System Performance

For the new model, Lenovo has taken the step of moving from the 15 watt Haswell-U series processors to the 4.5 watt Broadwell-Y based Core M. Their first run of Yoga 3 Pros came with the Core M-5Y70, which has a base frequency of 1.1 GHz, and a boost of 2.6 GHz. Lenovo has refreshed the Yoga 3 Pro to include the 5Y71 processor, which increases the base clock to 1.2 GHz and boost to 2.9 GHz. It will be interesting to see the performance delta between the Yoga 3 Pro and the Yoga 2 Pro.

The Broadwell-Y processors have two cores and hyperthreading. With a thermal envelope of just 4.5 watts though, boost clocks with heavily multithreaded workloads will be reduced as compared to the U series processors. During a multi-threaded run of Cinebench R15, the Core M processor would hover between 1700 and 1800 MHz, but the Core i5-5200U would do the same workload at 2400 MHz and not deviate at all. On single-threaded workloads, the Core M has more headroom to allow the one core to clock higher, and on a single-threaded run of Cinebench R15 it would clock as high as 2600 MHz. However there was a lot of variance during the run, and the Core M-5Y71 would fall as low as 1200 Mhz, with the majority of the time spent between 2000 Mhz and 2200 Mhz. Broadwell-U on the other hand would stay exactly at 2400 Mhz again during the same workload, with very little change in frequency during the run. As compared to Broadwell-U with a 15 watt TPD, the Broadwell-Y limits clock speed quite a bit more. Let’s go through some benchmarks to see how much this affects the Yoga 3 Pro, and especially if the IPC improvements with Broadwell can make up for the lower TDP.

For our benchmarks, I have selected a sample of similar devices in which to compare against. I have also included the Dell XPS 15, which has a quad-core CPU, GT750 GPU, and 91 Wh battery to bracket these scores on the high end. To compare against the low end, I have included the HP Stream 11, which has the Atom N2840 processor. It is interesting to note that the Atom (rebranded as Celeron) has a slightly higher TDP (7.5 watts vs 4.5 watts of the Core M) and it will be a good comparison to see how much more performance Core has than Atom. To compare the Yoga 3 Pro against any other devices, please check out our Notebook Bench.

PCMark 8 - Home

PCMark 8 - Creative

PCMark 8 - Work

PCMark 8 - Storage

PCMark 7 (2013)

PCMark 8 has four workloads which are Home, Creative, Work, and Storage. Each has a different set of workloads which Futuremark believes represent a good sampling of tasks for each category. Here the Yoga 3 Pro does very well, with scores that are more often than not well above the Yoga 2 Pro’s Core i5-4200U. The Broadwell Core i5s in the XPS 13 still pull a good lead here. The 7.5 watt Bay Trail-M in the HP Stream is sorely outclassed by the 4.5 watt Core M.

TouchXPRT 2014 Overall Score

TouchXPRT 2014 Beautify Photos

TouchXPRT 2014 Blend Photos

TouchXPRT 2014 Convert Videos for Sharing

TouchXPRT 2014 Create Music Podcast

TouchXPRT 2014 Create Slideshow from Photos

Our next benchmark is TouchXPRT 2014, which is a Windows Store app. It performs several common tasks for a typical home user, and converts the time taken for each task into an overall score. Once again, the 4.5 watt Core M compares very favorably to the 15 watt Yoga 2 Pro processor. In almost all of the tests, Core M is ahead of the Haswell Core i5-4200U of the Yoga 2 Pro. In order to achieve these scores, the GPU driver was updated to the latest version on the Intel site which fixes a problem with the Video Conversion score. We had the same issue with the XPS 13, so if you are the owner of a Broadwell laptop, you may want to update your drivers. The Atom core once again is decimated by Core M.

Cinebench R15 - Single-Threaded Benchmark

Cinebench R15 - Multi-Threaded Benchmark

Cinebench R11.5 - Single-Threaded Benchmark

Cinebench R11.5 - Multi-Threaded Benchmark

x264 HD 5.x

x264 HD 5.x

Cinebench is a good long benchmark which shows us how the CPU will perform when maxed out for the duration of the benchmark. Here we can see where Core M starts to falter. On long sustained workloads, it has to cut the CPU frequency to keep within its thermal envelope, whereas the Broadwell-U and Haswell-U CPUs can keep the clocks a lot higher. While running the multithreaded R15, the Core M would hover around 1800-1900 MHz with all cores in use, and the Broadwell-U would lock in at 2400 MHz and stay there for the duration. x264 is similar, and is a very long benchmark. The higher power envelope of the U series processors allow for more work to be done. You can see the quad-core Dell XPS 15 really pulls ahead on these benchmarks, and the HP Stream continues to fall well behind.

