I initially wanted to buy two GTX 670's but someone told me this isn't necessary because I have a 1920x1080 resolution monitor @75Hz, and that the framerate with one GTX 670 on that resolution would never drop below 75. So I was considering upgrading my two Radeon HD 5870's (1GB) to a single GeForce GTX 680, or the fastest single GPU on the market. Would one flagship Nvidia card be faster than two antiquated ATI Radeon cards? The Nvidia GK104 "Kepler" card is a fire-breathing beast and takes the throne as the fastest graphics card on the market. My ATI cards only have 1GB of memory each, which limits performance on high resolutions and with anti-aliasing enabled. The Nvidia cards come with 2 or 4GB of memory, which should give me a noticeable improvement in many situations. Future games like GTA5 and Crysis 3 will make use of more VRAM. I was curious if a single GTX 680 would outperform my two Radeon cards in crossfire setup.