Seems to to be an anomaly on the configurator.
For example,when choosing a 450W PSU with certain GPU's, e.g. 7850/7870,it warns you that you should upgrade the PSU to a 600/650W PSU,but when you do that it tells you you only need a 300/450W PSU ?
All fixed, thanks for letting us know. Some exceptions are hard-coded into our configurator, whereas others can be set by us. The contradiction has been removed.