Taken from newegg.coms Athlon IIx4 specs:
Brand AMD
Processors Type Desktop
Series Athlon II X4
Model ADX630WFGIBOX
CPU Socket Type
CPU Socket Type Socket AM3
Tech Spec
Core Propus
Multi-Core Quad-Core
Name Athlon II X4 630
Operating Frequency 2.8GHz
Hyper Transports 4000MHz
L2 Cache 4 x 512KB
Manufacturing Tech 45 nm
64 bit Support Yes
As you can see it does specify if it supports 64 bit.