Hi, I was on the market trying to find a used gaming system. but instead i found a peculiar desktop configuration. Core i7-4790K, 16GB DDR3 Memory, coupled to a 120gb SSD. All this was fine but the Motherboard was the one in question. There was no GPU installed on it and it was an MSI B85M-G43 base. The whole setup is on sale for about 300$. My question is, what GPUs could i fit onto the Motherboard? And also, how could i upgrade/make the whole setup faster? Finally, should i just save my time and go for a better spec?