AMD 64 voltage

I have a noob question here :
my processor is an AMD 64 3000+ (winchester)
and I want to ask if the voltage (shown in cpu-z) should be at a constant 1.40v, because in my case it changes from 1.402 , 1.378 , 1.368, 1.393 :?

i use a MSI k8n Neo4 platinum
1GB corssair XMS TwinX
leadtek px 6600td
seagate baracuda 7.200 8mb cache 80 GB
and........ a no name power suply 400 w
the PC is functioning at standard parameters I made no midifications

Yes, those voltage ranges are normal. No worries.

-mpjesse