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The maximum Graphics memory is ok, it supports up to 1.7GB which is ok as per the amount there.
Now, regarding the Graphics Memory in use, depending on what you are doing, it will use more or less graphics memory, so this behavior is regularn in your system.
I recommend you to visit this article, which explains more about Graphics Memory: http://www.intel.com/content/www/us/en/support/processors/000005472.html
Hope this can help you to get your inquiry clarified.
If any additional questions or inquiries are present, feel free to contact us back.