Contrary to belief, Snow Leopard by default (except for Xserves) runs in 32-bit mode. Check for yourself. Code: uname -a You should see something similar Code: root:xnu-1456.1.25~1/RELEASE_I386 i386 I forced it to 64-bit on my '08 Mac Pro and things were slower! Spaces was very slow. Dashboard was quirky. I say avoid it.