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by delta_p_delta_x
1259 days ago
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> note that the TDP on AMD cores (Intel and the rest too, but especially AMD) is misleading Reviewers should put this in BIG ALL-CAPITALS BOLD ITALICS at the top of their reviews, all the time. The TDP rating of any given CPU in most cases is completely unrelated to the actual performance of said CPU. This is most egregious in notebooks, where it's actually the PL1/PL2 limits that matter. In my notebook's case: it contains a Xeon W-11955M (TDP supposedly 45 W), but while gaming or rendering, the CPU regularly draws nearly twice that. In fact, in notebooks, the thermal setup frequently affects the performance of the CPU and GPU by more than ±20-30% compared to the baseline. CPUs (and now GPUs, too) also include a variety of clock-scaling mechanisms like P-states, C-states, SpeedStep, Speed Shift (hardware P-states), etc that allow the CPU to sip a mere 0.2–0.5 W while doing nothing, and ramp up to 150+ W when demanded. For accurate comparisons, reviewers should lock CPUs to a maximum power draw, and test CPUs at that fixed power draw. |
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This is done by some reviewers, but it also only accurately tests efficiency rather than performance (or potential for performance given suitable conditions).
This is also why you mostly see laptop performance reviews instead of laptop CPU reviews.