Is this good for gaming? AMD Athlon II X2 370K

Unless you're only interested in older games you really need to get a quad core or a dual core with hyperthreading at the very least (Core i3). I would avoid dual core Athlons, and Pentiums because they are unlikely to be supported by upcoming titles and you're likely going to see more Far Cry 4 and Dragon Age Inquisition situations, where the dual core chips won't even launch the game without some kind of third party hack, which may or may not be available for future titles.