The power requirements of Trinity are moderate.
More importantly the power consumption is quite linear when overclocked.
There is no rapid increase in power consumption caused by leakage on Trinity.
Four, or even three-phase
CPU PWM will be absolutely fine for a APU with two CUs (4-cores) for all purposes.
However the integrated GPU makes nearly half of the total power consumption. Due the overclocking capabilities of the integrated GPU, I would not recommend anything less than 2-phase PWM for the UNB (Core & Graphics Northbridge). This is also seems to be the way most of the manufacturers are configuring their boards.
I do not recommend playing cheapskate when purchasing a board for Trinity, in case of overclocking is part of your plans.
Any high-end(ish) board from Asrock, Asus, Biostar, Gigabyte and MSI will be more than fine.
For maximum power efficiency (for HTPC etc), a board with a digital PWM is recommended.
Due the more advanced adjustments the effiency can be up to 10% higher.
The low-end boards use other shortcuts than just the PWM design.
+ A small hint, which should not be a surprise: A10 APU + overclock -> Make sure your DRAM is able to do atleast 2400MHz
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