The fastest GTX460 is also the quietest,
Gigabyte GTX460 1GB Superoverclock
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125345
According to Guru3d, the card comes in as the quietest of 18 cards tested at 37dB, along with the ECS Black 1GB (another excellent choice http://www.newegg.com/Product/Product.aspx?Item=N82E16814134117).
Unfortunately, the MSI Hawk and Cyclone come in at 43dB.
http://www.guru3d.com/article/gigabyte-geforce-gtx-460-soc-review/8
Quote:
"From the top of my head I can tell you that this was GeForce GTX 460 card number eighteen that we have tested to date. The overall baseline performance of the GeForce GTX 460 is of course commendable, this particular SOC card comes factory overclocked a good chunk higher, making it the fastest GTX 460 we actually tested. The card as tested today performs roughly at GTX 470 level, and that means it is in fact competing with the Radeon 6850 and sometimes even the 6870.
It doesn't stop there though, you can really benefit from a manual overclock as well thanks to the cooler. 850 MHz is just not an issue either and thanks to the very silent WindForce 2X cooler the temperatures remain very much under control. Now if you are willing to do so, add a little extra GPU voltage as shown on our overclocking pages, if you set it at 1.088 Volts you'll pass 900 MHz. Our maximum upper limit was roughly 950 MHz, and that was really pushing it."
http://www.guru3d.com/article/gigabyte-geforce-gtx-460-soc-review/19