High Power Power Supply

Solution
High Power isn't bad, pretty mediocre.

The 20/50/100 is an efficiency table for 80+. It just shows you what the efficiency is at those load %. And that's all. Being a Bronze rated unit, it's just more efficient than most of the other HP units, which run at 80+ instead of 80+Bronze. You'd need to move upto a HP 850w to get 80+Gold rating.
High Power isn't bad, pretty mediocre.

The 20/50/100 is an efficiency table for 80+. It just shows you what the efficiency is at those load %. And that's all. Being a Bronze rated unit, it's just more efficient than most of the other HP units, which run at 80+ instead of 80+Bronze. You'd need to move upto a HP 850w to get 80+Gold rating.
 
Solution
I would not use it with such costly components.
As for numbers on the chart, those are efficiency on given load. So you got 83.60% efficiency at 20% load, 85.47% efficiency at 50% load, and 82.38% efficiency at full load. Those numbers does not matter much unless you are really worried about your electricity bills.
 
I saw your other thread, as for the brand, i have never heard of it. There may be some reviews if you google the brand. if it is on the psu tier list on the forum that might give you an idea. the most important thing for a power supply is the current it can supply, since it has an 80+ rating that is nice - it means they got it tested to meet standard requirements. the label on the side for a 600w supply should read the current for a single 12v rail to be around 50A, as low as 40 and I wouldn't worry too much for within the warranty period, for two rails if its any lower than ~23 and is less then 45A between the two its not looking too great.
 


I would upgrade to something better since you are using really expensive components with a below average psu.
 
80 Plus 80%80%80%
80 Plus Bronze 82%85%82%
80 Plus Silver 85%88%85%
80 Plus Gold 87%90%87%
80 Plus Platinum 90%92%89%
80 Plus Titanium 90%92%94%90%

All units are certified (not standardized as 80+ is a voluntary certification, not an actual standard) at 20%, 50%, 100% loads except for Titanium which is also certified under 10% loads as well.

HighPower is Sirfa/Sirtec brand, a rather large OEM and solidly mediocre, neither great nor trash worthy.
 
I have a CyberPower Standard power supply which is a HPL-800BR-F14S model. I have beeb using this for avout two months.

Can anyone offer any advise on if and when I should replace this for a better model.

There is an interesting review on the CyberPower Facebook page by an Alan Pellington on a Standard power supply problem. I you also look at the comments, you will see that the power supply in question is a "High Power" product. The report can be seen at:

https://www.facebook.com/pg/Cyberpower-146154398762410/reviews/

As a matter of interest, are there any other reports like this one elsewhere on the web?