X2 3800 or Opteron 165?

[Growly]

I don't have my own, but as a guess from the colours (this is pretty much what freakBYnature said):

Red wire = 5V
Black wire = Earth / Ground / lower potential than the other two
Yellow wire = 12V
Blue wire = the one that sends pulses for RPM counts (which allows the motherboard to then use PWM accordingly to change the fan speed)

[freakBYnature]

I don't have my own, but as a guess from the colours (this is pretty much what freakBYnature said):

Red wire = 5V
Black wire = Earth / Ground / lower potential than the other two
Yellow wire = 12V
Blue wire = the one that sends pulses for RPM counts (which allows the motherboard to then use PWM accordingly to change the fan speed)

Isnt the yellow 7V? 5+7=12 ... Since 12V is max? 5+12=17V, that can't be right... but correct me if I'm wrong