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I used Corsair - CX Series Modular CX750M 750W ATX Power Supply - Black Model Number: CP-9020061-NA SKU: 8324202 but it really depends on how much wattage is required for the components to operate. If you upgrade the graphics card you will need to get a 500w to 750w PSU.
Sorry, there was a problem. Please try again later.The only reason you would replace the power supply would be to upgrade it to support a high-end video card. It comes with 300watts which is fine for the base system. But if you are adding another high-end GPU card in the available slot then you should go for 450-500watt power supply to handle the extra draw. Otherwise you'll get brown-out reboots and lock-up problems. Not required, but recommended for really high end GPU cards, is adding another internal case fan to keep things cool. This is especially important if your tower is tucked away under something with blocked ventilation. Keep in mind these reccomendations are for the very high end GPU cars. Also, the case will only hold a GPU card up to 8" in length. It won't fit the big 10" cards.
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