The slate computing market is about to explode, with a literal flood of new tablets releasing over the coming months. Many of them will be Android based, running Nvidia’s Tegra 2 SoC. Nvidia made a big deal about Tegra 2 back at CES 2010, but for some reason, it’s taken quite a bit of time for anything running the platform to hit the market. Finally, we have one - the Viewsonic G Tablet.

The Tegra 2-based Viewsonic G Tablet showing the Tap UI homescreen

The specs are pretty straightforward; we’ve got a 10” WSVGA display with LED backlighting, Android 2.2 with a specialized UI skin on top, a 16GB microSD card, 2.4GHz 802.11n, Bluetooth 2.1, a 27 Whr lithium ion battery, and the Tegra 2 SoC. The dual-core Cortex A9 is clocked at a nice, round 1 GHz, and there’s 512MB of LPDDR RAM on board. The GPU is Nvidia’s Ultra-Low Power GeForce GPU and there are separate HD video encode and decode blocks also onboard. But the big deal with Tegra 2, as Anand went over in his first look at the SoC, is Cortex A9. The A9 is an out of order architecture with a relatively short pipeline, so it should be significantly faster than the in-order A8 on a per-clock basis.

But before we get to the performance aspect, let’s give the tablet a once over. The Viewsonic is not the most interesting physical specimen, just a screen with a thin bezel around it. From the front, it looks nearly identical to the Galaxy Tab and any number of other tablets on the market. The sides are pretty plain, with volume buttons at the top and a dock connector and mic at the bottom. The left side has a mini USB port, a headphone jack, and a power jack, while there are speakers on either side. The back is filled with logos - Viewsonic, the gTablet logo, the American distributor’s logo, barcode, FCC ID, etc - but otherwise pretty plain. Build quality is actually pretty decent and the tablet has a pretty weighty feel in hand. There’s no flex anywhere, and while the casing doesn’t feel particularly high quality, it’s not low quality by any means. There are some touches in the industrial design that make it seem a bit cheap. The capacitive touch buttons are off-center and easy to press inadvertently, and the physical buttons are placed pretty haphazardly. One thing that really threw me off is the volume rocker, which is switched from the logical layout (volume up is the lower button, volume down is the upper button).

The Viewsonic (left) next to the Samsung Galaxy Tab, both on maximum brightness, to illustrate the viewing angles of both tablets

But for $399 for a Tegra 2 tablet, minor quibbles about build quality and industrial design are about what one should expect. I also expected a not-so-great screen, but not like this. I know that not everyone can splurge like Apple did and go for an IPS screen, but when you look at the TN panels in these and other tablets, it really does make sense. The problem isn’t contrast ratio, the 432:1 figure is actually pretty good for a netbook screen and much better than most small notebooks. It doesn't match the iPad's amazing 934:1 contrast ratio, but still, contrast is not the problem. Unfortunately, the max brightness is not that high at 186nits, which only exacerbates the terrible viewing angles. Something I’ve realized in using tablets - the viewing angles matter a whole lot more than they do in laptops. As is typical with widescreen displays, the horizontal viewing angle is decent, but the vertical viewing angle is pretty bad - anything more than 30 degrees off center and the screen completely washes out. If I try to lay it flat on my desk and use it like my iPad or the Galaxy Tab, it’s basically impossible to see anything on the screen. For a device with a usage model so heavily dependant on good off-center viewing angles, speccing a screen with poor viewing angles was a pretty big oversight.

Viewsonic's Tap UI landscape split keyboard in the revised browser interface

Viewsonic loaded their own Tap UI onto the G Tablet. It’s a decent looking UI, but it’s aggravatingly slow and makes most of the navigation through the OS pretty painful. As with most tablets, there’s no Market preinstalled on the G Tablet (Samsung is the exception here, since they have managed to work around the Android Market restrictions). However, the XDA developers forum is your friend - there’s a simple workaround to get Market and other Google applications enabled, and it’s also possible to disable the UI skin. We’ll go over the software package and hacking aspects of the G Tablet in the full review; for now just know that the preloaded UI is pretty terrible, you'll want to disable it as soon as possible.

