Hopefully you get rid of your old D 820 system soon, as testing NV cards with a budged 2.80 P4 based dual core cpu against a 8 core system (who else uses server hardware at home) based on Clovertown with 1.86 is not really fair.
When doing card comparisons, it's all done with the same system and everything with the only changing variable being the card. I imagine you're referring to the ET:QW benchmarks? Those were two separate articles and weren't meant to be compared across articles. There will be some direct cross-vendor benchmarks of ET:QW shortly.