Can I put a 2nd Proc. in my G5?

Hey everyone. I bought a SINGLE 1.8Ghz PowerMac G5 in 2003 and a little over a month later they came out with the DUAL 1.8GHZ for the same price. I wanted to die.

Is there anyway to get a 1.8Ghz G5 Proc. and just stick it in my Mac to make it a DUAL?.... or no?


Thanks in advance.