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What type of psu is compatible to upgrade the graphics card from a 1050 to a 1660 ti?

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Your unit is supposed to have a 300W, without a PCIE power cable.

Because of the variations in power requirements, as some 1050 75W card (like EVGA) require 6 pin PCIE power plug, and the 1660ti  120W card requires an 8 pin PCIE power plug. Because of your varied need, and the desire to do it once, IHMO you need a CorsairCX550W PSU It would have the required PCIE power plug. Most have a 6+2 plug, so it works as a 6 pin or an 8 pin.

Right now PSU prices are wildly up and down in the price per watt.   A 450W is $170, a 550W is $74 and a 650W is $84.

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