not participate in ADP coverage. For complete details, please visit: and

    Check Out Other Great ASUS Products

    ASUS U30SD-XA1 Thin and Light Laptop

    ASUS Eee Pad Transformer Tablet (16GB)

    ASUS ML248H 24-Inch LED Monitor

    ASUS RT-N56U Wireless N Router (dual-band)

From the Manufacturer

13.3" (1366x768) LED/ i5-2430M Dual Core (2.4GHz)/ 4GB DDR3 RAM/ Nvidia GT520 1GB/640GB 5400/ Windows 7 Home Premium (64bit)/ 802.11BGN/ 0.3 Pixel/ Bluetooth 3.0/3 USB 2.0 Ports/ HDMI Port/ 8 Cell Battery/ 5-in-1 Card Reader/ 1 YR Global Warranty/ 1YR Accidental Damage Protection/ 30 Day Zero Bright Dot/ 2-Way Free Shipping/ 24-7 Tech Support

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Customer Questions & Answers

Customer Reviews

It has great aesthetics and is very quiet.
My 4th Asus laptop and I am continually amazed by the bang for the buck from their machines... and the U31SD is no exception.
I just got this computer a couple of days ago and so far so good.

Most Helpful Customer Reviews

18 of 18 people found the following review helpful By shotgunb on December 16, 2011
Verified Purchase
Got this on lightning deal and with $75 gift card offer (total under $600)... which had a significant impact on my purchase. Had planned on purchasing the U36SD until this deal came up. U36 is a better built machine and has USB 3.0 but otherwise nearly identical. At regular price there is only a $50 difference, but on sale that jumped to nearly $250. Based on this, I took the plunge and went with this machine... and I am very happy I did.

Up front... CONs: Compared to the new ultrabooks, the build quality and design are 'so-so', but at this price point I think it is pretty solid. Definitely no 'head turner' and the body feels solid but 'cheap'. I concur with earlier review that USB ports are 'tight' and, while it looks great, the black aluminum cover definitely attracts fingerprints. Stock hard drive seems a bit slow.

PROs: Battery life... in excess of 8 hrs in real use... amazing. Monitor... 'standard' but viewing angles are extremely good and much better than other laptops I have. CPU/GPU... both awesome at this price, Core i5 is extremely fast and the optimus run NVidia 520 is great for moderate gaming and video. Basically identical 'guts' as much more expensive laptops in a cheaper body. Weight/size, under 1" thick and under 3 lbs... mixed with battery life and it is an awesome 'traveling' laptop. ADW: pain to sign up for (which upsets many folks) but getting a 1 year accidental damage warranty as part of the base price is awesome and a huge plus for going with an Asus machine... drop it on the way to class... get a replacement!

My 4th Asus laptop and I am continually amazed by the bang for the buck from their machines... and the U31SD is no exception. It won't turn heads like the MacBook or ZenBook... but you can buy two of these for the same price as the ultrabook... and it has the same performance with better battery life... save the money and buy yourself an ipad... win-win
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19 of 20 people found the following review helpful By Danny Yu TOP 1000 REVIEWERVINE VOICE on January 19, 2012
Verified Purchase
Length: 2:01 Mins
The attached video is to give you an idea of how the laptop looks and a summary of my thoughts on this laptop. Here's my written review.

The one thing about this laptop that jumps out is how stylish and sleek it is. But it's not all looks. The 2nd gen i5 processor and gt 520m graphics card makes this an all-purpose laptop that let's you not only compute but also play some of today's newest games.

In this review I'll talk about the design and performance of this U31SD-AH51 laptop.


* The laptop's cover is very sleek and stylish. I love flush aluminum finish. However, it does attract quite a bit of fingerprints. It's not a huge problem though.
* Love the wrist rest. It has a smooth aluminum finish. Feels great and looks great with it's dark gray color.
* Touchpad is very sensitive and feels good. It feels smooth, yet at the same time rough. The right and left click is merged into one chrome click button. It's not too loud when clicked.
* The border of the laptop has a glossy finish. Nice touch.
* The edges of the laptop is very sleek. USBs, hdmi, memory card reader (on the right of laptop) are all nicely placed. Note that there is no DVD drive, so that makes it thinner.
* The battery charger has a right angle head and a quality power block and chord.
* Speakers are placed on the bottom edge facing the person.


* The nvidia gt 520m is what stands out to me for this laptop. 1GB of dedicated graphics memory is a huge plus. You can play newest games like Call of Duty: Modern Warfare 3 and
...Read more ›
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15 of 18 people found the following review helpful By Jerry Nazareta on October 26, 2011
Verified Purchase
Originally researched the ASUS u36s; Amazon posted this as a newer version. Could be true but it was advertised to have two 2.0 USB slots and one 3.0. I wanted the 3.0 for speedier transfers since I'll have to use an external blu ray drive. Be aware, the unit has three 2.0's and NO 3.0 USB slots. I may return this laptop.
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5 of 5 people found the following review helpful By A. Dunn on January 27, 2012
Verified Purchase
I had a U35JC-A1 that I loved but I spilled a glass of wine on it (it was totally full--I hadn't even had any yet!) exactly 4 days after my accidental damage warranty ran out. I was sad, but also a little happy that I had an excuse to get a shiny new laptop. My boyfriend is a computer junkie and got hooked on ASUS several years ago. Because he regards them so highly, and because I loved my previous model so much, I decided to go with the same brand again. That, and there really is no better deal out there, spec-wise.

I am a graduate student so I carry my computer around with me all day, every day between class and my lab and my office. For this reason, my shoulders and I highly value small, light computers. Similarly, I don't like having to find an outlet wherever I go, so I wanted something with a long battery life. I play the occasional MMORPG so my computer also has to be able to handle it. I am also a girl, so aesthetics are important.

I'll start with aesthetics: it's really a pretty computer. I like the brushed aluminum case, and the chiclet keyboard with more brushed-metallic-looking touchpad and other details look really nice. It feels more solidly built than my U35 felt, and it's more attractive.

The battery life is phenomenal--I spend 8-9 hours a day on campus and I've never had a problem with my battery dying in that time. If I use it all day, it comes close (maybe to 10% battery), but it hasn't died on me yet! It is also really lightweight to carry--it definitely doesn't feel like I'm lugging a computer around (I used to have a Dell Inspiron and that baby weighed like 6.5 pounds and made every attempt at ripping my shoulders out of their sockets.
Read more ›
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