13 year old trying to build a pc :
If you want to game across three monitors with high settings, you'll need a pretty powerful graphics card. When I built my computer two years ago, I used a GTX 680 to do triple monitor gaming, and that was barely enough to run games at playable frame rates on fairly high settings, but definitely not at a solid 60fps. If you lower the settings, you might be able to get a better framerate, but I'd still recommend a card at least as powerful as the GTX 680, which could be the GTX 770 or the R9 280X. Obviously, the more powerful card you get, the better, but the cost also goes up.
As a guide, you can take a look at the
SBM article on Tom's. Last quarter, they used three computers, one with an R9 270X, one with a GTX 970, and one with a GTX 980, and they tested them at high and ultra settings at 4800x900 and 5760x1080, which are triple monitor setings. The GTX 680 I mentioned would be between the 270X and the 970 in performance. This might give you an idea of the framerates you'd get at different performance levels across several levels.[/quotemsg]
so a R9 280x will be good enough for games ?
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It will be, but if you want a solid 60fps you'll probably need to lower some graphics settings, or step down to 4800x900. You an always add a second 280X later, if you have the proper PSU, and that should suffice for triple monitor gaming at high settings.