Try this one to start:http://www.anandtech.com/showdoc.html?i=1483&p=1
The reveiwer isn't the brightest but you can hit the "select" tab bottom right to go to your specific requirement.
Your most reliable resource will be the software houses tests ie. www.discreet.com etc.
Some really great benchmarks can be found in the 3D ring (and problem devices too). try 3Dark....digitalanimators...3Dlink...3DGate...Highend3D
Depends on what your doing, generally speaking I'd say no.
"no kelder....you can't shoot goblins in wordpad"