RTX 4090 Power Supply Requirements

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What power supply do you need to run an RTX 4090? Will your old 850W PSU be fine, or will you need to buy a 1200W monster? Or even wait for a PCIe-Gen5 PSU?

Sources:
https://www.tomshardware.com/news/1200w-power-requirement-rtx-4090
https://www.nvidia.com/en-us/geforce/graphics-cards/40-series/rtx-4090/
https://videocardz.com/newz/nvidia-geforce-rtx-4090-3dmark-scores-leaked-at-least-82-faster-than-rtx-3090
https://videocardz.com/newz/nvidia-geforce-rtx-4090-goes-up-to-3135-mhz-with-493w-peak-power-consumption
https://www.igorslab.de/en/nvidia-geforce-rtx-4090-where-the-mistake-with-the-600-watt-really-comes-from-and-why-the-cards-are-so-giant/
https://www.palit.com/palit/vgapro.php?id=4578&lang=en&pn=NED4090S19SB-1020G&tab=sp

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Chapters:
0:00 What PSU do you need for an RTX 4090?
9:15 Buy why are they SO BIG!?!?
11:14 Benchmarks: Is the factory OC even worth it?
13:00 RTX 4090 (Stock/OC) vs 3090 in leaked benchmarks
14:40 Will I stick with my 850W PSU?