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Intel documentation leak sheds light on the upcoming Arrow Lake-S platform. It is noted that future 15th generation desktop processors (Arrow Lake) may not have support for Hyper-Threading (HT) technology. The technical note lists the expected 8 performance Arrow Lake cores without any threads enabled via SMT. This is consistent with previous rumors about the abandonment of Hyper-Threading.
The loss of Hyper-Threading could significantly impact Arrow Lake's performance in multi-threaded applications compared to its Raptor Lake predecessors. HT is estimated to provide 10-15% speedup for multi-threaded workloads using logical cores. However, in games, disabling HT has a negligible impact and in some cases can even improve frame rates. Thus, the Arrow Lake family can achieve Intel's estimated 30% increase in gaming performance through architectural improvements alone.
However, the move away from traditional HT technology is likely to come with the new Rentable Units solution. This new approach is a response to the adoption of hybrid core architecture, which has seen an increase in applications using low-power E-cores to improve performance and efficiency.
Rentable Units is a more efficient pseudo-multithreading solution that splits the first stream of incoming instructions into two parts, distributing them to different cores depending on complexity. Rentable Units will use timers and counters to measure core P/E usage and send portions of the thread to each core for processing. This inherently requires a larger cache size. Arrow Lake processors are rumored to have 3MB of L2 cache per core. It is also noted that Arrow Lake supports faster DDR5-6400 memory.
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