Rumor mill: As performance ceilings rise across flagship mobile chipsets, the constraints of conventional smartphone cooling are becoming impossible to ignore. Qualcomm's upcoming Snapdragon 8 Elite Gen 6 series appears to be the latest test case – and, according to persistent reports from supply chain sources and Chinese social media, the company may finally adopt Samsung's Heat Pass Block (HPB) system to bring its thermals under control.
The Heat Pass Block first appeared in Samsung's 2nm Exynos 2600, reportedly delivering a 16 percent improvement in thermal resistance. It's a copper-based layer built directly onto the processor die, providing a direct pathway for heat to dissipate before it can radiate through surrounding components.
The DRAM module, traditionally stacked above the system-on-chip, is instead positioned adjacent to it – an apparently simple rearrangement that reduces heat concentration and allows copper's high thermal conductivity to work more effectively.
Qualcomm's last flagship chip, the Snapdragon 8 Elite Gen 5, demonstrated the performance gains Qualcomm was willing to chase – and the consequences that came with them. That SoC managed to edge out Apple's A19 Pro in Geekbench 6 multi-core performance, but only by drawing roughly 61 percent more power, which highlighted how aggressively Qualcomm was pushing thermal limits in pursuit of benchmark leadership.
On paper, Qualcomm's next-generation silicon promises another significant leap. Tipsters on Weibo claim internal testing of the 8 Elite Gen 6 Pro has already hit frequencies around 5 GHz on its performance cores. Such speeds can be sustainable in open-air lab conditions, but when confined to the tight spaces of a smartphone chassis, heat buildup quickly becomes the bottleneck. That dynamic has made thermal design the next major frontier in SoC engineering.
Even the anticipated transition to TSMC's 2-nanometer node, with its improved energy efficiency, won't fully offset those thermal pressures. The efficiency advantage of the smaller node is quickly negated when clock speeds are scaled up to extract every bit of performance headroom.
That's why direct-source cooling solutions, such as Samsung's HPB, are now being viewed not as experimental features but as necessary structural improvements to support the next wave of mobile performance scaling.
According to reports, Qualcomm has been evaluating HPB as one of several mechanisms to stabilize thermals under peak-use scenarios. Conventional vapor chambers and graphite sheets, long mainstays of smartphone cooling, are showing diminishing returns as SoC power densities climb.
If Qualcomm does integrate HPB into the Snapdragon 8 Elite Gen 6 family, it could mark the company's first major architectural pivot toward die-level heat management. It would also signal acknowledgment that legacy cooling strategies, however refined, have reached their limits in the current smartphone form factor.
While none of these details have been officially confirmed by Qualcomm, the consistency of leaks from Weibo-based sources – such as the tipster known for early Exynos 2600 details – suggests a credible pattern.
Qualcomm may borrow Samsung's cooling tech for its next Snapdragon flagship
