AMD, hasn't updated their CPU line in ages, such as the motherboard and stuff. Intel has many more features and is often a better by because Intel CPU's are in most workloads that exist today in consumer industries. trying not to over complicate things.
There is a whole topic about this, Refer to this: http://linustechtips.com/main/topic/479999-amd-faces-class-action-suit-over-bulldozer-missrepresentation/ We don't really need that to start here too.