Link to the card:
http://www.newegg.com/Product/Produc...82E16814133452
This PNY model is basically just a reference model with a decorative covering on the heatsink shroud. It should function like most reference 670 models, which is to say it probably won't overclock extraordinarily well, and it will be somewhat loud, particularly at idle.
This is the same cooler used on multiple Nvidia reference cards, starting with the 670, but also the 660Ti, the 660, and now the 650Ti Boost, and all reviews have mentioned a similar issue - an audible grinding noise at idle. If you are looking for the quietest solution at idle, this isn't going to be it.
I owned two EVGA 670 models based on this design, and they were both equally loud at idle. They're pretty loud at load as well, but many cards are, including most blower-style cards.
All that being said, for $320, the performance will be nearly unbeatable when comparing stock-clocked cards, as long as you're willing to wait on a big rebate. It most definitely is
not worth $370.
Also, as a heads up, I'd just caution you that it would be quite bottlenecked in your current rig (q6600@3.0), but perhaps you're doing a complete system upgrade.