Fans and Thermals

While Surface RT was passively cooled, Surface Pro features two integrated fans to cool the 17W Core i5-3317U. For most light use cases, those two fans will remain spun down and you can’t hear them. Do any sort of serious multitasking or start using Surface Pro as a real PC instead of a tablet and you’ll quickly hear them spin up. Fan noise is audible but not annoying - it’s very similar to the sound you’d hear out of any ultraportable with a couple of tiny fans spinning up.

In landscape mode with the Type Cover attached, Surface Pro draws in cool air from the sides and exhausts it out of the top of the device. Rotate the device into portrait mode and the fans will switch directions, drawing in cool air from the long edge and exhausting it out of the short edges. The fan direction switch is triggered in tandem with display rotation, so as soon as you see your display rotate you’ll hear the fans change direction.

The two fans do a good job keeping the CPU cool (I saw typical CPU core temperatures between 50C - 60C), but Surface Pro does get warm. I measured a max surface temperature of 41.8C while running 3DMark 11. That’s towards the top of the unit, around where the Core i5 CPU is located. On the edges I measured a max surface temperature of 36.5C. There’s no getting around the fact that Surface Pro gets warm, noticeably more so than the 4th generation iPad. It never gets uncomfortably hot however.

Despite being a tablet, the Core i5-3317U had no issues hitting its max turbo frequency of 2.6GHz. I even saw 2.75GHz for a very short period of time (remember, Intel’s Turbo Boost can exceed max TDP until the silicon gets up to temperature).

Storage and USB 3.0

Surface Pro ships with a micro SDXC slot along the edge of the device. Courtesy of Intel’s HM77 chipset, you also get a full blown 6Gbps SSD and a single USB 3.0 port - both significant upgrades over Surface RT. In my 128GB review sample, Surface Pro features a Micron C400 SSD. Microsoft is sourcing from multiple SSD vendors and claims to be shipping with optimized firmware, but I don’t know what other vendors are in the mix. Update: It looks like the C400 SSD is an mSATA drive, likely similar to the one we reviewed here a while back.

To put this in perspective, the C400 is in the same class of storage device that’s used in Apple’s MacBook Air. Although some ARM based SoCs feature SATA interfaces, pretty much all of them are paired with eMMC based NAND storage solutions that are horribly slow. The fastest sequential transfer rates I’ve managed on the 4th generation iPad are typically on the 20 - 30MB/s range, whereas the C400 in the Surface Pro is good for over 400MB/s in reads and just under 200MB/s in writes.

There’s been a lot of debate over the amount of free space available on Windows RT/8 tablets fresh out of the box. My 128GB review sample was partitioned down to 110GB with roughly 8GB used for the recovery partition. Of that 110GB, 89.5GB was free space that remained. I don’t really view this as false advertising by Microsoft (both Macs and PCs have been sold like this for decades), but you do need to know what you’re getting into here. Given the already high price of these systems and the relatively small price differential between a 64GB Surface Pro and a 128GB model, I’d recommend going for the latter. Microsoft claims something like 29GB of free space remains on the 64GB model - enough for some apps and data, but keep in mind like all solid state storage you don’t want to completely fill up your drive either (this is also true for ARM based tablets like the iPad).

USB 3.0 is equally as impressive on Surface Pro. Using a simple USB 3.0 to SATA adapter I could easily read and write at around 200MB/s. Compare this to the ~20MB/s you get on most ARM based tablets and it’s obvious that this Surface deserves its Pro moniker.

Ultimately Surface Pro’s storage subsystem is a big part of what separates it from the current crop of ARM based tablets. While it’s possible to run productivity workloads on many tablets these days, there’s truly very little that separates what you can do on Surface Pro with what what you can do on a conventional PC.

WiFi Performance

Similar to Surface RT, Surface Pro uses a 2x2 802.11n WiFi controller from Marvell. I believe this is likely the same Marvell Avastar 88W8797 WiFi solution, but connected over USB instead of SDIO.

WiFi performance is appreciably better than on Surface RT, connected to a 5GHz 802.11n network I was able to pull a maximum of 87Mbps compared to 42Mbps on Surface RT. This is competitive with what I’ve seen on other high-end tablets based on ARM architectures, although lower than what I’ve gotten out of a MacBook Air.

