Either way, even admitting NPD numbers at true, the units are extremely close, and the price cut will only diminish such difference.
The price cut won't do anything because retailers initiated a much deeper price cut and there was no change. If retailers changing the price to $330 wasn't enough then the manufacturer changing it to $399 isn't going to do anything either. Once again the VGchartz numbers over tracked Xb1 and undertracked Ps4, they've admitted they do this time and time again that is why it is their policy to go back and change the numbers to reflect NPD's much more accurate figures after NPD is released. http://www.gamasutra.com/php-bin/news_index.php?story=18919 They even admit they change their "methods" when it doesn't match up http://www.vgchartz.com/article/629/where-do-vg-chartz-north-american-numbers-come-from/ they also admit they are often off by 10-20% which they were in this case and you can bet they will go back to adjust those numbers.