The UK-based Raspberry Pi Foundation has recently introduced a newly revised Raspberry Pi 4 Model B single-board computer, with the most notable change being the addition of a second DRAM chip, creating a 'Dual RAM' version, with the material change notice (MCN) numbered PCN 45. This adjustment aims to address the global memory shortage driven by the AI boom, helping Raspberry Pi maintain production amid tight DRAM supply. Currently, DRAM manufacturers are prioritizing capacity allocation toward higher-margin products for large cloud data centers and AI-related applications, increasing procurement pressure for small and medium-sized manufacturers. By adopting a dual-DRAM-chip configuration, the foundation gains flexibility to switch between multiple DRAM suppliers, reducing the risk of production line shutdowns. On the new version's PCB, the second DRAM chip is placed on the back of the board, with corresponding adjustments to the layout of some passive components. Raspberry Pi stated that 'extensive' testing has been conducted on the newly introduced DRAM components, with hardware specifications and performance metrics kept as close as possible to the original single-chip solution to ensure no change in user experience. In terms of manufacturing processes, the new Raspberry Pi 4 incorporates the 'intrusive reflow soldering' process first used on the Raspberry Pi 5, which helps improve solder joint quality and overall board reliability, reduces production scrap and electronic waste, and enhances manufacturing consistency and sustainability. The dual-memory version does not introduce any additional hardware features and remains compatible with existing Raspberry Pi 4 modules and various expansion accessories. Users will need to use a new bootloader containing pieeeprom-2026-01-09.bin and pair it with a relatively recent Linux kernel or the official Raspberry Pi OS for optimal compatibility and stability. In the future, this dual-chip design may be adopted across all capacity variants, with both single-chip and dual-chip board types coexisting on production lines. Users can identify the dual-memory revision by checking if an additional memory chip is present on the back of the physical board, if the front silkscreen year marking reads '2025,' or by executing the command cat /proc/cpuinfo when running the latest Raspberry Pi OS—if the 'Model' field displays 'Raspberry Pi 4 Model B Rev 1.5,' it indicates the dual-memory revision. Previously, Raspberry Pi raised product prices for the second time this month, primarily due to ongoing DRAM supply constraints and the 'cannibalization effect' of AI industry demand on memory, exacerbating cost pressures for the boards.