Noob question about buying PSU's

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pad120

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Hey guys, I am relativity new to the PC building scene and this question may seem silly but I was looking to get this right.

My question basically is, when it comes to buying a PSU is more watts always better or can too many watts be a bad thing for your PC?

For example, my current built is recommended a 750W power supply,would getting an 1000W or 1200W cause problems in any way?

I have looked up information about the right brands, 12v and such but this I haven't come across.

Thanks everyone.
 
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Even a if there is a 10000w Psu, still it will not cause any problem, coz psu only provides the required or desired amount of electricity to your hardware,
Suppose your rig requires 450w and you have 1200w, so the psu will only pass 450w out of 1200w.
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Darkbreeze

Darkbreeze

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Getting a unit with more capacity doesn't offer any benefit beyond not having to buy it again later if you upgrade to hardware that requires a larger capacity unit, AND, more importantly, allowing your PSU to not ever have to run at or near it's full capacity, which allows it to operate in a lower thermal range and is actually beneficial.

Also, this: http://www.jonnyguru.com/modules.php?name=NDFAQs&op=FAQ_Question&ndfaq_id=3

As far as getting a QUALITY unit, keep in mind that 80 plus ratings, brand name and capacity (WATTS) have very little to do with it.

The best way to get a good unit is to buy one with excellent professional reviews from a good testing lab, which is exactly what has been ranked for you at the following link. You'll want a Tier 1 or Tier 2 unit if you plan to use a gaming card or overclock. If you'll be running a mainstream machine with no gaming cards or overclocking, a tier 3 unit MIGHT be good enough, but getting at least a tier 2 unit would still be a good idea.

Dottorent's PSU tier list:

http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html#15349669
 
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mrt3

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Even a if there is a 10000w Psu, still it will not cause any problem, coz psu only provides the required or desired amount of electricity to your hardware,
Suppose your rig requires 450w and you have 1200w, so the psu will only pass 450w out of 1200w.
 
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Ra_V_en

Ra_V_en

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:sarcastic:

Obviously there are drawbacks of larger PSU's
1) You have to pay more for it
2) Efficiency might be lower since its not linear especially on very low power draw
3) Your wall/electric installation might not like to hundreds of Ampers inrush current while charging huge primary CAP's

So yeah 10kW...duh get back to school on a Physics lessons.
 
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mrt3

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Actually i'm always failed in physics :pt1cable:
 
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Darkbreeze

Darkbreeze

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However, a 1000w PSU might still be using less actual power running at 40% of capacity, even with a lower efficiency, than a high efficiency unit of only 650-750w listed capacity, and is likely to last a lot longer than one that's running at or near capacity all the time, due to a much lower thermal operational status.

That's not to say I recommend using a 1000w unit for a system that only needs 650w on paper and probably only pulls 500w from the socket. Just that it isn't going to hurt anything and if there is potential for an upgrade later that may require a major increase in capacity, like a Crossfire or SLI configuration, then it makes sense to only buy it once.

That being said, it's also absolutely true that most Tier 1 and Tier 2 650w units are more reliable, more likely to actually put out the power rated on the label and far more likely to make it to or beyond the end of their warranty period, than any Tier 3 or lower unit ever will be.
 
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