Lenovo Converged HX Series Installation And Service Manual page 51

After the setting is saved, the system needs to be rebooted before the change takes effect.
Direct Cache Access (DCA) Mode
To enable DCA on HX Series Type 8689, enter BIOS menu (F1) and set the following: IntelRCSetup→
Processor Configuration →Direct Cache Access (DCA): Change to [Enable]
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Chapter 2 Configuration information and instructions