Keep in mind that you are using a laptop or notebook computer, which design is highly oriented to power saving. Therefore if your computer is not demanding too much power from the integrated video controller the system may lower the frequency and power provided to it and order to save energy (specially when using just the battery).
In this case you can try disabling any power saving features on the system BIOS of the notebook, set the operating system to run in full power through its power options or power schemes and check with your computer manufacturer to verify that the hardware installed is working properly.
My power plan is High Performance, in power options for this plan there is intel hd graphics settings, where I have set option to high performance, like in graphics options....
Today I've recodnized that my DDR3 ram which must run @ clock speed 800 or 1066mhz, runs at speed of 667MHz!
When I bought this pc it had win7 preinstalled, maybe they just set power saving tweaks or something....
Can you please Diego_Intel explain in details how to set power settings in bios... if only its possible... thx
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What you are seeing is normal and is not a problem. The graphics hardware is capable of modulating its speed up or down based on load. Under most circumstances (surfing the web, working with productivity software, etc), the graphics hardware is very lightly loaded and will run at the minimum frequency that it can for power savings (366 MHz in your case). If the work is more demanding, the hardware automatically increases frequency up to its nominal "maximum" frequency (500 MHz in this case). If there is thermal headroom (e.g. if the CPU cores aren't too busy at the same time), then Turbo kicks in to push graphics frequency higher (667).