How can I identify different hardware components (hard drive, cpu, gpu, etc). Based on it's manufacturer.
For example, Nvidia Geforce GTX 580, several manufacturers, all differently priced, some may be a bit differently from other cards.
How can I know that product A is not product B. The reason is of course that I am going to link to hardware components from different sources. So how can I know that something is the exact same product?