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If that Lumia flagship launches at Mobile World Congress in March, that means Microsoft could potentially have the more robust phone in terms of the processor's built-in features. Since so much of a phone's power comes directly from its processor -- like the rapid-charge capabilities -- drastically different processing capabilities can significantly change all that a handset can do.
The story so far
Earlier this week, Microsoft was one of six mobile phone makers to go on the record backing Qualcomm's latest processor, the Snapdragon 810 (LG and Motorola were two others). Conspicuously absent in the lineup is Samsung, a longtime Qualcomm partner.
Relations between the two companies seem rocky; in mid-January, Samsung dropped the 810 as its chipset for a variant of the Galaxy Note 4 with LTE-A support. The same day, rumors emerged that the Galaxy S6, would debut with Samsung's own Exynos chip rather than Qualcomm's.
On January 14, DigiTimes reported on this rumor: Samsung's fears that the Snapdragon 810 would overheat led to an internal decisions that Samsung would start selling the Galaxy S6 with the company's own chipset from its Exynos family instead. DigiTimes' story and others estimated that 80-to-90 percent of the first-production phones will use Exynos. Not every DigiTimes story pans out, but Bloomberg corroborated at least part of the report using its own anonymous sources, noting the huge blow to Qualcomm to lose such a valuable partner.
DigiTimes' stories and others noted that later runs would switch over to Snapdragon as planned, but not until a full quarter after the Exynos processor is added. Cowen analyst Timothy Arcuri told CNET that Qualcomm has likely already worked out the 810's kinks. The main "problem" now, Arcuri said, is that production is two or three months behind schedule.
It's worth noting that releasing a Qualcomm version and an Exynos version of flagship is part of Samsung's usual mode of operation. What's different here is the suggestion that Samsung's movements are influenced by a problematic chip.
Although Microsoft is only one partner to support Qualcomm, it's perhaps the most significant. It has yet to release a high-end Lumia bearing Microsoft's name (after buying Nokia in 2014) and the brand suffers from the common perception that Lumia phones are less feature-rich than Samsung flagships.
LG and Xiaomi have already launched phones carrying the Snapdragon 810: the G Flex 2 and Mi Note Pro, respectively.
"We've had no issues with the Snapdragon 810 in our G Flex2 which launched this week in Korea after lengthy quality testing," LG spokesperson Ken Hong told CNET, "We attribute that to our engineers understanding the importance of that balance. We can only assume that others who haven't had this level of success haven't put the same kind of effort into their device design."
Xiaomi and Qualcomm declined to comment. CNET has contacted Samsung for comment.
Why the processor matters
Processors are responsible for far more than just fast task-completion speeds. They can also help govern faster data transfer (if they use an integrated modem, as Qualcomm does) and lay the foundation for other features that can make a phone special.
For example, high-definition range (HDR) image processing takes place on a chip, and so does the extra-fast charging capability found in phones like Motorola's Droid Turbo and in Samsung's Galaxy Note 4. In most cases, phone-makers can choose to use a feature and can often enhance it themselves by building custom software around a core feature.
What the Snapdragon 810 brings is the ability for the phone to handle online 3D gaming on 4K displays and 4K streaming, in addition to quick-charging and photo features.
It supports 64-bit computing, which is important to advanced mobile gaming, and runs on eight cores rather than the four cores of other chips like the Snapdragon 801.
Phones that use the chip can also affix cameras with sensors of up to 55 megapixels, compared with an upper limit of 21 megapixels on the Snapdragon 801.
Here's another trick as well: this is the first chip to support a certain type of wireless charging, known as magnetic resonance, which can top up devices nearby. By contrast, the wireless charging technology know now requires you to place devices in a specific area, like a charging pad. Qualcomm calls this WiPower, and its Snapdragon 810 processor is the first commercial product that enables it.
What's more, phones that use the Snapdragon 810 chip can also theoretically lend power to other devices, like a laptop or wireless keyboard, even if the two aren't touching.
Depending on the processor features that vendors like Microsoft or LG want to take advantage of in their phones, flagships that use this chip could have an advantage over phones that don't.
A whole lot of 'if's
There are a lot of unknowns riding on this scenario. First, we don't know for sure what Samsung will do, or even what the features in this Exynos chip are. Its latest chipset, the Exynos 7 Octa, supports up to 16-megapixels on its camera and is used in a variant of the Samsung Galaxy Note 4. It's possible (but unlikely) that Samsung could unveil an Exynos chip with specs that match up to Qualcomm's chip capabilities.
Second, we also don't know for sure if Microsoft will have a flagship phone at Mobile World Congress in March, although it's likely this will happen, or if that phone will use the 810 or an older model.
Third, we won't know until that future Lumia phone is announced how many of those features Microsoft would put to use. Lastly, we can't be sure that a new Snapdragon 810 Lumia and Exynos Galaxy S6 would debut in the same market at the same time.
My main point is this: processors are more important to a phone's capabilities than many people realize. Switching out the processor for a rival chipset that does less could also trim down some important conveniences and bonuses, like 3D gaming and 4K streaming. It can even put a cap on the camera's performance.
We'll know for sure what Samsung's plans are on March 1, and likely Microsoft's, too. CNET will be on the ground in Barcelona, separating rumor from reality.