The memory is the bottleneck on the Geforce 2MX not the core.
For maximum performance keep increasing the memory speed until you start getting lockups are artefacts (3DMark and Serious Sam are good tests). Then just back off on the memory speed until it's stable
I increased my memory clock to 180 mhz from 143mhz it seems very stable but the nvidia control panel doesnt allow the memory clock setting to be higher that 180 mhz.
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