That would be a basic explanation, if you want to understand it better: http://www.hardwaresecrets.com/article/Everything-You-Need-to-Know-About-The-Motherboard-Voltage-Regulator-Circuit/616/1 On the last page at the end it summarizes, whether or not you do OC, the phases should be taken into account because they affect durability.
This is a forum dedicated to overclocking and other techniques to exploit hardware, I'm not exactly sure what you're looking for. If your question is whether that board will work, then yes it will work just like one that costs 45€. If you ask if it's the best purchase you can make with 100€, it depends like everything: For less than 100€ you have boards with better power supply, there are also others with more PCIE, others from more prestigious brands, etc. Like everything, there is variety, first you should know what you need, or what you are going to do with the PC, and then consider the purchase.