The Zenbook Prime Exterior

The all-aluminum Zenbook chassis makes another appearance with the Zenbook Prime. It's the same thickness and weight as its predecessor. The Prime also features the same port configuration. On the 11-inch model you get two USB 3.0 ports (one on each side), a mini VGA out (with bundled dongle), micro HDMI out and shared audio/mic jack. The 13-inch model adds an SD card reader, while the thicker UX32 adds full sized HDMI and a third USB 3.0 port on top of that.

While the outside of the Zenbook hasn't changed at all, it's what's inside that's completely different. Both the UX21 and UX31 now feature 1920 x 1080 IPS panels. I'll get into the debate over the usability of such a high res on such an 11.6 inch display shortly, but at a high level this is just awesome. ASUS is finally putting the type of attention we've been asking for on display technology. The 1080p panel on the UX21 looks amazing and performs extremely well as you'll soon see. I can only assume the UX31's panel is similarly impressive.

What else got updates? The camera (now 720p), keyboard, trackpad, WiFi, USB 3.0 and power adapter, to name a few.

The New Keyboard

The keyboard is all-new on the Zenbook Prime. Although it doesn't look as stylish as what ASUS introduced in the original, the new keyboard is worlds better to type on. It feels almost identical (but not completely) to the MacBook Air keyboard, which in my opinion is a good thing. Finger fatigue is significantly reduced compared to the original Zenbook. ASUS claims 12% increased key travel compared to the predecessor which definitely contributes to a better typing feel.

The new keyboard (left) vs. the old keyboard (right)

The keyboard obviously looks very similar to Apple's chiclet as well and now features a LED backlight. There are three selectable brightness settings for the keyboard backlight (four if you count off), which you control via a keyboard shortcut (fn F3/F4).

A Much Improved Trackpad

The problematic trackpad from the original Zenbook was actually addressed mid-cycle last generation. ASUS switched to an ELAN trackpad that did away with most of the issues I encountered. Users who wanted the new trackpad could call, complain and should've been able to get their unit swapped out although there was never a formal replacement program. The Zenbook Prime uses the same trackpad, although this is my first personal experience with it in a Zenbook.

In short, it's much better than what I originally reviewed. Keeping one finger on the trackpad's left click area while you move the pointer is no longer an issue. The pointer will occasionally refuse to move but it's very rare and ASUS even ships software that lets you tweak the trackpad's sensor to better match how you use it:

Tap to click and actually clicking the trackpad are both non-issues again. Two finger scrolling as well as three finger forward/back gestures all work very well. Overall the experience is pretty good, albeit not quite perfect. It's likely the best ASUS can do without writing its own trackpad driver. At some point it may just come to that however.

An Updated Power Adapter

The 45W power adapter from the Zenbook gets a slight update as well. Remember the charge indicator that never turned off? Fixed. Also the somewhat worrisome power connector has been beefed up, it's a bit thicker and I'm less worried about it snapping off.

The old Zenbook power connector (bottom) vs. the new Zenbook Prime connector (top)

I shouldn't be surprised that ASUS fixed these things but it's just so rare that a company listens to feedback and acts appropriately in such a short period of time. I would still like to see a MagSafe clone and better cable management than a bit of velcro, although navigating around any associated patents there should be fun for ASUS' lawyers.

Vastly Improved WiFi

The original Zenbook featured a 2.4GHz Qualcomm Atheros AR9485 802.11b/g/n WiFi solution. Only supporting a single spatial stream the best sustained speeds I saw were around 5MB/s using 20MHz channels at 2.4GHz. The Zenbook Prime offers a considerable upgrade.

Now inside the machine is Intel's Centrino Advanced-N 6205 controller. The 802.11a/g/n controller adds 5GHz support and link speeds of up to 300Mbps. In practice I saw a doubling of performance under the same conditions as the original Zenbook (80Mbps vs. ~40Mbps).

As a side benefit, since ASUS is using Intel's Centrino WiFi on an Intel platform it also by default supports Intel's Wireless Display (WiDi) technology.

Just like last time, the UX21A comes with a sleeve case, VGA dongle and USB to 10/100 Ethernet adapter.

USB 3.0 on Both Ports

Courtesy of Intel's HM76 chipset found on the Zenbook Prime's motherboard are the notebook's two USB 3.0 ports. The original Zenbook had a single USB 3.0 port and one USB 2.0 port by comparison. USB 3.0 performance is a bit higher than what I measured with the original Zenbook. I had no problems sustaining transfers at above 170MB/s.

