i have 2 graphics cards currently and im thinking about putting them both in my pc but i dont know if they can crossfire. i have an AMD Radeon R7 240 2GB DDR3 and a AMD Radeon HD5570 1GB DDR3 im wondering if i can crossfire them or not and if i cant then can i put them both in my computer? i have an MSI 970 Gaming motherboard that has 2 PCIE x16 slots and if i can put them both in what does it do? any benifits for having 2 GPUs in my system?