Welcome to the community! The engine which KSP uses, uses only one core on the processor(and it doesn't really use the GPU much). Also, why 2'5 inch drives if you can have 3'5(the default size) The processor is cheap, but the videocard not. I suggest you to buy a better processor, and a less better video card so you get the same price. So, with the setup now... not what you would expect. If you buy a better processor and a less better video card, it will run perfectly.