Hello Unlimitedgraphics, thanks for joining the Intel Community.
I would like to inform you that in order to over clock the Graphics Max Dynamic Frequency it will be necessary to know the model number of the processor you have.
If the processor you have is a Pentium J2900, I recommend you checking with the system manufacture, which seems to be Dell, if the processor could reach the Graphics Max Dynamic frequency which according to our site should be 896MHz. ARK | Intel® Pentium® Processor J2900 (2M Cache, up to 2.67 GHz)
Keep in mind that it is also necessary to have that option available in BIOS, so you would need to check if that feature is presented in the motherboard.
It is important to know that Intel® Extreme Tuning Utility (XTU) was design specifically for motherboards.
Intel® XTU is a feature that allows the user to modify the processor voltages and other settings to over clock it if the processor is an unlock version.
Intel® XTU is supported on Intel® Core processor only but I recommend you either testing an older version of the software or contacting the manufacturer to confirm compatibility.
In order to increase the graphics dynamic frequency, you would need to look for another type of software compatible with the motherboard, however I cannot assure it will work. It will be better to contact the system manufacture.