Sapphire Radeon HD 4830 512MB
 

I don't think there's a "stock" 4830. Sapphire usually runs that route with the non-Toxic or their other variants, but I'm pretty sure that it's up to the board partner to build a better 4830; they're all different. Each has its own heatsink and board layout. Sapphire's is, at least, true to the namesake, and mega-blue.

http://www.thetechlounge.com/article...HD-4830-512MB/

of course there is a ATI reference stock card used and produced by many partners, what is this guy talking about:)