Is My Math Right?

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happo123

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Jul 8, 2014
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I was hoping someone could confirm my math/assumptions for me.

My PSU has a 12V rail max of 18A for a total maximum supply of 216W. My processor is an Intel i5-3330S with a TDP of 65W. My WD harddrive has a 7.5W active dissipation. I'll assume the rest of my barebones system consumes 30-40W at max. I plan to purchase a Radeon R7 240 with a maximum power consumption of 75W.

At max, the 12V drain should be no more than (65 + 7.5 + ~40 + 75 ~= 188W.

If this math and assumption are correct, my PSU should be able to handle the card.
 
Solution
hunter315
What power supply are you using? Make sure it is rated to a high enough temperature, good ones will be rated to 40 or 50C which will be fine, cheaper ones are often rated at 20 or 25C and lose 1-3W per degree C above their rating so a 300W unit rated at 20C with 3W/C would only be a 240W unit at 40C which is a reasonable temperature for a PC case. Keep this in mind especially if you are going to be running that close to the limit!
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hunter315

hunter315

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May 12, 2009
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What power supply are you using? Make sure it is rated to a high enough temperature, good ones will be rated to 40 or 50C which will be fine, cheaper ones are often rated at 20 or 25C and lose 1-3W per degree C above their rating so a 300W unit rated at 20C with 3W/C would only be a 240W unit at 40C which is a reasonable temperature for a PC case. Keep this in mind especially if you are going to be running that close to the limit!
 
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Solution
smorizio

smorizio

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Jan 22, 2010
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as you did not post the brand and model of the power supply I take a guest that it the stock one. if it is the stock power supply your better off picking up a cosair 430w unit. cheap stock units when loaded t near there rated limit have more often then not popped with a loud bang and smoke...taking the system with them.
https://www.youtube.com/watch?v=KWioBNHwwb4
https://www.youtube.com/watch?v=kj8-wNmYJvM
https://www.youtube.com/watch?v=wK8p7dGSdmo
 
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happo123

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Jul 8, 2014
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Thank you for reminding me about temperature dissipation, it's been a long time since I had to take E&M. The card has been working without problem at an average load of 30-50% and a peak load of 80-90%, though the card does get a little hot. I'll continue to keep an eye on GPU and PSU temperatures for the next few weeks as I test various applications.

 
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