VGA and HDMI out are also supported. There's no Thunderbolt or DisplayPort on the Zenbook Prime unfortunately.

Simplified SSDs

The original Zenbook offered one of two SSDs depending on the model you picked up: Sandisk's U100 or ADATA's SandForce SF-2281 based XM11. If you'll remember back to my review of the original Zenbook I expressed concern that ASUS was shipping a known buggy firmware with the ADATA drive, although admittedly I didn't run into any of the SandForce BSOD issues during my review of the system. It looks like those concerns can be put to rest as ASUS has dropped SandForce from the Zenbook Prime. Sandisk's U100 is all that's available now.

As we've alluded to in the past, the U100 isn't the fastest SSD on the block but it should be very well priced for ASUS and obviously faster than a mechanical drive. Read speeds are quite good, but write performance is where the U100 falls short. Do a lot of IO (e.g. install a game or just write sequentially to the drive) and you'll notice IO latencies increase. It's the same issue we ran into early on in the MLC client SSD space, but no where near as bad. The good news is there's no stuttering or other similarly undesirable behavior. The system still functions like it has an SSD, it's just that it could be a lot faster under load. I'm saving a full investigation into U100 performance for final Zenbook Prime hardware.

My hope is that we'll see vendors offer drop in replacements for the drive similar to what we saw OWC do for the MacBook Air. I still haven't gotten a straight answer as to whether or not the ASUS drive is electrically compatible with the MacBook Air SSD, nor have I been brave enough to risk nuking a drive to find out. Update: the two SSDs are physically similar, but not physically compatible. Here's a challenge to all SSD makers out there: build an upgrade kit for the Zenbook.

Introduction The Display in Pictures
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  • haukionkannel - Tuesday, May 22, 2012 - link

    It is very nice to see much better panels in these new laptops! And when you think how much power good display eats it is guite nice to see that powr usage has remained the same! We will get more clarity to this matter when ux32 will be released. It seems to have that normal pitifull low res TN panel like in most old laptops...
    We need more laptops like these! I would not mind to see a little bit bigger case with these panels at a little bit lover price!
  • phoenix_rizzen - Tuesday, May 22, 2012 - link

    The high-end version of the UX32, with the discrete GPU, has the same 1920x1080 IPS panel. But the battery is slightly smaller (48 Whr vs 50 Whr).
  • Conficio - Wednesday, May 23, 2012 - link

    I'd go for the UX32 if there would an option with a good screen that is not combined with a useless (to me) gamers GPU.

    Although I don't understand the pricing $200 buy me just a faster CPU? Really, that has to be a really big jump for that kind of premium

    Then the next $300 buy me a decent display (it's still 16:9 and should be 16:10 for people that actually work on their computers, as opposed to entertainment) and a GPU?

    Why can't we have a reasonable upgrade (<$75) for the display with the lower end CPUs. I'd think the $1,000 price point should actually include the nicer display.
  • B3an - Tuesday, May 22, 2012 - link

    So nice to see a GOOD 1080p IPS display on this. And the rest of the package looks great too, might actually get one of these but would have liked atleast 6GB.
  • tipoo - Tuesday, May 22, 2012 - link

    Does that lift before the shipping date? If so, when? Odd that they would be hush hush about that, maybe they are having thermal issues since apparently IB runs hotter than SB.
  • Evil_Sheep - Tuesday, May 22, 2012 - link

    Oh wow this model is a dream come true. It's been years but has a PC vendor finally got what it takes to go head to head with Apple?
  • Roland00Address - Tuesday, May 22, 2012 - link

    Nobody uses that port, and while it comes with a dongle you could have used mini displayport or thunderbolt and achieve the same vga effect with mini displayport to vga dongle.

    That said this is a beauty of a laptop.
  • fic2 - Tuesday, May 22, 2012 - link

    I don't know, but I would assume they included it for projector systems. I think most of the conference rooms in the building I work in only have vga to the table.
  • fic2 - Tuesday, May 22, 2012 - link

    My fail - didn't read the rest of your post about DP->vga dongle.
  • ananduser - Tuesday, May 22, 2012 - link

    My dear Anand, you're so pretentious with displays in general but when it comes to gaming fluency you go below standard. 20fps is NOT playable and a subpar experience. I'd wish you'd be as pretentious with GPU performance as you are with hardware specs.

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