AMD like all makers is transitioning to smaller nodes as appropriate. It's a huge financial investment to drop nodes. Any node lower than 32nm results in minute performance gains and is primaritly for lower power consumption. For most desktop users 32nm is not an issue. AMD has just transitioned to 28nm with Kaveri. Most people don't understand the minimal gains for the huge investment as node size is reduced. For all practical purposes it's pointless for most of the market.
GloFo has working 20nm but there is no rush to use it because it doesn't offer any particular advantages nor does Intel's. The smaller node size is used primarily for marketing.
Intel has stopped their development of larger wafer sizes and lower node sizes because of world economics and the billions required to continue development. Intel didn't even furnish the latest Fab due to lack of demand for CPUs.
Building a reliable PC involves more than just assembling the parts. You need to be able to configure all of the BIOS settings appropriately. This can be quite involved and frustrating as it can require a lot of trial and error with stress testing. It is however often the only means to get a 100% reliable PC.