I have a desktop with amd a4 5300 and gtx 750ti. When im playing csgo on my pc, the game lagging almost 30-50 fps which make me feel weird, before i started to change graphic card from amd r7 240 to nvidia gtx750ti (msi).. the game running well on my r7 240 before using the gtx750ti , when im playing other games like paladin, nfs payback and tomb raider.. all of these game running smoothly without delay. Is this caused by the older cpu and motherboard or graphic card?