What happens when my PSU doesn't have enough watts?

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HyperBeastFlashy

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Jul 20, 2015
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So guys! I am going to get the GTX 750Ti and my friend said I need a better PSU. Currently I have 400 watts. So do I need to buy a new better one or not? I would like to play GTA V, the GTX 750Ti uses 60 watts and probably (correct me if I am wrong) it will use more when I play games.

This is my PSU currently:
Frontier L-8400BTX 400W (12A i 14A on +12V rails),
Voltage: 230 V
Current: 10 A 6 A
FREQUENCY: 60 Hz - 50 Hz

So guys please help me! I know that a good PSU will just turn my PC off and a bad one will melt and take my parts with it!

If I need a new one suggest some cheap but good ones! THANKS!
 
Solution
spdragoo
Depends on the 750Ti model & the quality of your PSU. The base 750Ti models don't have a separate PCIe power connector (6- or 8-pin), so they're supposed to work with a 300W PSU; theoretically, then, even a lower-quality 400W PSU should provide enough power.

Usually, though, one of 2 things happens if your PSU isn't quite enough:
-- if it's just on the edge (i.e. you're pulling 95% or so of its actual output), you might experience core slowdowns on your CPU (essentially moving into power-saving mode), which will cut performance.
-- if it's just not able to provide the power, it won't even POST, so you'll have a black screen.
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MisterJef

MisterJef

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Sep 25, 2014
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Hi,

It depends on different cards but most of the cards need a good amount of power to boot up and be available. Under full load your PC can crash and give you errors.

I would suggest a 550 or 600W PSU from Corsair.
 
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spdragoo

spdragoo

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Ambassador
Oct 17, 2011
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Depends on the 750Ti model & the quality of your PSU. The base 750Ti models don't have a separate PCIe power connector (6- or 8-pin), so they're supposed to work with a 300W PSU; theoretically, then, even a lower-quality 400W PSU should provide enough power.

Usually, though, one of 2 things happens if your PSU isn't quite enough:
-- if it's just on the edge (i.e. you're pulling 95% or so of its actual output), you might experience core slowdowns on your CPU (essentially moving into power-saving mode), which will cut performance.
-- if it's just not able to provide the power, it won't even POST, so you'll have a black screen.
 
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