Hello Even if your tower case is in good condition, I would answer you like another user You may have connector problems, which may be specific and difficult to adapt. Power supplies can also be difficult to replace. And you will be limited for the motherboard by the fixings, the format most likely As long as you do, for a small additional sum, change everything You will find a box where you can install any type of motherboard, and it will be easier for the power supply! You can even have a larger case, and this will be ideal for a graphics card, HP cases are often quite limited in place to see also more location for hard disk storage etc!
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