Thanks for joining the Desktop Board community.
I understand you are looking for a way to disable hardware prefetch feature.
I have found some forums mentioning how to disable this feature and they all talk about entering BIOS and disable it through any CPU tab configuration.
I regret to inform you that the motherboard model DQ87PG does not provide any option at BIOS level that helps enabling or disabling such feature.
Intel suggests you keep checking this post for any other community member that has experienced same issue and provide solutions to your request.