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HBM3e

HBM3e designates a type of operating memory, specifically an improved version of the "High Bandwidth Memory 3" standard, where the letter "e" denotes an enhanced, faster revision of the HBM3 standard (vendors interpret it as "enhanced" or "evolutionary"). Unlike conventional RAM, which is found in separate modules on the motherboard, this memory is integrated directly onto the same package as the graphics chip or another AI accelerator. Its design is based on the vertical stacking of several memory chips, allowing for a very wide communication path to the processor. Thanks to this architecture and the short distance from the computing core, the memory can transfer enormous amounts of data in a short time, which is referred to as high data throughput. This feature is crucial for artificial intelligence applications that work with extensive data models and require immediate access to a large volume of information. This prevents the creation of a so-called bottleneck, where a powerful processor would have to wait for data and its potential would not be fully utilized. To understand how it differs from conventional gaming graphics memory, a comparison with GDDR (Graphics Double Data Rate), such as GDDR6 or GDDR7, is helpful. GDDR consists of individual chips placed on the board around the graphics core and relies on very high clock speeds over a relatively narrow bus (typically 32 bits per chip). Memories in the HBM family take the opposite approach. They run at lower clock speeds but, thanks to vertically stacked chips and an extremely wide bus (1024 bits or more per stack), they transfer more data at once. The result is significantly higher total data throughput for HBM and a better performance-per-watt ratio, which is crucial for data centres and AI training. GDDR, by contrast, is cheaper, easier to manufacture and easier to scale in capacity, which is why it dominates in gaming and consumer graphics cards.

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