Protection Features
Desktop power supply units (PSUs) include several protection features to safeguard both the PSU itself and the connected PC components (motherboard, CPU, GPU, drives, etc.). These protections prevent damage from electrical faults, overloads, or abnormal conditions.
| OCP (Normal @ 29.8°C) | 12V: 82.80A (132.48%), 11.924V 5V: 31.1A (155.50%), 4.987V 3.3V: 29.5A (147.50%), 3.292V 5VSB: 5.2A (173.33%), 5.003V |
| OCP (Hot @ 42.5°C) | 12V: 81.20A (129.92%), 11.916V 5V: 31A (155.00%), 4.988V 3.3V: 29.2A (146.00%), 3.294V 5VSB: 5.2A (173.33%), 4.999V |
| OPP (Normal @ 27.9°C) | 981.94W (130.93%) |
| OPP (Hot @ 44.9°C) | 952.94W (127.06%) |
| OTP | ✓ (70°C @ Heat Sink) |
| SCP | 12V to Earth: ✓ 5V to Earth: ✓ 3.3V to Earth: ✓ 5VSB to Earth: ✓ |
| PWR_OK | Proper Operation |
| UVP (Full Load @ 90V) | ✓ |
| UVP (No Damage @ 80V) | ✓ |
| Conducted Emissions EN55032 & CISPR 32 | ✓ |
| NLO | ✓ |
| Fan Failure Protection | ✗ |
| SIP | Surge: MOV Inrush: NTC & Bypass Relay |
There is a difference in the 12V rail’s OCP triggering points between normal and high operating temperatures, which ideally should be larger. On the minor rails, the story is entirely different, with sky-high OCP triggering points and minor differences between normal and high temperatures; hence, the offered protection is not at the levels it should be.
The over power protection is conservatively set so that I won’t mind the relatively low difference between high and standard operating temperatures.
The remaining protection features are present except for fan failure, which should be implemented.
EMC Pre-Compliance at a Glance
Every electronic device, including PSUs, can be an EMI source, and the amount of EMI it emits can affect the proper operation of nearby devices. EMI can, in some extreme cases, even render them unusable. Some standards have been established to minimize electromagnetic interference (EMI) noise. The corresponding standards for IT (Information Technology) products are CISPR 32 and its derivative, EN 55032, which applies to products sold in the EU. In the EU, every product bearing the “CE” marking must comply with the EN 55032 standard. CISPR 32 and EN 55032 standards categorize devices into two classes: A and B. Class B equipment is intended for domestic environments. Hence, its permitted EMI emissions are significantly lower than those of A-class devices.
Our equipment for EMI readings:
- TBMR-110M EMI-Analyzer DC-110 MHz
- Tekbox TBLC08 LISN
- Tekbox TBFL1 transient limiter
- Tekbox EMCview software
| CISPR 32 / EN55032 Limits | ||
| CISRP 32 / EN 55032 Class A Conducted EMI Limit | ||
| Frequency of Emission (MHz) | Conducted Limit (dBuV) | |
| Quasi-peak | Average | |
| 0.15 – 0.50 | 79 | 66 |
| 0.50 – 30.0 | 73 | 60 |
| CISPR 32 / EN 55032 Class B Conducted EMI Limit | ||
| Frequency of Emission (MHz) | Conducted Limit (dBuV) | |
| Quasi-peak | Average | |
| 0.15 – 0.50 | 66 – 56 | 56 – 46 |
| 0.50 – 5.00 | 56 | 46 |
| 5.00 – 30.00 | 60 | 50 |
| CISRP 32 / EN 55032 Class A 10-Meter Radiated EMI Limit | ||
| Frequency of Emission (MHz) | Field Strength Limit (dBuV/m) | |
| 30 – 88 | 39 | |
| 88 – 216 | 43.5 | |
| 216 – 960 | 46.5 | |
| > 960 | 49.5 | |
| CISRP 32 / EN 55032 Class B 3-Meter Radiated EMI Limit | ||
| Frequency of Emission (MHz) | Field Strength Limit (dBuV/m) | |
| 30 – 88 | 40 | |
| 88 – 216 | 43.5 | |
| 216 – 960 | 46.0 | |
| > 960 | 54.0 | |
Please note that the ATX spec allows a 4 dB margin for conducted and radiated emissions. This means that if a PSU exceeds the limits but stays within the 4 dB margin, it meets the corresponding ATX spec requirement (8.1 Emissions).
EMI Results
 |
 |
The PSU’s EMI emissions are under control. The QP detector showed some high signals at lower frequencies that do not exceed the corresponding limits.
I would love to see the FSP Mega Ti next up 🙏
Waiting ages for a good honest review.
will try to do it at some time. Sorry being over my head with other things lately.
hello Aris did this PSU legit certified by cybenetics ? https://vsptech.vn/bo-nguon-sfx-vsp-vgf850-cybenetics-gold-850w-atx31-pci-e51-fully-modular.html
i also asking how about this product, did this also had same legit cybenetics certificate https://www.kissquiet.com.tw/copy_productdetail_162651.html?pid=5889399&_t=1761816168
You always praised Corsair for fan failure protection yet with this new shift line they don’t have it anymore you say. Also other protections are not to your liking either. I dislike Corsair because how they treat things so if there is a similar alternative then i chose that.
I think the Pure Power 13 M is a good alternative based on your test and a newly released Dark Power 14 too which also performed well in your tests just no review up yet.
Your test method for Inrush current is different now as you noted, the numbers are different, what threshold would you call good result?
Most PSUs nowadays still don’t have fan failure protection, I am afraid. This is why I am pushing so much through reviews to force them to implement it.
Below 100A is generally considered safe/ok.