Is a V12 engine always more powerful than a V8 engine?
Marketing is at play here. BlueFalcon has it correct. It is not always completely true that motherboard manufactures use cheaper parts to create power planes. The high ends at ASUS, Gigabyte and the rest can contend in price of a server power plane. But now that the crowed believes that more = better, why move from it? Furthermore, the technique of VRM hasn't changed, its just been tweaked to the nth degree as of late. We have smarter and faster chips due to lower feature size (transistor size). We are getting better performance per a phase with each generation. Early 2000s, we were still mastering all the things we have today in advanced home computers. So quality wasn't as good, so more did in fact help. But now, its all marketing and expectations.
24shadesphase of BS
Actually I was wondering if it is mathematical calculation for more stable power with certain amount of phases. I know it is faster more accurate switching since the went digital VRM.