Protection Features
| OCP (Normal @ 28.6°C) | 12V: 58.30A (127.29%), 12.078V 5V: 29.4A (147.00%), 5.022V 3.3V: 29.2A (146.00%), 3.295V 5VSB: 4.3A (143.33%), 5.029V |
| OCP (Hot @ 41.3°C) | 12V: 54.00A (117.90%), 12.090V 5V: 28A (140.00%), 5.022V 3.3V: 29.3A (146.50%), 3.293V 5VSB: 4.3A (143.33%), 5.027V |
| OPP (Normal @ 28.7°C) | 692.59W (125.93%) |
| OPP (Hot @ 40.9°C) | 683.02W (124.18%) |
| OTP | ✓ (151°C @ Heat Sink) |
| SCP | 12V to Earth: ✓ 5V to Earth: ✓ 3.3V to Earth: ✓ 5VSB to Earth: ✓ -12V to Earth: ✓ |
| PWR_OK | Proper Operation |
| NLO | ✓ |
| Fan Failure Protection | ✗ |
| Conducted Emissions EN55032 & CISPR 32 | ✓ |
| UVP (Full Load @ 90V) | ✓ |
| UVP (No Damage @ 80V) | ✓ |
| SIP | Surge: MOV Inrush: NTC & Bypass Relay |
The 12V rail’s OCP triggering points are conservatively set despite the unit’s relatively low capacity. The 5V rail’s OCP is correctly set since there is a difference (not that high, though) between normal and high operating temperatures. I won’t whine about the high OCP triggering point at 5V, because the VRMs can handle this load, and modern systems can heavily utilize this rail.
On the other hand, there is no need for high amperage at 3.3V, and to make matters worse for this PSU, the hot OCP triggering point is set higher than the one at normal temperatures, while it should be the other way around. This means no award will be given to this product, regardless of its overall performance.
The over power protection is not set too high, but I would like to see a larger difference between normal and high operating temperatures. Lastly, the rest of the essential protection features are present except for fan failure, which needs to become popular in PSUs.
EMC Pre-Compliance at a Glance
Every electronics device, including PSUs, can be an EMI source, which, depending on the amount of EMI emitted, 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:
- Rohde & Schwarz FPC1500 (loaded with all options)
- 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 conducted EMI emissions are under control, as shown in the graph above.
Are you willing to evaluate the lowest category Be Quiet series as well? Most notably the brand new System Power 11 series? It has 450W and 550W members, and it is the cheapest Be Quiet PSU on the market. A lot of people are buying them, without knowing how dangerous (or safe?) they are, after the System Power 10 test turned out that they are not that terrible, contrary to the tribal knowledge (System Power 10 Bronze series has been downgraded to Tier E on the SPL PSU Tier list).
If they send them to me sure. SP used to be pretty good for their money.
Can you ask them?
Typo: All links on first page lead to 550W models except for the first one with 1000W.
thanks! fixed