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why some graphic card require very low watts ?

Asus AMD/ATI R7 260X Direct CUII 2GB DDR5 Graphics Card
which require only 150 W

and "Gainward NVIDIA GeForce GTX 650 Ti 1 GB GDDR5 Graphics Card"
require 400 W PSU

why so much difference even tho first card is more powerful ?
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  1. Best answer
    In the first they are talking about the cards power requirements, in the secound they are indicating the 'system' needs PSU wise which include a typical CPU, mobo, drives, etc
  2. The 650ti is a generation older, when Nvidia's gpu cores weren't as power efficient
  3. I wouldn't say that the 260 is better. In fact I'd say the were more on par with each other and depending on the function the 650ti might be better.

    The 400w on the 650 is recommended minimum power to power your entire system. The TDP is actually 110w.
  4. As things go tho, the more powerful the card the more power they draw. In newer cards Nvidia cards are more power efficient then AMD cards.
  5. The 260X is slightly better overall
  6. Tradesman1 said:
    In the first they are talking about the cards power requirements, in the secound they are indicating the 'system' needs PSU wise which include a typical CPU, mobo, drives, etc


    This also: the 650 by itself doesn't use 400W. The AMD card probably requires more than 150W system power so this doesn't seem like an apples to apples comparison here.

    They actually have a similar TDP - 115W for R7 260 and 110W for 650ti
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