For that money,you`re looking at an Nvidia FX5500 or ATI 9550.
To get a 5900XT secondhand asap,would be a bit of a task.Theres only one on ebay at the moment,and theres over 5days left.
You could be in luck and someone on here has one lying around
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Que faire si son iPhone ou iPad est tombé dans de l'eau ?