Yes the CPU is not soldered so you can indeed replace it however i would highly recommend against doing so. The motherboard supplied has only a single 4 pin cpu power header which due to the lack of a 24pin ATX connector on the board has to do double duty for other systems. As a result going above the current 51W TDP chip could be dangerous to your system. Furthermore the power supply included in the system is an anemic 180W which means you CANNOT put any dedicated graphics card in it without causing a risk of overload. As built the system likely draws near enough 100W. An I5 6400 is as high as i can recommend upgrading and realistically I would save your money for something newer and more capable.