G5 Dual 1.8GHz

[Stephen Foster]

Just after I ordered a G5 1.8 out comes the Dual 1.8. I thought this 
meant two processors each at that speed but it appears to mean two 
processors totalling that speed (i.e. two 900GHz processors). Why is 
it better to have the same speed split between two processors rather 
than just having one processor. Intuitively it would seem to increase 
the chances for conflicts/problems/glitches. Just wonderin'.
Stephen
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"A man cannot step into the same river twice; for neither is it the 
same river nor is it the same man." Heraclitus c. 540- c. 480 BCE