Samsung shipped its own Exynos in the Galaxy S6 this spring and left Qualcomm off its flagship entirely. That is the fact that explains everything about the Snapdragon 820 Qualcomm detailed in New York this week. Losing the biggest phone maker on the planet from your top chip is the loudest no-confidence vote a silicon company can get, and it happened because the Snapdragon 810 ran hot, throttled under load, and earned a reputation Qualcomm spent a year denying instead of fixing. The 820 is the apology, written in silicon, and on paper it is a good one.

The headline is that Kryo is here, and Kryo is custom again. After the 810’s detour through ARM’s stock Cortex-A57 cores, Qualcomm has gone back to designing its own, a quad-core 64-bit Kryo CPU running around 2.2 GHz in a two-plus-two arrangement. Qualcomm’s claim is up to twice the performance and twice the efficiency of the 810’s A57 cores, and while I always halve a vendor’s “up to” numbers on reflex, the architectural logic holds: a core you tune yourself, on a better process, beats a hot reference core you grabbed in a hurry. This is Qualcomm getting back to the thing it told us mattered in the first place.

The process is the other half of the fix. The 820 moves off TSMC’s 20nm planar node and onto Samsung’s 14nm FinFET, the same family of process that made the Exynos in the S6 so efficient. FinFET transistors leak less and switch cleaner, and moving the 810’s thermal problem onto a 14nm node is the single most important decision in this chip. Around the Kryo cores Qualcomm has rebuilt basically everything: an Adreno 530 GPU it pegs at 40% faster than the 430, a Hexagon 680 DSP, a new Spectra image signal processor handling sensors up to 28 megapixels, and the X12 LTE modem pushing Category 12 speeds up to 600 Mbps down with triple-carrier aggregation, plus 802.11ad Wi-Fi on the 60 GHz band. There is also Sense ID, an ultrasonic fingerprint reader that works through grime and sweat, and a Smart Protect layer doing on-device malware detection. Qualcomm’s framing is that every major block is a new custom design, and for once that is close to true.

Here is the uncomfortable part, and I am not going to pretend it away: there are already overheating rumors about the 820 itself. The reporting is that Samsung is evaluating the chip for the Galaxy S7 and looking hard at its thermals, and Qualcomm is doing exactly what it did with the 810, denying any issue loudly and early. I have seen this movie. The difference this time is that the 820 is a fundamentally different chip, custom cores on a cooler node, so the engineering reasons to expect a repeat are weak. But Qualcomm denied the 810’s problems too, right up until reviewers cooked them on camera, and plenty of people lived with the consequences in phones like the OnePlus 2 (that I own btw, like the OPO). So I am keeping my powder dry until a real S7-class device sits on a bench under sustained load. No phones ship until the first half of next year. Whatever Qualcomm says now is a promise, not a result.

The competition is not waiting. Apple’s A9 is excellent, Samsung’s own Exynos 7420 already proved 14nm FinFET works beautifully in the S6, and MediaTek is throwing core counts at the problem with the deca-core Helio X20. Qualcomm needs the 820 to land cleanly, because the company’s last year was defined by a chip that did not, and you could hear it in the earnings calls. Qualcomm has also rebranded its standalone modems under the Snapdragon name this year, the X5 through X12, the same connectivity story that has run through everything since CES set the tone in January. I am skipping the regulatory angle, the modem-licensing fights brewing in Korea and China, because that is a separate fire and this post is about the silicon.

What I keep landing on is that the 820 is Qualcomm admitting the 810 might be a mistake without ever using the word (but you can let the competition an empty slot anyway). Custom cores (yeah), cooler node, every block rebuilt, and a quiet prayer that Samsung comes back. The phones are months away. If they run cool, this is the comeback. If the overheating whispers turn out to have teeth (and the limit of ARM evolving only upon of node process breakthrough), Qualcomm has a much bigger problem than one bad chip (but I think every supplier will come to that issue at some point).