If you're talking about gaming across 3 monitors, then I would say the 270 will fall short of expectations. If you're only gaming on one monitor and you mean doing stuff like work, video editing, web browsing across multi monitors it's fine.
Running multiple applications at once with a desktop spanning multiple monitors isn't particularly taxing on the video card, it's more important to have a capable processor (will depend based on what programs you're using) and adequate memory.