I know about the 3.5 of 4GB of RAM showing with Vista 32. All I really want to know is there a big difference between 32 & 64? All I really do is play a FPS game. I do play many hours a day though. I have a Dual Core CPU. I have 4GB of RAM. A mobo that holds up to 8GB of RAM. Dont know if this little info helps with an answer. If there is a huge difference, will I be alright with gaming for now? Plus, I snagged Vista Ultimate for $50. JYEAH! Thanks for the help!