The older Graphics and Media Control Panel, Graphics Media Accelerator Driver control panels had lot of settings and Triple Buffering option was there.
In new HD Graphics Control Panel that I got for my HD 2500, pretty much no options, so no Triple Buffering option.
So, it depends on which control panel came for your system!
For older systems, below page is helpful!
I hope intel will release a new control panel with Advanced Settings
This message was posted on behalf of Intel Corporation
Triple Buffering is enabled by default. Intel improved a lot the graphics performance and decided to remove some features from the panel; this decision was taken as a recommendation of Windows 10.