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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Arbie - Thursday, December 15, 2011 - link
Rebate good through 12 Jan.krylon - Thursday, December 15, 2011 - link
http://www.newegg.com/Product/Product.aspx?Item=N8...$40 MIR card
JarredWalton - Thursday, December 15, 2011 - link
Thanks -- updated with additional pricing info.SanLouBlues - Thursday, December 15, 2011 - link
Did your text to speech eat your words? What does this mean? (Bottom of the first page)justaviking - Thursday, December 15, 2011 - link
I was also wondering WHY that comment was made.Are they out of balance?
Are the edges (from plastic injection molding, for example) ragged?
Do they have an uneven finish or surface texture?
And most importantly, is this anything that will affect performance?
Will dust collect on it more than usual, or will it result in more noise, or something like that?
JarredWalton - Thursday, December 15, 2011 - link
I'll be honest, I edit Martin's articles quite heavily since he's not a native English speaker, and I wasn't quite sure what he was referring to here. Hopefully he can respond with additional information. :-)iamkyle - Thursday, December 15, 2011 - link
He is probably referring to the fact that the blades are indeed poorly shapen, or have rough edges. Globe fans are NOT known for their quality.JarredWalton - Thursday, December 15, 2011 - link
That's sort of what I thought, but I didn't want to read too much into it without personally seeing the fan.Martin Kaffei - Friday, December 16, 2011 - link
It's my fault."Rough edges" would be the correct description.
Thanks a lot for your help.
Arbie - Thursday, December 15, 2011 - link
I put a bottom-mounted PSU with a 50cm Main cable in a popular mid-tower case. That cable would barely reach the mobo connection (near the ouput panel).
People have been complaining for years about these cable lengths, with bottom-mount PSUs. It's amazing that the vendor engineers remain clueless. Of course more wire costs more money, but an extra one or two inches would put this supply on a lot more buyer's short lists. As it is, I have to pass on it.