Shocking Pixel 6 rumor lists Google SoC with two ARM X1 CPU cores
What in the world is going on?
So Google is building the Pixel 6, and with it, the company is dumping Qualcomm and introducing its first in-house main SoC (with help from Samsung): the “Google Tensor SoC,” aka “Whitechapel.” Other than talk about Google’s AI special sauce, there’s hasn’t been much info about the core parts of Tensor like, say, the CPU. A reasonable expectation for a company building its first SoC is that things won’t get too ambitious, Google will mostly play within the guardrails set up by ARM, and after shipping a modest, cookie-cutter SoC, the company will learn from its first design and iterate. A new report from XDA Developers’ Mishaal Rahman claims that that line of thinking is wrong, and that even with its first design, Google isn’t afraid to get its hands dirty by blazing its own trail in SoC design.
Recall how ARM SoCs generally come with three tiers of CPU cores: a big CPU for bursty processing like launching apps, medium cores for sustained performance, and small cores for background duty and low-power processing. Rahman says he has a source with a real-life Pixel 6 Pro and offers up the following CPU specs: two 2.8GHz Cortex-X1 cores, two 2.25GHz Cortex-A76 cores, and four 1.8GHz Cortex-A55 cores.
Google’s lineup of CPU cores is unlike anything else on the market. Qualcomm’s Snapdragon 888 and Samsung’s Exynos 2200 both have one Cortex X1, three Cortex A78s, and four Cortex A55s. You aren’t supposed to have two X1 cores. These are the big cores that can do some serious processing, and cramming two of them into a smartphone could lead to incredible performance. Or it could also lead to extreme overheating. You’re also not supposed to use A76 cores, which are from last year. Everyone else’s “medium” cores are the newer, faster A78 core.
Compared to the typical design, Google swapped out one of the medium cores for a second big X1 core and then turned down the remaining medium cores by switching to cores from last year. Maybe downgrading the remaining medium cores is an attempt at balancing the heat output? At launch, ARM said a 5 nm Cortex A78 had 20 percent better sustained performance in the same thermal envelope as a 7 nm Cortex A76. But since Google is using 5 nm A76s, the A76 cores should be putting out less heat compared to A78.
So what exactly is the goal here? Is Google swinging for the Android benchmark crown with this dual X1 Frankenchip? It would be a shame to spend all these engineering resources on a custom solution and turn in a medium performance benchmark, when chips with medium performance benchmarks are readily available, out of the box, from several vendors. There’s a lot of effort being spent here that will hopefully be paid off somehow.
The Android community’s collective head-scratching Tensor journey started with this surprise entry in the Geekbench 5 database, listing a “Google Pixel 6 Pro” with that unprecedented 2 x 2 x 4 core layout. Geekbench info reads from an easy-to-fake file, but this didn’t seem like a fake, since it was already totally unbelievable on its own. Rahman says, “The build fingerprint, kernel version string, CPU frequencies, CPU clusters, GPU info, and more match the values from our source’s Pixel 6 Pro.” So it is very, very likely that this is a legit Geekbench run.
It’s important to point out that, for a flagship smartphone, this Geekbench 5 score is terrible. A Snapdragon 888 is somewhere in the range of 3300-3500, while Google’s Pixel 6 is scoring lower than a Pixel 4. We’re going to guess that this is due to lots of optimization and configuration work that still needs to be done and that it would be wrong to draw any conclusions from the score.
We’re starting to get a clearer picture of what’s in the Google Tensor SoC, even if the real-world performance is still a total wild card. Samsung’s Exynos unit is helping design the chip, and the other core components are very Samsung-y. The GPU is reportedly the same as the Exynos Galaxy S21, an off-the-shelf ARM Mali G78. The modem is also from Samsung (an Exynos 5123), which will mark the first time in a while an Exynos modem has come to US shores. Google is hyping up the AI-centric parts of the chip design and promises the chip will power onboard voice transcriptions.
With access to someone with a Pixel 6 Pro, XDA was also able to corroborate plenty of the other specs that have been floating around out there. The Samsung-made 50MP “GN1” image sensor for the main camera represents the Pixel line’s first image-sensor upgrade in several years. That rectangular camera lens is a 4x optical telephoto powered by a Sony 48MP IMX586, while the wide-angle camera continues Google’s love-affair with Sony image sensors from 2016: a 12MP IMX386
Other reported specs promise a computing powerhouse, with a huge 5000 mAh battery, 12GB of RAM, 128GB of storage, and Wi-Fi 6E. After taking a year off with the Pixel 5, Google sounds like it’s returning to the flagship race.
Before we go, we have to mention that Google is certainly hyping the Google Tensor SoC in its advertising. In Japan (which is apparently Google’s new second-favorite country now), Google is celebrating its first-ever in-house SoC by selling “Google Original Chips” on the Google Store—these are literally bags of edible potato chips, styled after each color of the Pixel 6. They all come in a “Googley Salty Flavor” and even have a big stripe across them to match the camera block. The video ad—where a woman charges a bag of Pixel potato chips with a USB-C plug—is really something.
We still have no idea when this phone is actually coming out. Android 12 is rumored for October 4—so presumably sometime after that.
Listing image by Google
via Ars Technica https://arstechnica.com
September 15, 2021 at 03:22PM