Assuming you have DDR4-2933Mhz or faster RAM, the difference in performance between the GT1030 and the integrated Vega 11 will be minimal. Save the $100 or put it towards either a faster GPU at a later date or a SSD. Also the CPU performance of the 2400G would be quite similar to the i7-4770k with the 2400G being about 5-7% faster at the same clock speed. Therefore the 2400G will NOT be bottlenecked by the GT1030, you would need more like a GTX 1080 for the CPU to be the bottleneck.