A couple of weeks ago I offered a brief performance preview of the $799 entry level Surface Pro 3 with an Intel Core i3-4020Y. The performance hit in going down to the $799 model is significant but compared to an upgraded ARM tablet you do get substantially more functionality/performance. The big unknown at the time was battery life. Going down to a Y-series part comes with a reduction in TDP (15W down to 11.5W), which could have power implications.

I spent the past week running and re-running battery life tests on the Core i3 model of the Surface Pro 3. For the most part, battery life hasn't changed. As you'll see from our laptop results, the Core i3 Surface Pro 3's battery life shows a slight regression compared to our Core i5 results but not significantly so:

Battery Life 2013 - Light

Battery Life 2013 - Heavy

Although our laptop tests didn't show any gains, our tablet workload showed a substantial increase in battery life for the Core i3 version vs. the Core i5 Surface Pro 3:

Web Browsing Battery Life (WiFi)

An 11% increase in battery life is likely due to the lower power binned Y-series Haswell ULx part. It's interesting to me that the gains are exclusively in our lightest workload and don't appear to be present under any of the more active workloads. The decrease in TDP would imply a reduction in peak active power consumption but perhaps that's more a function of the reduced clocks. What we see at lighter/more idle workloads is a reduction in leakage thanks to the Y-series part.

I still feel like the best overall balance of battery life, storage, performance and price is going to be a Surface Pro 3 equipped with a Core i5. I think where the $799 Core i3 makes sense is if you're budget limited and left with the choice between a 64GB ARM based tablet or the entry level Surface Pro 3. The problem is typically users who stretch their budget to get a 64GB ARM based tablet want the storage space, which is something you sacrifice when you move to a 64GB Windows 8.1 device (roughly 21GB free on a new install). I don't see the $799 Surface Pro 3 necessarily catering to the same market as a high end ARM device, but I think the entry level SP3 does embody Microsoft's mission better than any of the more expensive configurations. There's very little cross shopping between a $499 ARM based tablet and a $1200+ Surface Pro 3, but the entry level SP3 can serve as an in-between device if you want some of both worlds. 

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  • dylan522p - Tuesday, August 5, 2014 - link

    It's even easier to undervolt the SP3 than it is to do anything remotely similar with a ARM based Android tablet.
  • pukemon1976 - Wednesday, August 6, 2014 - link

    Simply root and install SetCPU? You forgot you need an unlocked bootloader to flash a custom kernel to allow customization that deep. Not that simple.
  • fire115 - Thursday, August 7, 2014 - link

    dont be a hater pukemon, its not very hard to unlock the bootloader on SP3
  • nerd1 - Tuesday, August 5, 2014 - link

    I think the best balance between power, heat, battery life is underbolted i5 version without turboboost.
  • MrSpadge - Wednesday, August 6, 2014 - link

    Deactivating Turbo on low-TDP parts is a particularly bad idea, as you're robbing yourself of significant single-thread performance gains. A far better option would be to leave turbo active but to lower the power consumption limit / target (if you feel a need to do so).
  • invinciblegod - Tuesday, August 5, 2014 - link

    I thought windows 8.1 was designed to fit into less space. Why is there only 21GB left?
  • Thermogenic - Tuesday, August 5, 2014 - link

    Recovery partition takes up a fair amount of space, allowing you to "refresh" your installation. It's pretty sweet too if you are ever in the unfortunate situation of needing to do so.
  • Wiidesire - Tuesday, August 5, 2014 - link

    The i3 version has 37gb of free space and the Recovery Partition takes 50gb. If you move that one to an external USB stick you get 42gb of free space.
  • Wiidesire - Tuesday, August 5, 2014 - link

    *takes 5,08 gb. Sorry, I'm on mobile right now.
  • kyuu - Tuesday, August 5, 2014 - link

    I'm struggling to understand how it can only have 37GB of free space. Even with the recovery partition, I still have enough space to install a game or two on my 32GB Dell Venue 8 Pro. I wouldn't expect there to be crapware on a Surface, so what is taking up all the space?

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