Efficiency Normal, Light & Super-Light Loads
Efficiency in power supplies refers to the percentage of input AC power that is converted into usable DC power for the system, with the rest lost as heat. For example, an 80% efficient PSU delivering 400W of DC power draws 500W from the AC source, losing 100W as heat.
Compared to similar Wattage units, efficiency is not competitive across all efficiency ranges except for the 2% load.
Average Efficiency
The PSU’s average efficiency with more than 1450 different load levels at 115V and 230V is depicted in the graphs below.
The average efficiency meets the Cybenetics Gold criteria.
Average PF
Power factor in power supplies is the ratio of real power (used to do work, measured in watts) to apparent power (total power drawn, measured in volt-amperes). It indicates how efficiently a PSU uses incoming AC power. A higher power factor (closer to 1) is better, as it means less wasted energy, reduced strain on electrical systems, and improved efficiency, often achieved through Active Power Factor Correction (APFC) in modern PSUs.
The APFC converter offers good performance.
Average Efficiency 5VSB
The 5VSB rail’s efficiency is high.
Vampire Power
Vampire power, also known as standby power, refers to the electricity consumed by a power supply unit (PSU) when it is plugged in but not actively powering a device, such as when a computer is turned off or in a low-power state, like sleep mode. This small, continuous draw (often a few watts) occurs due to background functions, such as maintaining standby rails (e.g., +5VSB for wake-on-LAN). Lower vampire power is better, as it reduces energy waste and lowers electricity costs.
Vampire power is below 0.1W at 115V, but notably above this threshold at 230V.
Hello which PSU would you recommend if you had to pick from : Chieftec VEGA M PPG-750-C, Corsair RMe Series RM750e , Cooler Master MWE Gold V2 ATX 3.1 750W. They are priced the same and I am looking for a PSU to pair with my 5070 TI…
I would get the one with the better support in the region, because performance differences are not that dramatic among these. Check for their noise output also (average noise) output.
I’m curious how worried should I be for the inrush current this model has. It is quite competitively priced where I live, and I’m inclined to get it if it is not a big deal in terms of long-term reliability or safety on the secondary side.
We changed inrush current testing methodology because there were issues with the previous one. This is most likely ok.
Thank you, Aris!
As I see, the inrush is similar on Cybenetics as well. There is also an option to have the Cougar GEX Pro (650W which is not rated at Cyben) for similar price as well. Although Chieftec’s Vega M seems more reviewed than the Cougar. Which one would you recommend?
PS – It is amazing to get guidance from professionals like you!
Just retested the Chieftec PSU for inrush current, as expected values are way lower. I cannot say about the GEX Pro 650 since I haven’t tested it or at least I don’t remember doing so, my team 🙂
Thank you for your guidance and updated information! I do not have any second thoughts about the Chieftec then! 🙂
Hi
I found one Iranian PSU “GP800A-UK EVO V3.1” https://green.ir/products/power-supply/gp800a-uk-evo-v3.1 and it’s powered by High power No-832H , similar to Chieftec VEGA’s board but it’s High power No-832D.
Is there any PSU that uses No-832H ? Is it higher tier?
This is high quality image : https://green.ir/assets/filemanager/userfiles/green/PSU/UK-EVO-V3.1-Series/Gallery/GP800A-UK-EVO-V3.1/GREEN-GP800A-UK-EVO-V3.1-PSU-G-11.jpg