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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JDG1980 - Sunday, June 9, 2013 - link
Do Haswell notebook chips have the same crazy high temperatures on full load that the Haswell desktop chips do?dealcorn - Sunday, June 9, 2013 - link
I am not comfortable with your suggestion that DEVSLP's 2 mw benefit shows exclusively/primarily when the system is asleep. I sense a big benefit at low loads because the SSD's can slip in and out of DEVSLP really fact. Let's have some testing, at your leisure. Will a SSD be in DEVSLP state 50% of the time while watching non HD video? I suspect power requirements during DEVSLP is the new idle power measurement for typical home use and SSD reviews should be revised accordingly.Everything else: Bravo!
Sivar - Sunday, June 9, 2013 - link
Typo:"Haswell less than a month after the arrival of a new CEO"
Just trying to help out. :)
kallogan - Sunday, June 9, 2013 - link
What a tech revolution, a bigger battery gives a bigger battery life.FwFred - Sunday, June 9, 2013 - link
Reading is FUNdamental: "Using Acer’s Aspire S7 as a comparison platform and NORMALIZING FOR BATTERY CAPACITY DIFFERENCES I measured anywhere from a 15% to a 60% increase in battery life thanks to the move to Haswell."Emphasis mine.
kallogan - Sunday, June 9, 2013 - link
Scam. A well optimised ivy lap would do the same.Egg - Sunday, June 9, 2013 - link
Proof?Homeles - Monday, June 10, 2013 - link
I see that reading comprehension is not your strong point.kallogan - Monday, June 10, 2013 - link
I just need more than one Haswell based laptop review to draw any conslusions.seapeople - Tuesday, June 11, 2013 - link
Me too. I think Anand should have held any Haswell reviews until we've had a good five years for industry to comprehensively adopt the architecture and fundamentally evaluate the aggregate system stability on an enterprise-wide scale. Then he could submit all the reviews he had saved up.