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ASUS B400A-XH51 Intel Core i5 4GB DDR3 500GB HDD 14.1" Ultrabook Black - Windows 7 Professional, 3 Year Warranty

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  • Intel Core i5 3317U(1.70GHz)
  • 4GB DDR3 RAM, 500GB HDD
  • 14.1" 1366x768 Display, Intel HD Graphics 4000
  • Windows 7 Professional 64-Bit
  • Carbon Fiber Chassis, 3 Year Warranty

  • Overview
  • Specs
  • Warranty & Returns
  • Reviews



The ASUSPRO B400 Ultrabook makes business more mobile, durable, secure, and productive. Work flexibly anywhere with a weight factor from 1.64kg and a 20mm profile. The B400 offers complete reliability, meeting much higher industry standards then other notebooks in drop tests, hinge cycle tests, and panel pressure testing. It uses a reinforced carbon fiber structure, anti-shock hard drive, and spill-resistant keyboard. Security gets reinforced with Trusted Platform Module (TPM) hardware and fingerprint reading, while powerful 3rd gen Intel Core processors, and Intel Small Business Advantage (Intel SBA) add to efficient manageability.


Designed Professionally

World-Class Award-Winning Design: Slim, Stylish, and All Pro

Starting with people and understanding what users think, feel, and do, is how we design ASUSPRO B400 Series notebooks. The ASUSPRO B400 is an Ultrabook for mobile businesses, offering an ultra-light form factor starting from just 3.4lb (1.64kg). It measures a slim 0.8in. (21mm), with a stylish dark brushed-hairline finish and one-piece construction creating a subtle and completely consistent professional look. Through the use of carbon fiber materials, metal-reinforced corners, and a true-comfort spill-resistant keyboard, the ASUSPRO BU400 easily withstands the rigors of business travel, guaranteeing long-lasting reliability. Since launch, it has secured prestigious global accolades such as an iF Product Design Award, a Japan Good Design Award, and a Taiwan Excellence Award.


Slim and Light with Uncompromising Full Connectivity

The 14in. ASUSPRO B400 starts at only 3.4lbs (1.64kg), making your business more mobile and flexible. It is just 0.8in. (21mm) thick, yet this slim design doesn't mean reduced connectivity. The B400 features full I/O: USB 3.0, VGA, HDMI, audio port, two-in-one card reader, and Kingston lock. All help you work easier and more conveniently everywhere you go.


True-Comfort Keyboard and Precision Touchpad

Businesses place great importance on keyboards, as they are vital for professional communications. ASUS engineers have fine-tuned the BU400's keyboard, providing better click ratios and travel distance. The touchpad has also been optimized, maintaining high precision while offering a bigger touch surface. All give business users superior productivity-enhancing experiences.


Your Business, Reinforced

Business and organizational users demand greater reliability, so ASUSPRO B400 notebooks are strictly quality-tested to much higher industry standards that even exceed the demanding MIL-STD 810G military standard. They prove very durable in drop tests, hinge cycle tests, and panel pressure testing. They also ship with an anti-shock hard drive that includes a triple protection mechanism to ensure data is always safe.


Enhanced Drop Testing
More than double the drop height of standard notebooks

Stronger Hinge Test
Two times higher standards than mainstream notebooks


Enhanced Pressure Testing
Up to 20% higher endurance compared to normal notebooks

Spill-Resistant Keyboard
Occasional beverage accidents are no longer a problem

Durable-Reinforced LCD Carbon Construction

The ASUS B400's LCD cover employs durable reinforced carbon construction that is several times sturdier than conventional plastics. This gives the notebook 20% higher panel pressure resistance compared to standard notebooks, offering better damage protection while remaining light.

Your Business: More Secure and Manageable

Embedded TPM Security Chip: Valuable Data Protected on a Deep Hardware Level

Professionals can rest assured that their valuable data is protected with Trusted Platform Module security hardware integrated on the board to hold computer-generated encryption keys. Its hardware-based design helps repel attacks by hackers looking to capture passwords and keys to sensitive data. TPM allows notebooks to run applications more securely, and makes transactions and communications more trustworthy.

Improved Security with Fingerprint Scanning

Notebooks incorporating fingerprint scanning take data access authorization and protection to a higher level with a personal touch. RF electronic scanner imaging reads fingerprint patterns, using sensors that are less affected by skin surface conditions, including dry, worn, calloused, dirty or oily skin, which may impair the ability of other sensor technologies to accurately detect fingerprints.