The G Tablet (center) next to the Galaxy Tab (left) and T-Mobile G2 (right)

Our first impressions of the G Tablet, beyond the woeful viewing angles and the unfortunate UI skin, is actually that of a fairly usable budget tablet. The user experience is actually pretty decent once you get out of the main UI and into an app or a browser window, and the split keyboard in landscape mode is much better than expected. The tablet has a nice, weighty feel in hand, but if you're using it in landscape mode, it might feel a little heavy for one-handed operation. The touchscreen is responsive enough, though it doesn't feel quite as sensitive as the Galaxy Tab or the iPad. That could just be because of the overall sluggishness of the UI, but we'll see about that after I load the stock Android UI onto the G Tablet. We'll see, but at first brush it looks like the main problems with the Viewsonic are the screen and the UI. We'll have a full review later on with more complete impressions and battery life numbers, but for now, we'll leave you with a preview of Tegra 2 performance.

Viewsonic G Tablet - Tegra 2 Performance
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  • djgandy - Monday, December 13, 2010 - link

    You'll probably find that Quake 3 is CPU limited rather than GPU limited. It's not exactly a GPU intensive benchmark.

    Something more up to date with shaders would have been a better pick to stress the GPU.

    The tablet has a clearly superior CPU and probably has more memory bandwidth amongst other things you can put in the larger form factor.

    Intel have shown actual Quake 3 running at far higher than both these scores on GMA600

    http://arstechnica.com/gadgets/news/2010/05/intel-...
    http://www.anandtech.com/show/3696/intel-unveils-m...
    Reply
  • GnillGnoll - Monday, December 13, 2010 - link

    I don't think Quake 3 is CPU limited, since it's running faster on a Galaxy S which uses the same Chip as the Tab. (As a side note, the chip is called S5PC110, *not* Hummingbird. Hummingbird is the name of the CPU core optimised by Intrinsity which is also used in Apple's A4).

    However, AnandTech really need to explain how they got their results. Running demo four on kwaak3 with default settings I get 46 fps on a new Galaxy Tab.

    Also, Quake 3 is hardly a shining example of modern OpenGL ES code, so I doubt it is indicative of "real-world gaming performance" on an Android tablet any more than Neocore is.
    Reply
  • djgandy - Monday, December 13, 2010 - link

    Well it is more likely memory bandwidth than CPU, however I suspect that the A9 is more efficient with less memory bandwidth too.

    Still I can't understand how the Galaxy Tab performed so poorly on quake, the results don't fit with other performance results for the chip.
    Reply
  • joncat - Tuesday, December 14, 2010 - link

    Does the adreno in the snapdragon even use tile based rendering? As far as I knew, tile based rendering is an exclusive to powervr chips, as in the hummingbird, not a qualcomm technology. Reply
  • therealnickdanger - Tuesday, December 14, 2010 - link

    Literally silly. Reply
  • ganeshpr - Thursday, December 16, 2010 - link

    How do I get to the second page of this article? I get the same page always. Reply
  • djsully - Thursday, January 13, 2011 - link

    Wondering if you think that Viewsonic / Flextronics might add a SIM slot and a second microSD slot to the next version of the Tegra2 powered G Tablet.
    The Qualcomm powered ViewPad7 "little brother" has a SIM slot, and the iPad has a 3G version available, so this seems like a competitive mis-step by Viewsonic. As it's Android based, its a "no brainer" to include a SIM slot.
    T-mobile would like to see it I'm sure ;-)
    Reply
  • Breslavets - Friday, February 4, 2011 - link

    /*
    If I try to lay it flat on my desk and use it like my iPad or the Galaxy Tab, it’s basically impossible to see anything on the screen.
    */
    Galaxy Tab hasn't IPS screen.
    Reply

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