LG has showcased a new OLED gaming monitor at a trade show in South Korea this week that its calling the worlds fastest screen. This new 27-inch display features a huge 540Hz refresh rate, but it intriguingly also offers a 720Hz mode. However, the latter mode has a massive restriction, though, which we'll address in a minute.OLED displays are the premium choice for gamers, and our best gaming monitor guide is filled with OLED models across different resolutions, sizes, and budgets. This LG display certainly has a claim to be one of the first to feature a 540Hz rate, given that it was only two months ago that the Samsung Odyssey G6 OLED was unveiled as a "world's first" with a 500Hz refresh rate. Continue reading This new 720Hz OLED gaming monitor from LG is ultra fast, with one big catchMORE FROM PCGAMESN: Best graphics card, Best gaming PC, Best SSD for gaming