AMD bad warranties
As a computer retailer, try and get an defective AMD CPU swapped out - one big nightmare. With Intel I have had two bad CPU's since I started trading 12 years ago and in both cases swapouts are effortless. Since last year we decided to stop selling AMD due to bad warranty service - no matter how good a CPU is, if you can't trust their warranty service, it is like playing Russian roulette - maybe it will work, maybe not but we can not afford to take that chance when a better and faster CPU with proven aftersales service and support is available.
We also had a lot of customer feedback to help our decision - we had two identical systems set up, one with AMD 4400+ dual core and the other a Core2 Duo 6300 and customers could play with both demo systems running the same apps and games. End result - eveyone went for Intel