Need answers about this Gaming PC

I am new here, welcome me  

I'm looking at buying this PC,

http://www.ebay.co.uk/itm/AMD-Phenom-II-970-Quad-Core-G...

Just wondering, I researched the CPU and found that it only supports 1333Mhz RAM modules however this PC has a 1600Mhz RAM module, am I right in saying that 276Mhz will be un-used? Or have I got the CPU info wrong?

Also is this a good PC for gaming?

I have contacted the seller and he can change components for me, would you have anything changed?

I'm not a hardcore gamer so I don't need anything over the top

Thanks for your help