Lepa B-Series 850W - The Leopard Attacks
by Martin Kaffei on December 15, 2011 12:00 PM EST- Posted in
- Cases/Cooling/PSUs
- PSUs
- Lepa
- Enermax
- 850W-950W
Voltage Regulation
| +3.3V Regulation/Ripple and Noise | |
| Load | Voltage |
| 5% | +3.33% (6 mV) |
| 10% | +3.03% (28 mV) |
| 20% | +2.72% (34 mV) |
| 50% | +1.81% (25 mV) |
| 80% | +1.51% (28 mV) |
| 100% | +1.80% (46 mV) |
| 110% | +1.21% (48 mV) |
| Crossload +12V max. | +2.72% |
| Crossload +3.3V/+5V max. | -0.91% |
| +5V Regulation/Ripple and Noise | |
| Load | Voltage |
| 5% | +3.40% (4 mV) |
| 10% | +3.00% (5 mV) |
| 20% | +2.80% (14 mV) |
| 50% | +2.20% (14 mV) |
| 80% | +1.80% (18 mV) |
| 100% | +1.80% (37 mV) |
| 110% | +1.00% (39 mV) |
| Crossload +12V max. | +1.60% |
| Crossload +3.3V/+5V max. | -3.60% |
| +12V Regulation (Worst Rail)/Ripple and Noise (Worst Rail) | |
| Load | Voltage |
| 5% | +2.75% (15 mV) |
| 10% | +2.58% (37 mV) |
| 20% | +2.42% (38 mV) |
| 50% | +2.08% (28 mV) |
| 80% | +1.50% (44 mV) |
| 100% | +1.75% (46 mV) |
| 110% | +1.50% (47 mV) |
| Crossload +12V max. | -0.92% |
| Crossload +3.3V/+5V max. | +1.83% |
Noise Levels
| Loudness | |
| Load | Opinion |
| 5% | low fan noise |
| 10% | low fan noise |
| 20% | low fan noise |
| 50% | low fan noise |
| 80% | fan noise |
| 100% | strong fan noise |
| 110% | strong fan noise |
Efficiency and PFC
| 115VAC. 60Hz | ||
| Load | Efficiency | PFC |
| 5% | 72.84% | 0.670 |
| 10% | 79.58% | 0.688 |
| 20% | 83.09% | 0.823 |
| 50% | 86.21% | 0.906 |
| 80% | 84.75% | 0.922 |
| 100% | 82.80% | 0.945 |
| 110% | 81.10% | 0.948 |
Unsurprisingly the power supply has no problems with both crossload tests. The measured values are not as good as the results from power supplies with DC-to-DC, but the results are great for a PSU in this price class. With a small load the voltages are relatively high while power factor is low. At 20% load both the efficiency and the PF are satisfying. At peak load Lepa reaches more than 86% efficiency, which is quite good for 80 Plus Bronze. It seems that the customer gets everything promised in the product description.
The ripple voltage and noise are moderate; even so, the results could be better. During 100% load the +3.3V ripple was close to the upper limit of the ATX specification. The subjective loudness corresponds to what one would expect from a power supply like this. Under light load the fan rotates as slowly as possible. With 80% load the fan is clearly audible, but since most 850W PSUs are used in high-end PCs the graphics cards needed to hit 80% load (680W output) will in all likelihood be making the lion's share of the system noise.
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13 Comments
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IvanChess - Friday, December 16, 2011 - link
I had to buy a 4" 4+4pin to 4+4pin extender for my power supply when I bought a new case with a bottom mount. Fortunately I can route that cable behind the motherboard tray so you never see it.JonnyDough - Thursday, December 15, 2011 - link
Enermax Liberty PSUs die right after the 3 year mark, almost within a month of each other....I'll be sticking with higher end PSUs, and going for the 80+ gold. For the money, they are well worth it.
Sabresiberian - Friday, December 16, 2011 - link
Others will disagree, and I don't blame them; you could spend double the amount on a high end 850W PSU. Three times the $80 figure.However, when I'm building a rig that requires I use a PSU with this much capacity to supply power, I'm not looking to save money as my first priority; I'm looking to supply the highest quality power to components I'm going to push hard through overclocking. I'm looking to install 2 (at least) high end video cards. My philosophy is that it's worth another $100-$150 to have the best available in that situation.
For a build that's never going to see parts pushed hard and doesn't require more than 600W, I can certainly see saving some money with a budget PSU you have read a decent review of .
I give Lepa large amounts of credit though for producing a PSU that will be attractively priced to builders that may not know better than to judge by anything but price, and still give them a decent PSU. Every good one helps put the bad ones out of business.
;)