WiFi Performance - iPerf

WiFi range is subjectively really good on Surface Pro and a lot better than most ARM based tablets I’ve played with. I ran an iperf test on an iPad 4 and Surface Pro around 100 feet away from an AP through several walls and saw roughly an order of magnitude better performance out of the Surface Pro (8 - 10Mbps vs. 0.95 Mbps).

While peak WiFi performance out of Surface Pro is similar to a high-end tablet, worst case performance is more like a good notebook. Overall I’m pleased with the wireless stack on Surface Pro.

Surface Pro as a Windows 8 Notebook Display: Awesome if Calibrated
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  • Dekker - Wednesday, February 6, 2013 - link

    I don't even like the 16:9 ratio on desktops or laptops because it letterboxes most of the stuff I work on. Particularly, because toolbars, menus and window borders eat up masses of vertical space.

    On a tablet, 16:9 is pretty hopeless for the same reason. In addition, for app developers it is next to impossible to write an app that is usable in landscape and in portrait mode.

    In that sense, this review is a bit disappointing as it focuses mostly on the specs (if only it were a bit cheaper, less heavy and had more battery) and not enough on the usage model and software needed to support the tablet form factor.

    I would be interested to know if Anand was able to write an article while on the go or cover a conference using the Pro. My guess is that it can be done, but it would not be an experience worth repeating.
  • phillyry - Saturday, February 16, 2013 - link

    Anand addressed the form factor in his Surface RT review, which he wrote on the RT.
  • Da W - Wednesday, February 6, 2013 - link

    Can you replace the SDD?

    I would take my Kingston Hyper X 256GB from my soon to be former laptop, i would only need to buy the 899$ 64GB version.
  • Netscorer - Wednesday, February 6, 2013 - link

    No, the SSD is soldered and you can not even access it, anyway. Your options are either to buy a 128GB version or rely more extensively on flash storage that you can add via microSD. Of course, flash is very slow, so you won't be able to drive programs off it.
  • netmann - Wednesday, February 6, 2013 - link

    How do you know the SSD is soldered?!! Have you look inside the Surface pro? I don't recall Anand mention it in the review. I have not heard of SSD soldered to motherboard!
  • Jaerba - Wednesday, February 6, 2013 - link

    He didn't, but the Surface Pro team just did in their reddit AMA.

    "[–]SurfaceTeam[S] 28 points 5 hours ago
    Hi, this is Ed on the development team. The internal solid state drive built into Surface is not accessible for upgrade. However, the recessed micro SD memory card slot gives you unlimited memory expandability. The SDXC slot supports the highest performance SDXC memory cards."
  • Netscorer - Thursday, February 7, 2013 - link

    As Mr. Smith said in Matrix, it was "inevitable". No ultrasmall portable has a luxury of extra space to accommodate for mSATA port and bracket. Same goes for memory.
  • netmann - Thursday, February 7, 2013 - link

    Well, the latest update from Anand's review indicates the storage is in fact a Micron mSATA SSD. I suspected this because the MS Surface has eMMC as storage which has a lot slower performance.

    I do not think mSATA SSD could be soldered onto the motherboard so most likely it is a separate card that is connected to a slot on the motherboard similar to Apple MBP or Asus Zenbook, therefore it could be upgraded to a larger storage and faster mSATA. The question remains if the mSATA is a standard one or is it a propriety Blade (Gum Stick) one?
  • Death666Angel - Thursday, February 7, 2013 - link

    The Samsung ATIV Pro has an mSata SSD which is user replaceable.
  • thecoldanddarkone - Wednesday, February 6, 2013 - link

    I really like this review it recognizes the strength and weaknesses of the platform. I've seen a lot of really bad reviews on the surface pro. Some of the complaints are because the reviewer doesn't know how to use windows 8 (it's a desktop os, it has options, it's not Microsoft's fault you couldn't find different lock options...), others want to complain about the kickstand for 5 paragraphs and others expected it to act like an Ipad. It's not a perfect product, but it's what I would consider as a baseline product. I'm hoping this forces oem's to make better and cheaper products that are like this. That will resolve much of the software situation for windows 8, most of the scaling issues are a result of lazy programmers.

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