I have a vapor x r9 290x and would like to get another for crossfire. The recommended power supply for one of these cards is 750w, so does that mean I need at least a 1500w power supply to run both cards?
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750W is the recommended wattage for a full system including one R9 290X. For crossfire, about 1000W will suffice.
No a good quality 1000 watt or maybe even 850 will do the job.