My current EVGA GTX 1070 FTW with an overclock of 2.04Ghz on core clock and 4.4 Ghz on memory uses ~ 223 watts under full load. This is a card with 1920 cuda cores, no ray tracing or other exciting technologies.
According to NVIDIA, the GTX 1070 should draw 150 watts of power.
The RTX 3080 would have 8704 cuda cores, well I know it turns out that not all of these cores are not dedicated, but in the case of gaming, as far as I understood you should assume that you can use all 8704 for this. .
I built my current PC with a 750 watt power supply, an i9 9900k @ 5.1 ghz and assumed that if I upgraded my GPU it would draw more than 400-450 watts of power after an overclock. I also think that the official 320 watts compared to my current ~ 220 watts for my GTX 1070 are not that bad.
Perhaps with an aftermarket card from EVGA and a considerable overclock with an RTX 3080 I can draw about 400-430 watts, but that is still ‘only’ 2x the power consumption of my GTX 1070, while in theory you can 4.5x the performance.
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