Dell e4300 - windows 64 bit questions

Hi guys!

I just got  old  dell latitude e4300 from my uncle with windows 7 32bit

.I know dell e4300 is not good for games  but since CPU is 64 bit based i was thinking to switch to win 64bit... i also add 2gb more of Ram so now i have 6 gb

Now my question is since on my PC i mostly play game called Dragon nest and i was also able to run it on this laptop with no lag but i kinda got fps drops  when there is alot effects going around in game..

Would windows 7  64 bit give  me a bit of a speed?  or better performance?

Thanks for answers!