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275f to c fan8/13/2023 ![]() ![]() Note that even with a good (bronze+ or silver rated PSU) you are still loosing about 15% during conversion. If your system is not going to change than the 800 Watt PSu is the better choice. That is still within the normally accepted range, but at the low end. The 1200 Watt PSU would run at only 41% of its maximum rating. The 800 Watt PSU would run at 62.5% of max rating. Will there be any tangible difference in the outlet wattage draw between a 1200W power supply vs, say, a a 800W power supply? ![]() Thus if you get a PSU which is ‘just large enough’ or ‘way to big’ it is likely to be less efficient.Ī nice example of areal world efficiency graph is this: How much depends on the quality of your PSU and on how much power you draw from it.Īlmost any PSU is very inefficient when you draw less then 20% of max rated power from it. Almost any PSU has less than peak efficiency when you draw close to the max rated power from it. Almost any PSU has their optimum efficiency around 40% to 60% of maximum load. There is some loss during this conversion. However note that the PSU draws AC power from the wall socket, converts it to some other DC voltages, and provides those to your system. The wattage implies the maximum available wattage to the system. Hennes explains the value of a system-appropriate PSU: I think you 800W supply will be sufficient, but it won’t guarantee you safety. See this link for a summary of 80 PLUS labels.Įxample: If your 1200W supply has a 80 PLUS label on it, it will supply probably 1200W but will consume 1500W. Today however, there are also bronze, silver, gold, platinum power supplies which guarantee a certain amount (minimum of 80%) of efficiency. I always count 60% of the capacity as the truly maximum capacity. However, in practice the supply won’t ever make that. The wattage of your power supply is what it could potentially supply. What is the difference? And what, for that matter, do the 80 Plus designations mean on modern PSUs? The AnswerĬontributors Mixxiphoid and Hennes share some insight into the PSU labeling methods. If I have a system running at ~500W of power draw, will there be any tangible difference in the outlet wattage draw between a 1200W power supply vs, say, a a 800W power supply? Does the wattage only imply the max available wattage to the system? SuperUser reader TK Kocheran is curious about power supplies: ![]()
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