ASUS Eee Pad Transformer Prime & NVIDIA Tegra 3 Review
by Anand Lal Shimpi on December 1, 2011 1:00 AM ESTThe Three Power Profiles
There are three power profiles ASUS and NVIDIA have defined on the Prime: Normal, Balanced and Power Saver. Normal allows the CPU to run at up to 1.4GHz with only a single core active, and 1.3GHz otherwise. Balanced is the default setting and it drops maximum CPU clock to 1.2GHz and favors lower clock/voltage targets on the curve compared to Normal mode. Power Saver caps CPU frequency at 1GHz with 1 - 2 cores active, 760MHz with 3 cores active and 620MHz with 4 cores active. It's unclear what the impact is on GPU clocks/performance.
Regardless of power profile, video playback capabilities are untouched - all profiles are able to play 1080p High Profile H.264 content at up to 40Mbps.
The performance impact of these various profiles varies depending on what you're doing. I ran a mixture of CPU and GPU bound tests in all profiles to measure their impact. The results are below:
I reformatted the SunSpider and BrowserMark scores to keep the magnitude of the numbers in line with the rest in the chart, and to make higher numbers = better performance across the board. For the most part you can see that the difference between Normal and Balanced is pretty small. Numerically it works out to be a 5 - 15% gap depending on the benchmark. The latter end of the range is big enough where the performance conscious will want to stay in Normal mode, but it's possible to do without it.
It's interesting to note that the impact on GPU performance isn't that major across the board. It looks like NVIDIA is primarily modulating CPU speed here. The impact on JavaScript rendering performance is huge when you enable the Power Saving mode. In this state the Prime performs like a Tegra 2 based Gingerbread phone.
Power Profiles & Super IPS+ Toggles
Unlike (far too) many of its competitors, ASUS limits its customizations to those that are almost purely functional. ASUS is clearly aware of the fine line between useful improvements and clutter.
The most obvious customization is in the Quick Settings tool:
ASUS' implementation is far busier but it's all extremely useful. You get one tap access to Super IPS+ mode, as well as one tap switching between Power Saving, Balanced and Normal power profiles. I'm pleased to report that toggling any of these modes is pretty much instant, there's hardly any lag between when you tap a button and its impact takes effect. Response time is a particularly important as it directly impacts how frequently the tool is used. In this case I have no issues switching between power profiles because it's pretty much effortless.
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horangl3e - Thursday, December 1, 2011 - link
do you have to post the review as soon as the NDA is lifted? If that is not the case, why not wait a few more days to share the final review? I enjoyed reading what is present right now but was just wondering. Also would you recommend waiting till Win8 tablets if I have no necessity for tablets this very moment?bupkus - Thursday, December 1, 2011 - link
Also would you recommend waiting till Win8 tablets if I have no necessity for tablets this very moment?Sounds like you answered your own question.
MadMan007 - Thursday, December 1, 2011 - link
Yes, they have to post as soon as the NDA is lifted because first reviews = page hits.Anand Lal Shimpi - Thursday, December 1, 2011 - link
It's generally a good idea to have something up when the NDA lifts (plus, if you don't have something up when the NDA lifts manufacturers may think you don't need to be sampled alongside those who do post when the NDA lifts). In the PC space this is rarely an issue since we normally get 7 - 40 days with a product before the NDA lifts. In the mobile space it's a much bigger problem as many reviewers seem to be ok with a 2 - 24 hour testing period (+time for writing). As I mentioned in the article, I fully expect this to change over time (and I'm actively campaigning for it to change), it just doesn't help when ASUS contributes to the problem. To ASUS' credit however, I don't believe this was ultra intentional but it happened nonetheless.The tablet space is one area where you should wait if you can. The segment is evolving too quickly.
Take care,
Anand
euler007 - Thursday, December 1, 2011 - link
You have to give them a pass though, clearly their #1 goal is getting it out to stores before Christmas and they had to compress their entire release schedule, not just the delay between shipping it to reviewers and lifting the NDA.Why not do a first impression and an in-depth review after a few days?
metafor - Thursday, December 1, 2011 - link
That seems to be the better way of it. The problem with mobile launches is that they do occur very hot-off-the-press in terms of final software/hardware release. They occur so often every year and there's such a race to compete that even if you got a sample very early on, it likely would not have had nearly as complete a software stack.Anand Lal Shimpi - Thursday, December 1, 2011 - link
This was our first impression post :-P The replacement Prime arrived this morning and I've been working on it since it showed up :) Expect more in the coming days.Take care,
Anand
aggrobot - Thursday, December 1, 2011 - link
Sadly, they do. The reason for this is to get the page views. Yes, a more thorough review would be great, and it'll come. For now though, they have to keep up with the competition of suffer the lost visits.Anand Lal Shimpi - Thursday, December 1, 2011 - link
I felt like I did as best as we could given the WiFi issues of the test sample, more is coming though...Take care,
Anand
MadAd - Thursday, December 1, 2011 - link
is it only me that hates that ugly black border around virtually every tablet since the iplod?I mean what wrong with having screen to the edge? Somewhere to put your fingers? pfft ill trade that space for working area and hold it at the edge, or if not make it smaller for my pocket