Can anyone let me know what is the fastest passive Nvidia GeForce card? From digging around it appears that there is nothing passive that is newer/faster than the Asus NVIDIA GeForce GTS 450. I appreciate that there are units like the 560 that could be modded but I would prefer off the shelf passive that I know is going to be silent.

Can you wait? While the Geforce GTX670 is the lowest of the series released so far and still uses 170W and is fan cooled, this is less power than the previous generation so it would not be too much of a suprise to see passive 650s and even 660s when they're out in a few months. These will be much faster than the 450.