The Haswell Ultrabook Review: Core i7-4500U Tested
by Anand Lal Shimpi on June 9, 2013 9:00 AM ESTBattery Life
I didn’t get my hands on the Haswell S7 until a few hours after I landed in Taipei. My hotel’s in-room internet was throttled to around 2.5Mbps, which wasn’t enough bandwidth to reliably run our web browsing battery life tests. Luckily, I had my review copy of PCMark 8 on hand with its new built in battery life tests. I asked Jarred to run comparison data on the Ivy Bridge S7.
We had time to perform multiple runs on two of the tests: Home and Creative.
From the PCMark 8 Technical Guide:
The PCMark 8 Home benchmark test includes a set of workloads that reflect common tasks and activities performed by a typical person at home. These workloads generally have low computational requirements making the PCMark 8 Home benchmark suitable for testing the performance of low-cost tablets, notebooks and desktops.
The PCMark 8 Home benchmark test contains the following workloads: Web Browsing, Writing, Casual Gaming, Photo Editing and Video Chat.
The PCMark 8 Creative benchmark test includes a set of workloads that reflect tasks and activities typical of more advanced home computer users. With more demanding requirements than the Home benchmark, the PCMark 8 Creative test is suitable for testing the performance of mid-range computer systems. Your system must have a GPU with full DirectX 11 support in order to run all the workloads in the PCMark 8 Creative benchmark.
The PCMark 8 Creative benchmark test contains the following workloads: Web Browsing, Photo Editing, Batch Photo Editing, Video Editing, Media to Go, Mainstream Gaming and Group Video Chat.
As always, I calibrated both displays to the same brightness (200 nits). In the case of the Haswell based S7, I disabled all additional display power saving options in the Intel driver. Keeping in mind the new S7 has a 33% larger battery, I’m presenting both absolute battery life numbers as well as minutes per Wh for normalized comparisons.
The PCMark 8 Home battery life test is the lighter of the two, and thus has the best chance of showing peak improvement on Haswell. The results are very good:
| PCMark 8 Battery Life | ||||
| PCMark 8 Home | PCMark 8 Home (Normalized) | PCMark 8 Creative | PCMark 8 Creative (Normalized) | |
| Acer Aspire S7-391 (Core i7-3517U) | 2.83 hours | 4.857 mins/Wh | 3.35 hours | 5.743 mins/Wh |
| Acer Aspire S7-392 (Core i7-4500U) | 5.2 hours | 6.783 mins/Wh | 5.12 hours | 6.674 mins/Wh |
| Haswell Advantage | 39.6% | 16.2% | ||
In both benchmarks, Haswell ULT delivers 11 - 14% better performance and substantially longer battery life. Normalized for battery capacity, Haswell ULT offers 16% better battery life in the Creative test and almost 40% better battery life in the Home test. Note that the performance advantage pretty much disappears once we move to the Balanced power profile with the laptop connected to the wall.
| PCMark 8 Performance | ||||
| PCMark 8 Home (Power Saver) | PCMark 8 Home (Balanced) | PCMark 8 Creative (Power Saver) | PCMark 8 Creative (Balanced) | |
| Acer Aspire S7-391 (Core i7-3517U) | 1595 | 2694 | 1391 | 2508 |
| Acer Aspire S7-392 (Core i7-4500U) | 1777 | 2832 | 1583 | 2553 |
| Haswell Advantage | 11.4% | 5.1% | 13.8% | 1.8% |
Update: I made it back to the US, equipped with decent internet speeds, I was able to run our light 2013 web browsing battery life test. The increase in battery life is tremendous:
The new S7 delivers over 2x the battery life of the old model. Normalizing for battery capacity, the improvement due to Haswell is 57.5%. These results track perfectly with what we saw in PCMark 8. Workloads with greater idle time will show the biggest improvement in battery life thanks to Haswell ULT.
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Rogatti - Sunday, June 9, 2013 - link
GPU Intel.........no thanks !!!!!Kaveri ... where is you !!! ... do not let me down !
A5 - Sunday, June 9, 2013 - link
Anything based on Steamroller isn't going to be able to touch these battery life numbers.If you don't care about battery life, you can get much better value for your money outside of the ultrabook form factor.
Samus - Sunday, June 9, 2013 - link
The GPU performance is slowly creeping up to AMD; AMD won't be able to use their GPU as a crutch much longer.Death666Angel - Sunday, June 9, 2013 - link
Just the ridiculously lower price.kyuu - Monday, June 10, 2013 - link
Yeah, because AMD isn't going to be improving their iGPU tech at all...?nunomoreira10 - Monday, June 10, 2013 - link
not really, intel currently uses an abnormal 180mm2 of die area on 22nm (hd5000) for the same perfomance and efficiency of an 80mm2 28nm amd gpu.the are trying to go all out, but their gpu tech basically sucks
smartypnt4 - Monday, June 10, 2013 - link
Where'd you see the analysis of how much space HD5000 takes? I haven't seen anything on that. Maybe I just missed it...180mm2 of die area for Haswell ULT total is what's been reported, and AMD's Trinity 4C at 28nm is 246mm2. The number of transistors in each is basically identical. The difference comes in where Intel and AMD spend transistors. I'd wager that AMD spends more transistors in GPU, and Intel spends more in CPU.
To be frank, I don't see how you can assert that Intel's <90mm2 of graphics on an integrated chip has appreciably lower efficiency than any other mobile part on the market. I could be wrong, but I just don't see it as that far off.
smartypnt4 - Monday, June 10, 2013 - link
Never mind. Found Anand's analysis. There's no way that's correct though. If 1/2 of GT3 takes up 87mm2, then full GT3 takes up 174mm2. Haswell 2C ULT is a 184mm2 die. There's no way the GPU takes up 90% of the chip. Over half, sure. but 90% is ridiculously high. Something in the 75-80% range is the absolute highest I'd expect.Homeles - Sunday, June 9, 2013 - link
A bit disappointed to see the CPU performance largely stand pat compared to Ivy bridge, but it nailed the one major thing that mattered: battery life.GPU performance isn't awfully inspiring either. I suppose that I won't see the performance gains I was hoping for until Broadwell.
Oh well. I suppose Fall IDF isn't too far away.
meacupla - Sunday, June 9, 2013 - link
Well, i7-4500U is clocked 100mhz slower, but haswell IPC is about 10% better, so obviously CPU performance is not going to differ by much.GPU performance for HD5000 is pretty much what was expected from early intel slides. Iris pro is what was touted as performing up to 'more than 2x' performance.