looking for way to upgrade PSU on a acer aspire TC-875 D17E5 need cables

Okay so I think I can upgrade my power supply with a Corsair CX 450 watt modular power supply that I have I need a 24-pin to 8 Pin and I think a 24-pin to 6 pin any advice on how to do this would be helpful in any advice on what not to do would also be helpful

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