"AMD CPUs and GPUs are only worthwhile in low end desktops and media centres"
I agree about the desktops, but for media centres no. Not unless you mean a Windows media centre. Or have AMD finally joined the modern world and managed to get their Linux drivers doing more than 2.0 PCM over HDMI? I don't know because they couldn't bother sorting it out for too many years, so I gave up with AMD GPU parts for Linux.
I tried to build a media centre with a fanless AMD fusion e-350 mini-itx board when it came out. That is when I found out the only audio coming out of HDMI to the receiver under Linux was 2.0 PCM. That is as much use as a frog on acid for building a low power media centre.
It's a shame because instead of the fanless mini-itx e350/fusion boards ending up in media centre systems, the Atom/Ion based systems cleaned house. Even Intel IGP processors can stream multi channel HD Audio via HDMI/Display Port.
Have AMD managed it yet? I'm not wasting money on a low powered, fanless (if they exist) AMD A/E/C-whatever chip to find out when I know an Intel Celeron based HP 260, Chromebox, NUC/Brix will just work.
After their bright spot in the past of getting the price/performance ratio right and 64 bit support on x86 early, especially with the Opterons. The HE multi-core Opterons with HyperTransport were ahead of the Xeons around at the time and in DC usage where performance per watt = $$$ they were important.
Unfortunately AMD seemed to stumble and then become a 'remember us' company, in a constant state of catch up, trying to use price as the main selling point, but not managing to keep the performance high enough to make the savings worth while. :(