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Question

Does the CPU throttling issues (e.g. clock speed stuck at 800MHz) on the W520 still exists with newest BIOS update?

Answer

The CPU throttling issues have been resolved a few BIOS revisions ago. (BIOS 1.33 and newer). However, if CPU and Nvidia Quadro GPU are both utilized on battery with High Performance power plan, the CPU may be throttled to 1.5GHz as the battery is unable to supply enough power (wattage).  Individual results may vary based on version of CPU i5 / i7 and max rated clock speed.

 

Real world application use vs synthentic benchmark results may vary.  If multiple cores of the CPU are engaged, lower top Ghz clock speeds may be indicated - this is normal operation of the turboboost feature operating within the total power envelope of the system.

 

To achieve maxium system performance when simulataneously drawing upon CPU and GPU, connect the system to AC and ensure the battery is installed.

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Comments
bloon

in order to prevent throttling using a w520 and discrete graphics on battery

system performance must be set to balanced

(not turbo or maximum turbo) otherwise it will still bin down to 800mhz turbo boost will not function

 

(verified with throttlestop in monitoring mode on a w520 with a Core i7-2760QM and a 9 cell battery on latest bios)

 

also maximum turbo does NOT yeild a performance benefit over turbo

it is a gimmick pure and simple (all it does is disable the intel power saver feature during idle)

according to my testing.

so you want turbo plugged in and balanced on battery power.