Well, in my analysis of the results, it is truly neck and neck with the 5770, with the 5770 a small performance win (unnoticeable), a small power win (noticeable in long term use), and a large noise lose (noticeable every time you use it).
One could argue that with the twin DVI out, the nVidia 3D glasses, and CUDA and PhysX support, there is a feature win
with the GTX450.
If you hunt around for the "BEST" non-reference 5770 card out there, you can do better. But if you are a retail consumer in a retail outlet, I think the GTX450 wins.
If I were in the market for a 5770 performance card, I would go for the 450 over the 5770 for the twin DVI or the 3D glasses options alone. I would be ready to lose 5% performance for the extra feature set.
Nonetheless, it is a shame that nV couldn't outperform the 5770 in performance per watt. I really hope that with the 6000 series and GTX500 series there is more gain on performance per watt. I'm tired of power hungry noisy cards. I want silent. (-ish).