In Gigabyte card...there is noise problem with fans..
Newegg.com - GIGABYTE GV-R785OC-2GD Radeon HD 7850 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card
There is solution as well
1) The vibration comes from a flimsy piece of plastic under the fan closest to the video ports. If you loosen the three screws that hold that fan in, lift up the fan and push on the plastic, you will feel how loose and flimsy it is and that it doesn't quite touch the aluminum tightly enough. If you shim a piece of electrical tape that's been doubled a few times under this piece of plastic, the vibration ceases!
2) *www.gigabyte.com/support-downloads/faq-page.aspx?fid=1876&pid=4155
I never bought anything from stores other than SMC...But they don't have Sapphire 7850 (as per their site)...Should I go with Gigabyte or ask them to arrange Sapphire 7850 ?