Nothing in your gaming computer is useful for mining bitcoins, you will waste money trying.
But you might be able to mine litecoins, if you have an AMD card. With Nvidia it's next to pointless.
I have a Intel I7 3770K Oc'd to 5Ghz 24/7 -- I use an AMD Radeon HD 7870 Ghz Edition OC'd as well
I couldn't make money at idle time with this? Do I have to spend bitcoins or $ to mine bitcoins?