Opinion on this gaming build?

I have the Intel Core i5-2500K Sandy Bridge, and man, I think its a processor that wont let you down when needed it can go up to 4.2 and the thing is, its auto or maybe thats just a function in my motherboard which is a MSI P67A-C43, an I have 4GB of RAM and I found out thats not enough lol unless your doing simple gaming or something, well I guess for me I like to have Internet opened, iTunes and w/e game I'm playing but I think you should be good, I gotta upgrade 6 or 8GB of RAM, taking the CD reader from an older computer should be just fine unless this is like a windows 98 computer or something than no... but just awesome, as for the motherboard idk that brand nor have I even heard of it but I hope it does good... lol sounds a lot like my motherboard although like I said its a MSI.