i didn't mean that to be taken too literally. They're hard to find now because that's what most people did with them. i got one for free because i stopped someone from throwing it away. It went 3.45GHz quad core overclocked. Too slow compared to the E520 so it's sitting in my closet. It would just about equal a Q9650 at stock speed. The E520 @ 3.72GHz is much faster.
At userbenchmark.com the E520 identifies itself as DM061. the non OC QX6800 scores 26%, the OC ones 43-44% CPU
http://www.userbenchmark.com/System/Dell-DM061/1322
The optiplex 780 scores 40% with a O9650, and 38% with a Q9550 CPU rating. Good enough for a cheap entry level gaming computer.
There were even a couple Q6600 scoring 36% because they were OC to 3GHz. but the...