8320 is about like a sideways move. It's not better than what you have, just different.
"My main Purpose of using processor is gaming, good fluid fast ui experience, never lags,no hanging problem, Sometimes i need to render animation but not much"
The i5-2310 should be providing that. It's up there with the fastest processors, honestly. If you are not getting that good experience, then it's not the CPU, but something else.