AMD Athlon 64 Series CPUS... PLEASE HELP

I know all these motherboards support 64bit, but are any of them backwards compatible with 32bit?

If any of you will answer my dumb noob question I'd greatly appreciate it...

AMD Athlon II X4 620 Propus

AMD Athlon II X2 240 Regor

AMD Athlon II X2 245 Regor
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  1. Best answer
    Any x64 CPU is backwards compatible with x86.
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