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Hey guys, I was wondering if there is a program that checks how much power my system uses or do I have to do the calculations myself? 

I currently have a GTX 770, but I'm thinking about getting a 970 and possibly SLI it in the future. I have a 600W PSU atm, would I need to upgrade my PSU for GTX 970 SLI?

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https://linustechtips.com/topic/239599-checking-system-watt-usage/
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970 has a 145w tdp, so your power supply should be fine.

Case: Corsair 4000D Airflow; Motherboard: MSI ZZ490 Gaming Edge; CPU: i7 10700K @ 5.1GHz; Cooler: Noctua NHD15S Chromax; RAM: Corsair LPX DDR4 32GB 3200MHz; Graphics Card: Asus RTX 3080 TUF; Power: EVGA SuperNova 750G2; Storage: 2 x Seagate Barracuda 1TB; Crucial M500 240GB & MX100 512GB; Keyboard: Logitech G710+; Mouse: Logitech G502; Headphones / Amp: HiFiMan Sundara Mayflower Objective 2; Monitor: Asus VG27AQ

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Software is quite unreliable for measuring power draw. You'd want a load meter like a Kill-a-Watt. 

Whether you should upgrade will depend on the psu and how much you plan to oc.

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
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