Is there any problem for getting an ovekill PSU other than efficiency?

[MKSanic]

title says it all

[Letgomyleghoe.]

Price

[D13H4RD]

Your wallet 

 

As far as I know, in terms of safety, as long as the PSU is of good quality, there isn't any harm in that regard for using a high wattage PSU as it will only draw as much power as the components need. 

 

However, as mentioned before, depending on the components and the PSU's efficiency curve, it may operate outside its area of peak efficiency. And there's also the obvious cost downside since you're paying a lot for a PSU that you may not be taking much advantage of. 

 

Very high wattage PSUs make the most sense in mid-high tier workstations, often with multiple GPUs as their power draw would mean that a higher wattage PSU makes sense. Most consumer systems don't draw nearly as much. Though people like me went slightly overkill on their PSU because they would then operate at their peak efficiency under load. 

[GloriousPain]

Price and Lowered efficiency. Are the big ones others have mentioned...

 

Another thing to consider is odd wearing? Like most modern PSUs don't turn their fans on unless they hit X% usage or X temp... and some of the components internally might hit a relatively high temp without it being enough to trigger the fans. and it may just use these parts more than others and cause them to wear quicker than the rest.

 

But that's mostly just in theory. Probably not anything to worry about. 

 

Honestly if I were you I'd just get the PSU wattage that makes sense efficiency wise, and spend the extra money on a nicer PSU or a UPS maybe; which could also help with efficiency and other power delivery.

[seon123]

Certainly not the efficiency. The efficiency "curve" for a mid-high end PSU resembles two straight lines. A nearly vertical one, and then a neary horizontal one.

 

By going for overkill wattage, you may go down in PSU performance. E.g. going for an EVGA N1 750W, an absolutely garbage tier PSU instead of getting a CX450, a pretty decent budget PSU.

 

In case the PSU brand cheaped out on the protections and went for a single rail PSU (e.g. EVGA T2, Seasonic Prime, Corsair RMx), it will be less safe, as the OCP and OPP tripping points will be higher. This is not an issue with multi rail PSUs.

 

In some cases, more noise. You may go for a louder, lower end model, which is noisier, or the model you choose might just be louder. E.g. the EVGA G3 1000W is a lot louder than the G3 550W at the same loads.