Learn more about the ASUS B400A-XH51

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years
  • Read full details
  • Return Policies
    • Return for refund within: 30 days
    • Return for replacement within: 30 days
  • This item is covered by's Standard Return Policy.
Ownership: 1 month to 1 year
Verified Owner
1/ 5
Asus Service is Garbage 2/25/2014 9:32:20 AM

Pros: Laptop works well, once you remove the absurd amount of bloatware.

Cons: At the three month mark, got a blue screen of death message. Had been working fine prior. Just surfing internet when it happened. After getting cut off two separate times and having to plead my case to a supervisor, the only option is to send this in for a three week repair process. Which, for a small business owner, means I will be buying a new laptop today. Bet it won't, and never will again be, an Asus.

Did you find this review helpful?
Manufacturer Response:
Dear Valued Customer,

Thank you for choosing an ASUS product. I apologize if your are experiencing stability issue with the system and getting a blue-screen-of-death. If the laptop was working properly before, please try running System Restore to revert the system to the last known good configuration. If you need further assistance, please email me at and write down service# 3541508 on the subject line.


ASUS Customer Loyalty
Ownership: 1 day to 1 week
Verified Owner
5/ 5
Awesome 12/5/2013 11:02:29 AM

Pros: I'm a systems engineer by trade so I am very picky when it comes to equipment. This laptop is incredibly well made and the specs are very nice. I did not want a laptop with a touch screen and it coming with WIndows 7 Pro was a nice touch. I already upgraded it to 8GB's. Note there is 4GB's built into the board and only one slot. There's an extra PCIe slot for a ssd as well. I ordered a Samsung 840 EVO drive and waiting to get it to put it in. It doesn't come with to much bloatware but I still ended up just reformatting the drive and do a clean install of 7 anyway.

Cons: No back light keyboard and the screws on the back panel strip really easily so be careful.

1 out of 1 people found this review helpful. Did you?
Ownership: 1 day to 1 week
Verified Owner
5/ 5
Excellent build, decent performance, upgradable 11/6/2013 5:40:11 PM

Pros: Excellent build quality
Empty msata mini pci-e slot for SSD
Quick processor
Good touchpad and buttons
Can upgrade RAM from 4 to 12 Gb

Cons: No discrete graphics
Mediocre 5400 rpm hard drive (but there is empty msata slot for ssd)

Overall Review: A 32 GB msata (half sized) SSD is being shipped to me and I will use it to boot CentOS linux.

2 out of 2 people found this review helpful. Did you?
Ownership: 1 week to 1 month
Verified Owner
4/ 5
Good out of the Box, Great Upgraded 10/17/2013 11:21:11 AM

Pros: Good case, well built.
Fast and good for the price without unnecessary features like touch screen.
Upgradable RAM & Hard Drive.
Relatively light-weight for the size.
3 Year Warranty

Cons: Screen is awful. I would have regretted this purchase on this point alone but we use this laptop with a monitor or with a projector - no big loss here. If you don't care about a decent resolution or good brightness, this isn't a factor for you!

Lots of bloatware. As expected, these laptops come with mounds of bloatware, and add minutes to the boot time. Many items are intrusive with popups on start, persistent desktop items, etc.

Overall Review: I had to do a factory wipe due to a bad Windows update (probably my fault, lost power during the update)... and it was pretty easy, but it took a very long time.

Since this information is hard to find, you can perform the following modifications to this by only opening the case (no advanced tools needed):

1 - swap out hard drive. appears to only support 7MM (instead of standard 9.5mm) drives, but theres a lot of cushioning that could possibly be compressed or partly removed.
2 - Add up to 8GB additional SODIMM RAM. You can't remove nor do you have access to the included 4 GB.
3 - Add a mini (half-size) PCI-E mSATA SSD. These are very hard to find at standard retailers, here is an example on NewEgg:

7 out of 7 people found this review helpful. Did you?
Ownership: 1 month to 1 year
Verified Owner
5/ 5
B400A 10/10/2013 9:22:24 AM

Pros: This laptop is everything I needed apart from my gaming tower. It can handle most tasks with ease, even without the i5 and upgraded RAM.

Cons: No SSD (can be installed though). Intel bloatware, which is very common nowadays. Screen isn't the greatest

Overall Review: Overall, great for mobile computing

Did you find this review helpful?
Ownership: 1 week to 1 month
Verified Owner
5/ 5
First 10/3/2013 11:31:18 AM

Pros: Laptop is fantastic, sleek and performs like a beast.

Upgrading RAM and Hard drive is easily accessible

Build quality is superb

Cons: none

Overall Review: 9 Less scews to access RAM than a macbook pro.

1 out of 1 people found this review helpful. Did you?
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