| Antec Signature 650 Power Supply Review |
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Real-time pricing for XFX P1-750B-NLG9 |
| XFX P1750BNLG9 Pro Series XXX Edition ATX Semi-Modular Power Supply 750W 80 Plus Silver 135mm Fan Active PFC |
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| Overload Tests |
 Before overloading power supplies we always test first if the over current protection (OCP) circuit is active and at what level it is configured. In order to do that we configured our load tester with a low (1 A) current on its +12V1 input and increased current at +12V2 (which was connected to the power supply +12V2 rail) until the power supply shut down. This happened when we tried to pull 30 A or more from +12V2. Even though OCP was clearly active, we think that it was configured at a value that is little bit high, since the label states a 22 A limit for +12V2 rail. Over power protection (OPP or OLP) was active, which is terrific. So we maxed out all the power supplies outputs until it shut down. The values we could pull from this unit with it still working you can see below. Input | Maximum | +12V1 | 29 A (348 W) | +12V2 | 29 A (348 W) | +5V | 19 A (95 W) | +3.3 V | 19 A (62.7 W) | +5VSB | 3 A (15 W) | -12 V | 0.5 A (6 W) | Total | 868.4 W | % Max Load | 133.6% | Room Temp. | 47.5º C | PSU Temp. | 51.9º C | AC Power (1) | 1,038 W | Efficiency (1) | 83.6% | | AC Power (2) | 1,084.0 W | | Efficiency (2) | 80.1% | | AC Voltage | 99.5 V | | Power Factor | 0.998 |
As you can see we could pull practically 870 W from this power supply at a room temperature between 45º C and 50º C and it was working perfectly with very low noise levels (33 mV maximum at +12V1) and efficiency still above 80%. Really amazing.
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Ultra LSP750 750-Watt Power Supply ATX SATA-Ready SLI-Ready 135mm Fan Lifetime Warranty w/ Registration
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