With the 300W power supply being a concern, the 750 Ti is a good choice and would likely work without an issue. What would also be a good choice and work without an issue and offer similar performance is the GT 1030. They offer similar performance. The 750 Ti is faster but the 1030 uses a lot less power, which might be something you want to look into with that 95W Q8300. Just keep an eye out if you decide the 1030 is right for you. They released a DDR4 version of the card that won't give you the same performance.