I have switched all my servers over to 64-bit, with 64-bit operating systems. The difference is astounding! 64-bit machines can address far, far more virtual memory addresses, also. 4 GB for 32-bit, 17 EXAbytes for 64-bit!!!
Of course, those are max values. Not suggesting you get THAT much RAM (at least not right away)!
Virtual addresses for Pentium Class (386 - 686) machines is 64 Terabytes. 16 bit segments plus 32 bit offsets)
-386wt (Old Intel Guy)