Dell XPS 15 Haswell Edition: QHD+ with a Refined Design
by Jarred Walton on March 6, 2014 7:00 AM ESTDell XPS 15: Battery Life
Our final set of tests is for battery life, and here again we have a change or two to make. I did run our 2013 battery tests, but for 2014 I’ve made some changes. First, our “Heavy” test will now use the Windows Video app to play back a 1080p MP4 movie – the use of MKV files basically resulted in lower battery life by a fairly large margin, and MP4 files are readily available. I’m also considering dumping the “Moderate” workload and just sticking with Light and Heavy testing, as well as including approximate gaming battery life. There’s this mentality of “more information is always better”, but by the same token more information and testing means more time and thus less timely reviews. In general, our Medium battery life results have been pretty consistent about falling half way between our Light and Heavy tests, and with the newly modified Heavy test it’s just one extra benchmark with questionable value.
With that said, we continue to test with LCD backlighting set to 200 nits, WiFi is enabled, and earbuds are connected to the headphone jack. For the XPS 15 QHD+ display, 200 nits ended up being at exactly 50% brightness, which makes things easy on us. I do like that Dell has relatively consistent steps between backlight levels of around 35 nits per 10%. Many laptops that I’ve used in the past have been far less granular, sometimes going from 300 nits at 100% to 200 nits at 90% and then 10 nits intervals from there down to 0%.
Thanks in a large part to the 91Wh battery, the XPS 15 is able to place quite far up our battery life charts in terms of raw unplugged time. It’s not quite so awesome when we look at the normalized Min/Wh figures, but while that can be useful information at the end of the day people are going to be using the battery they get with this laptop. We measured nine hours of battery life in our light workload, nearly 6.5 hours in our moderate workload, and around 4.5 hours in our heavy workload.
Interestingly, our new Heavy test using the Video app with a lower bitrate 1080p MP4 results in battery life that’s basically the same as our previous Medium testing – so with Video, playing a fullscreen MP4 while streaming 1MBps and loading Internet pages every ten seconds isn’t really any more taxing than playing back an MP3 while surfing the web. It appears Microsoft's Video app can scale content without incurring a power penalty, whereas when I was using Media Player Classic previously higher resolution displays often did worse (e.g. look at the XPS 15 results above).
Trying to game off the mains is a different matter, however, and even with a relatively large battery the XPS 15 only manages less than two hours while running Skyrim. (If you’re wondering, for testing gaming battery life, we use the Balanced power profile with the GPU set to “Prefer Maximum Performance”. Then we load up our Skyrim save in the town of Whiterun and let the system run until the battery is drained. The camera begins to pan around the character so it’s at least moderately demanding, though other games are certainly more so.)
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Flying Goat - Sunday, March 9, 2014 - link
Calling this a "gaming laptop" may be a bit optimistic... There are much better mobile GPUs, but the 750 is about as good as you're going to see in a thin and light machine.Death666Angel - Saturday, March 8, 2014 - link
Good review, interesting laptop, but not for me (15" is just too large for my use case). I've been using a Samsung tablet with 11.6" 1080p display for the past ~ year and I've been running it at 125% with no problems and I'm no user of moder UI apps. All my note taking, browsing, the occasional gog or steam game have been very fine with that resolution and scaling. :-)Flying Goat - Sunday, March 9, 2014 - link
Looks like a nice laptop. If it weren't for concerns over throttling and the lack of dedicated page up/down keys, I'd probably have bought one after reading the review. I've been waiting for a Haswell update of Asus's 15 inch Zenbook, or something comparable, and this pretty much fits the bill, modulo those two concerns.snuuggles - Sunday, March 9, 2014 - link
I'm still not sure why you wouldn't just get the mbp and bootcamp it. The price difference is minor considering the mbp is simply a better machine, with better support, and gives you a choice between osx and windows.I am frankly stunned that nobody can beat Mac at making a windows machine--and they aren't even -trying-! Wtf is wrong with dell etc?
jphughan - Sunday, March 9, 2014 - link
Did you read the comments earlier about this? Here are SOME issues with Boot Camping a Mac:- Some hardware requires proprietary Apple drivers which hardly ever get updated on the Windows side
- Thunderbolt ports are not hot-pluggable (i.e. if you didn't have the device connected when you booted, it won't be usable until you reboot).
- The discrete GPU runs all the time (because of Apple's proprietary implementation of switable graphics rather than using Optimus), resulting in much worse battery life
- The keyboard layout isn't ideal for a PC (frankly lack of a TRUE "Delete" key in addition to the Backspace key that Apple calls Delete is a dealbreaker for me whether in Windows or Mac OS X, same for not having Home/End/PgUp/PgDn at all, even as functions of other keys)
- Support from Apple for issues you encounter on the Windows side is probably going to be difficult
Teerav13 - Friday, March 21, 2014 - link
From someone that runs bootcamped windows on a retina mbp all day every day. The worst part by far is the battery life. In visual studio and doing casual web browsing I can expect a 2.5-3hr runtime with reasonable screen brightness. No switchable GPU support in windows is a mega bummer.The keyboard layout is annoying (but not a dealbreaker).
I recently ordered the dell because of these two factors. I really hope the coil whine that people are making a splash about is either resolved or a non-issue.
As a side note though, I worry because every review or comparison I have really seen seems to favor the macbook. The only thing they don't really take into account in them is the users OS preference.
Any idea when a refresh would happen on this line of laptops?
cptcolo - Sunday, March 9, 2014 - link
I can't wait for the Lenovo equivalent. 0.7" thick, 4.4lbs, and a 91 wHr battery is impressiveHrel - Monday, March 10, 2014 - link
Looks like the Gigabyte Laptops are still better. P35K and P25K I think are the model numbers? 15" and 14"? Still waiting on the full review of those btw.lucyfek - Monday, March 10, 2014 - link
And this is just another thing that makes it suck - I'm "fighting" surface 2 pro connected to external monitor. You either get good picture on the tab and really crappy on 1920*1200 screen or your eyes will bleed when looking on the tab but external screen will look good. The best I got to was I lowered resolution on the surface (it's small so 720p actually look ok) and the external display goes with small text (and this is fine).Now if MS allowed to manage themes (not just wallpaper) and there was a way to limit the size of window borders (waste of space).
I'm trying hard to stay within environment limitation (no classic shell yet, trying to keep it "corporate") but usability does suck. And for what? - I removed all metro apps anyway.
Jeffrey Bosboom - Monday, March 10, 2014 - link
You can reduce the window border thickness with the BorderWidth and PaddedBorderWidth values in the HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics key in the registry.