Put yet another way:
Depending on your hardware and usage, 8 GB RAM in the x64 Edition
could be faster and show better performance than 4 GB RAM (x64 or x32 Edition), but...
There is NO simple, definitive answer - it depends on too many factors!!
For instance, I multiboot x64 and x32 software on this 4 GB lappy. Why? Because I can - that's all. Call it for 'bragging rights'.
Does x64 make a "huge difference"? No! I haven't run any benchmarks (other than ones built into Vista and W7 aka Windows Experience), but I cannot *feel* any difference at all between x64 and x32 OSs in this machine - not even enough for a placebo effect. My HD, integrated ATI chipset, and BIOS are the bottleneck(s) to performance in this machine. 4 GB RAM vs 2 GB *seemed* to make a difference, but I'm not even sure about that.
Personally, I don't think x64 vs x32 makes any difference (for the average user), nor 8 GB vs 4 GB, but once again - it all depends!
If all you do is email, social networking, and watch YouTube videos - certainly not! Conversely, if you're running a mail server, hosting a social networking web site, or making YouTube videos (especially if you're doing it all at the same time - on the same machine) that's a whole different ballgame - you know what I mean?
Really, all you can do is bite the bullet and tell US if it makes any difference...
