Vostro 3500 running Windows 7 without problem, then upgraded to Windows 10.
CPU maxed out at 38% regardless of Power Options.
Eventually traced to BIOS setting: SpeedStep [Enabled].
The HM57 chipset in the Vostro 3500 does not appear to be supported by the latest Intel® Chipset Device Software (INF Update Utility) but the 'Unknown Error' failure it gives is not particularly helpful. Using the latest chipset driver that does not fail to install has no effect on the problem behaviour.
Disabling SpeedStep results in normal CPU operation.
Q: Has anyone duplicated this problem on a Vostro 3500 / HM57 chipset?
Q: If so, has anyone found a 'better' solution?
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Windows 10 / Vostro 3500 / SpeedStep results in very slow performance
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