Mozilla Kraken 1.1

WebXPRT

Once again, in web use, the Core M processor is very similar to the outgoing Haswell U based Yoga 2 Pro. Just to put the numbers in a bit more context, I also ran the benchmarks on my Core i7-860 based Desktop (running Chrome, as were the Yogas) and it is pretty clear just how far we have come. The i7-860 is a four core, eight thread 45 nm processor with a 2.8 GHz base clock and 3.46 GHz boost, all in a 95 watt TDP. It was launched in late 2009. Five years later, we have higher performance in a 4.5 watt TDP for many tasks. It really is staggering.

There seems to be a general concensus that Core M equates slow, but clearly this is not the case. For some sustained workloads, yes, the 4.5 watt TDP limits how much performance you are going to get from the CPU, but for many tasks, especially short burst loads, the performance of the 5Y71 is very competitive, often outperforming the Haswell Core i5-4200U from last year’s Yoga 2 Pro. This says a tremendous amount about the Intel 14 nm process, because the IPC improvements of Broadwell vs Haswell are fairly limited. Clearly the CPU has quite a bit of headroom on the 14 nm process to keep the clock speeds up.

 

Display GPU Performance
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  • nathanddrews - Friday, March 13, 2015 - link

    Broadwell GPU performance is such a letdown. Is there any chance of combining Core M with a dGPU or would that only work with the other Intel SKUs? It would be nice to get the battery efficiency of Core M when you need it, but then have the option for GPU power when you need it. Reply
  • Zizy - Friday, March 13, 2015 - link

    I don't see any gains using M (vs U) in perf/W. Adding dGPU would mean fans so you lose that benefit as well. Therefore, why bother? :) Reply
  • nathanddrews - Friday, March 13, 2015 - link

    Cost savings, perhaps? Remember the Atom/Ion combos?

    I admit it seems like a waste of time and effort given what's already possible with a regular U-SKU.
    Reply
  • Gigaplex - Friday, March 13, 2015 - link

    Perhaps I missed something, but I don't think the Core M chips are cheaper. In fact I heard they were more expensive. Reply
  • fokka - Friday, March 13, 2015 - link

    intel lists a price of 281$ for its core m CPUs, from the 5y10 to the 5y71, which incidentially is the same price it asks for its i5 5200u.

    http://ark.intel.com/de/products/series/83614/Inte...
    Reply
  • CaedenV - Friday, March 13, 2015 - link

    The CPU is so extremely low performance that it would choke almost any dedicated GPU. Plus you would get terrible battery life, have to add fans, a thicker design, etc. etc.
    If you are going to put in a dGPU then you really need a u-SKU product in the first place. This is just a glorified netbook. Fine for browsing the web, watching shows, and playing simple games like cards or angry birds, but that is it.
    Reply
  • 3ricss - Friday, March 13, 2015 - link

    That is exactly right. We need to remember the purpose and audience this device is designed for. And based on this being a netbook I feel the price point is way to high. Better off considering the dell xps 13 or even SP3 at this point. Reply
  • defferoo - Friday, March 13, 2015 - link

    not sure why everybody thinks Core M = netbook. netbooks use Atom processors, this CPU is clearly in a completely different league in comparison. I'm almost certain that you wouldn't be complaining about it being a netbook if Intel kept using the old Y-series branding and the CPU was called a Core i5-5071Y. Reply
  • fokka - Friday, March 13, 2015 - link

    it might also have to do with the low tdp why people keep comparing it with netbooks.

    on another note, if intel would keep the core-i naming scheme for the chip, i'm sure the 5y71 would be an i7 (and cost 400 bucks...)
    Reply
  • mkozakewich - Sunday, March 15, 2015 - link

    Also considering that newer Atoms have like 2x the performance at less power, and Core-M has nearly an order of magnitude more performance. Reply

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