I've just got my first 64-bit-capable laptop (previously I've only dealt with 64-bit on servers). Of course the first thing I am going to do is to format the hard drive and install Ubuntu instead of Vista, and the question is should I install 32-bit or 64-bit Ubuntu?
Here are the details which can matter:
CPU: Core 2 Duo 2 GHz, RAM: 3.45 GB. I am going to intensively use multitasking, virtualization (VirtualBox) and run memory-heavy Java, C# and native applications.
I ask because my experience shows that 32-bit desktop systems usually work faster and consume less memory. And as far as I know (have read somewhere, never tried myself) 64-bit Java is known to be extremely RAM-wasting compared to 32-bit JRE.