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Question about Power Supplies and Heat
If I get a larger power supply... say 450w instead of 350w... does
that itself create significantly more heat? Or is the heat generated solely dependent on the amount of power required/consumed by the components? Thanks, Thunder9 |
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If I get a larger power supply... say 450w instead of 350w... does that itself create significantly more heat? Or is the heat generated solely dependent on the amount of power required/consumed by the components? Thanks, Thunder9 On the same box I found a 400W PS put out way more heat than a 200W PS that I have in it now. It has a Barton 2500+ @ 3200+. ------------ When your PC gives a little they give a lot. http://www.dslreports.com/forum/disco |
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#5
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Thunder9 wrote:
If I get a larger power supply... say 450w instead of 350w... does that itself create significantly more heat? No. Or is the heat generated solely dependent on the amount of power required/consumed by the components? Yes. |
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On Mon, 15 Sep 2003 22:49:25 -0700, ric wrote:
Thunder9 wrote: If I get a larger power supply... say 450w instead of 350w... does that itself create significantly more heat? No. Or is the heat generated solely dependent on the amount of power required/consumed by the components? Yes. Ok I did some research and, as other posters also indicated, this is incorrect. The heat generated /* by the power supply */ is due to its efficiency. Thus if the PSU was 100% efficient at converting power from ac to dc (which none are) then the psu would produce no heat. If the power supply was 50% efficient, then it would take, for example, 300 watts of power to produce 150 watts of usable energy, and that extra 150 watts would be converted into heat at the PSU. For an excellent artical on this, check out... http://www.silentpcreview.com/module...rtid=28&page=1 Regards, Thunder9 |
#7
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Efficiency is not constant. The efficiency number changes
with load. Typically, it does not change much. But it does change. Thunder9 wrote: Ok I did some research and, as other posters also indicated, this is incorrect. The heat generated /* by the power supply */ is due to its efficiency. Thus if the PSU was 100% efficient at converting power from ac to dc (which none are) then the psu would produce no heat. If the power supply was 50% efficient, then it would take, for example, 300 watts of power to produce 150 watts of usable energy, and that extra 150 watts would be converted into heat at the PSU. For an excellent artical on this, check out... http://www.silentpcreview.com/module...rtid=28&page=1 Regards, Thunder9 |
#8
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"Thunder9" wrote: Ok I did some research and, as other posters also indicated, this is incorrect. The heat generated /* by the power supply */ is due to its efficiency. Thus if the PSU was 100% efficient at converting power from ac to dc (which none are) then the psu would produce no heat. If the power supply was 50% efficient, then it would take, for example, 300 watts of power to produce 150 watts of usable energy, and that extra 150 watts would be converted into heat at the PSU. For an excellent artical on this, check out... http://www.silentpcreview.com/module...rtid=28&page=1 Be aware that voltage regulation reduces the efficiency of a power supply while increasing its stability and cleanliness of output. Judging a power supply soley by its efficiency would be a mistake (not that you've done that). *TimDaniels* |
#9
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Thunder9 wrote:
If I get a larger power supply... say 450w instead of 350w... does that itself create significantly more heat? No. Or is the heat generated solely dependent on the amount of power required/consumed by the components? Yes. Ok I did some research and, as other posters also indicated, this is incorrect. The heat generated /* by the power supply */ is due to its efficiency. Thus if the PSU was 100% efficient at converting power from ac to dc (which none are) then the psu would produce no heat. If the power supply was 50% efficient, then it would take, for example, 300 watts of power to produce 150 watts of usable energy, and that extra 150 watts would be converted into heat at the PSU. Your point being? A 250 watt PSU outputting 200 watts at 70% efficiency would have an input of 200/.7 watts or 285.7 watts. The extra 85.7 watts would be dissipated mainly as heat. A 450 watt PSU outputting the same 200 watts at 70% efficiency would have the same input of 285.7 watts, with the same 85.7 watts again being dissipated mainly as heat. If anything, the 450 watt PSU would have it's output rectifiers and magnetics running at a lower percentage of their full rating, thereby running cooler. [PSU efficiency *is* affected greatly by how much power it's components dissipate, after all. That is the #1 factor determining PSU efficiency.] Nothing in the article at the URL you gave indicates otherwise. |
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