Another option, according to Poole, is that Apple could have went quad-core across its new Mac mini line, but it would have made it difficult for Apple to hit the $499 price point.
As I've said in other places, and said about the dual-core iMac, too...
The CPU in the low-end model is
one of Intel's most expensive mobile processors.
The 1.4 GHz chip is more expensive than many of the quad-core chips, including ones with Iris graphics instead of HD 5000 graphics.
Intel Core i5-4260U Processor - the only model that matches the specs of the low-end model; 1.4 GHz base speed, 2.7 GHz turbo, HD 5000. Max power draw 15 watts -
$315
Intel Core i5-4308U Processor - 2.8 GHz base, 3.3 GHz turbo, Iris 5100 graphics. Max power draw 28 watts -
the same $315 price
Intel Core i5-4670R Processor -
quad core, 3 GHz, 3.7 GHz turbo, Iris Pro 5200 graphics. Max power draw 65 watts (desktop CPU, better than the midrange 21" iMac.) -
cheaper at $276 - This should be the 'upgrade' processor.
The Mac mini line has used 65W-class CPUs before. I understand wanting to go low-power, but using a 15W CPU that is significantly slower than other,
cheaper CPUs, in a
desktop design is very strange.
Unless Apple is getting these i5-4260U CPUs as "failed power draw testing" CPUs, and they actually draw far more than 15W, so Apple is getting them for next to nothing, I fail to see the point of using these.
Apple does list "Maximum continuous power: 85W". With the parts mentioned, there is
no way to get near that, even under max load. So the mini has the power and thermal headroom to fit a faster, 65W desktop-class CPU in there. (Because most of the chipset power is included in the CPU, 20W is enough for RAM and SSD or laptop HD, with room to spare for external peripherals.) If they don't think that's enough headroom, go for the 37W or 47W mobile CPUs, those would have plenty, and have both dual-core and quad-core models available in reasonable price range.