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How many Watts do I really need for my PSU?

Last response: in Graphics & Displays
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August 2, 2013 10:39:33 PM

I have an i3 3245 on an H77 motherboard with a HD 7770. Some sources say the minumum PSU I need is 500 watts for a 7770. Others say that 350 watts is enough.

How exactly do I calculate this? People tell me you can't just add up the Watts.

More about : watts psu

a b V Motherboard
August 2, 2013 10:47:01 PM

500w for that system is overkill.
A GOOD 350w PSU (Like an Antec Earthwatts 380w) would be enough
Or a Corsair CX430 would be good.

Food for thought: My system Core 2 Duo + 6670 draws 150w at the wall under full load.
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August 2, 2013 10:54:57 PM

quicksand10 said:
^+1

The Corsair CX430 is an excellent choice
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

If you're looking for a cleaner case, opt for the modular version:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


Oh I forgot to mention that it was for a micro-ITX case that only holds SFX form factor PSUs. So 450w is as high as they make them. I wonder if I can fit a better card in for 450w

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

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a b V Motherboard
August 2, 2013 11:13:50 PM
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Ah, okay then.

I'd suggest the fully modular, 80PLUS Gold rated version of the PSU you posted.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Here are some reviews for both models:
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

In a tiny case, you want good airflow, and a fully modular, efficient PSU is helpful for maximizing airflow and thus keeping temperatures and noise levels to a minimum.
August 2, 2013 11:16:09 PM

quicksand10 said:
Ah, okay then.

I'd suggest the fully modular, 80PLUS Gold rated version of the PSU you posted.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Here are some reviews for both models:
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...

In a tiny case, you want good airflow, and a fully modular, efficient PSU is helpful for maximizing airflow and thus keeping temperatures and noise levels to a minimum.


Do you think I could put in a better graphics card for that PSU?
a b V Motherboard
August 2, 2013 11:26:27 PM

You could probably go up to a 7850 with no problems
!