笔记本里的高端独显，为何非得要“自废武功”

Core Viewpoint - A certain brand allegedly exceeded NVIDIA's power limit for the RTX 5090 mobile GPU, leading to exceptional performance but resulting in sanctions and a return to standard power designs [1][3]. Group 1: Performance and Modifications - A user claimed to have successfully modified the RTX 5090's power limit from 175W to 225W, achieving performance surpassing the desktop RTX 4080 without instability [5]. - Other users reported similar modifications, with one user pushing the RTX 4090 to 270W and achieving a 3DMark TimeSpy score of 26,600, significantly higher than the standard [5][7]. - The experiences suggest that the 175W power limit imposed by NVIDIA restricts the performance potential of high-end mobile GPUs [7]. Group 2: Technical Considerations - The mobile RTX GPUs share cores with desktop versions, yet the mobile variants are limited to lower power thresholds, which may not reflect their true performance capabilities [9]. - Increasing power beyond the set limit may yield diminishing returns in performance, as seen in the example where a 54% increase in power resulted in less than a 30% performance gain [13]. - The power limit may represent an optimal balance between power consumption and performance for mobile GPUs [13]. Group 3: Market Implications - NVIDIA's power restrictions may be aimed at maintaining a consistent market performance across different brands and models, preventing quality discrepancies among batches [15]. - Allowing manufacturers to customize power limits could lead to competitive disadvantages for lighter laptops, as gaming laptops would outperform them significantly [17]. - This could discourage manufacturers from using high-end GPUs in lightweight models, limiting the market for these chips [17].