"If the leading metrics are performance/$ and performance/watt"
But they aren't. The OEMs build what will sell. A few customers care about AMD. More insist on Intel. But most base their decision on price and features. So they look at the box and the price tag.
For the OEMs, those metrics hold more of a sway. But power consumption is only one factor in the overall equation. Other factors are there, such as chipsets and motherboards. Motherboards for an A64 are probably cheaper because there are less packages required to build a motherboard, it will have less layers for a given form factor and so on. nVidia's chipset, for example, is a single chip for desktops. And it shows. Since HP lets you do an apple to apple comparison, you can configure identical AMD or Intel systems that differ only in processor and motherboard. For equivalent performance, the AMD solution is cheaper for all the ones I have checked. Try it some time.
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