TN LCD panel monitors. Yes, they’re fast for gaming. This is why I personally won’t use them though.
Read about this and join our forum: http://linustechtips.com/main/news-reviews-article-guides/linus-videos-news-and-ramblings/79004-tn-lcd-monitors
Buy non-TN LCDs at NCIX: http://ncix.com/products/index.php?minorcatid=1003