Samsung's evaluation of the "Snapdragon 8 Elite Extreme Gen 6" for the Galaxy S27 Ultra has run into performance drops caused by heat, South Korea's Seoul Economic Daily reported on October 16, 2026. If the chip does not meet Samsung's requirements, the company would reportedly turn to its own Exynos 2700 as an alternative.
However, no decision has been made to drop the Snapdragon, and the two companies are said to be continuing to make improvements and re-test. Even for a new-generation chip advertised at up to 5GHz, whether it can hold its performance for long periods inside a Galaxy chassis is a separate question. To read this report properly, you need to separate gains in computing power from the design that carries heat out of the device.
What went wrong in Samsung's evaluation
Seoul Economic Daily's English edition, citing multiple people familiar with the matter, said Samsung's mobile division is running final performance validation for its next top-end model. In internal tests, temperatures reportedly exceeded thresholds repeatedly, and processing speed fell under sustained heavy workloads. That corresponds to thermal throttling, where a chip slows down to keep temperatures in check.
According to the paper, Samsung shared the test results with Qualcomm in September and asked for improvements by mid-October. As of the report, the chip is said to fall short of the required thermal stability, though adjustments and re-testing are continuing.
The report does not say what temperatures were reached or how quickly speed dropped. The size of the performance loss and the test workload are also unknown, and it is impossible to tell whether the cause lies in the chip's power settings or in the device's heat-dissipation design. This is anonymous information from the company's English edition, itself an AI translation of a Korean article, so it needs to be distinguished from test results published by a manufacturer or independent measurements.
The claim that problems appeared in Samsung's evaluation therefore cannot be extended to a defect in every smartphone carrying the same SoC. An SoC is a chip that combines the CPU, GPU, and other components, but the temperature and speed users experience also depend on the design and control of the device that houses it.
Don't use 5GHz, thermal resistance, and sustained performance as the same yardstick
According to Qualcomm's product page, the Snapdragon 8 Elite Extreme Gen 6 has two Prime cores that run at up to 5GHz. Qualcomm cites a 13% CPU performance gain and a 44% GPU performance gain over the previous generation, and says GPU power efficiency improved by 40%.
These are the manufacturer's rated figures, not results from running the Galaxy S27 Ultra for extended periods. Rated computing performance, package thermal resistance, and device sustained performance cover different subjects and use different comparison conditions.
| What is being evaluated | What public materials show | What that number alone doesn't determine |
|---|---|---|
| Chip computing performance | Qualcomm claims up to 5GHz, with CPU performance up 13% and GPU performance up 44% over the previous generation | How long the chip can hold that speed inside a Galaxy chassis |
| Package thermal resistance | Samsung claims a reduction of up to 16% for Exynos 2600 versus Exynos 2500 | Device surface temperature, or the improvement rate of a different SoC |
| Device sustained performance | Android's official guide says it is constrained by the ambient environment and the device's heat-dissipation design | The temperatures, performance drop, and cause in Samsung's unpublished tests |
As of October 17, 2026, the table maps Qualcomm's product information, Samsung's Exynos 2600 product information "Pure thermal innovation" and note 9, and Android's Thermal API guide to each evaluation target. It is not a product comparison under identical conditions. Samsung's 16% figure is based on in-house testing against the Exynos 2500 and varies with usage conditions.
The table separates three qualities: "can process quickly," "conducts heat easily," and "can keep up the fast state for a long time." Maximum frequency indicates the upper limit of operation, but not how long continuous use can last. Even if package thermal resistance falls, temperatures do not necessarily drop by the same proportion, and that improvement rate cannot be applied to the Snapdragon or to the unannounced Exynos 2700.
The 40% GPU power-efficiency improvement likewise does not mean the whole smartphone's power consumption falls by 40%. Heat generation varies with the performance level used and with the load on the CPU and other components. Touting better efficiency and high peak performance is not a reason to skip thermal evaluation of the device as a whole.
How HPB connects the compute chip to heat-dissipation parts
In its technical explanation of mobile packaging, Samsung describes the constraints of conventional PoP. PoP stacks a DRAM package, which serves as working memory, on top of the package holding the compute chip. It fits into a limited area, but the DRAM on top constrains the path that carries heat directly from the compute chip to heat-dissipation components.
Samsung's HPB (Heat Path Block) changes this layout. It shifts the DRAM to a position that doesn't overlap the main heat-generating areas and places a heat-conducting member above the heat source. The aim is to make it easier to pass heat from the compute chip to heat spreaders and vapor chambers that spread it. HPB is actually used in the Exynos 2600.
This is an implementation example Samsung has published, not evidence that the Snapdragon package has the same structure. Samsung explains that moving the memory to create a heat path also requires changes to the connection with the memory and to the overall package design.
And the path continues beyond where heat leaves the package. Even if heat conducts easily around the chip, long-duration processing remains constrained if the device's heat-dissipation parts and chassis cannot release the heat they receive to the outside. This is a design implication drawn from publicly described heat-transfer mechanisms, not something that identifies which part was the problem in this Samsung device.
Control on the heat-generating side matters too. Google's Thermal API guide explains that once a device overheats, it must reduce its load below a sustainable level to shed heat. If a game's frame rate and image quality are adjusted beforehand, large speed drops are easier to avoid. Keeping the load within what can be sustained from the start and extracting maximum speed for a short time are different control goals.
The switch to Exynos and the year-end mass-production deadline
Seoul Economic Daily also reports a plan for mass production of the Galaxy S27 series at the end of 2026 and a launch in early 2027. The time available to wait for improvements is limited. The report is conditional: if Qualcomm meets the requirements, Snapdragon will be adopted as originally planned, and if the issue is not resolved, Samsung would consider the Exynos 2700.
What this shows is that an SoC adoption decision must satisfy performance and mass-production schedule at the same time. Having an in-house alternative does not by itself mean the device's sustained performance will be better. The chip must work as a device, including thermals and power consumption, and be supplied when needed.
For buyers, too, the useful next step goes beyond a single peak score. Run the same workload at the same ambient temperature and image quality, and track speed from the start until temperatures settle. If power consumption and the surface temperature you feel in your hand are also available, it is easier to judge how a speed drop translates into real-world use. With different firmware or operating modes, the same chip's results must be read differently.
What the Samsung–Qualcomm re-testing will test is whether the required performance can be maintained once the chip is built into Galaxy's design. If the outcome ties into the adoption decision and is also confirmed on retail devices after launch, it will become clear how much the 5GHz spec helps in everyday gaming and heavy processing.