LEPA B Series 850W Power Supply Review

For those of you that do not know, LEPA is what we would call Enermax' low cost "house brand" of PSU. No, it specifications are not up to those of most worthy Enermax units, but then again, neither is the price. How does LEPA do with its second unit reviewed here at HardOCP?


Enermax Technology Corporation is a company that is well known in the world of power supplies and general computing alike. Founded in 1990 Enermax has made a name for itself by providing solid performing power supplies, among other computer components, and accessories. Enermax' current lines of power supplies encompass a wide range of products targeted at various market segments including the Liberty ECO, Infiniti DXX, Galaxy EVO, ECO80+, MODU82+, Revolution85+, and PRO82+ series. In addition to being a retail presence with its Enermax brand power supplies, Enermax Technology Corporation appears to be one of the few real OEM designers of power supplies. Its power supplies however, have only rarely shown up under other labels including Grow Up Japan, Sapphire, and its house brand LEPA. Today we are looking at our second power supply from Enermax’ house brand LEPA with this 850W model (B850-MA). Unlike the previous G700 that we reviewed the B850 is not built by Enermax but rather Sirfa.

Sirfa Electronics Co., Ltd. is a name that is not that familiar to most users but they have been around since 1996 when Sirtec established Sirfa as a factory in the Sirtec group on mainland China. Recently, June 2008, Sirtec sold off their interest in Sirfa making the company independent of the Sirtec brand. As such, while we have not seen any Sirfa produced power supplies under the Sirfa brand, some of the Sirtec units of the past were most likely produced at the Sirfa facility. However, Sirfa built units have been seen recently from OCZ, Enermax, and others.

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"B" Series, but Does it Play Second Fiddle?

Today, the LEPA B850 will be the second power supply we have seen from Enermax’ low cost house brand LEPA. Like with the previous G700, this is not exactly the first time we have seen this type of design from Sirfa as this type of design served Enermax previously in 750W dress as the NAXN 750W. Obviously, that unit was another low cost but not Enermax built unit and it performed decently in our testing. With this in mind, we have some results to compare this units results with to today in regards to similar designs used by Enermax and, of course, other 850W units on the market in general. Before moving on to our load testing, let’s see what Enermax expects us to see with the LEPA B850 today:

82 PLUSآ® Bronze certified with peak 88% efficiency

13.5cm fan with intelligent RPM control guarantees cool performance and silent operation

Active PFC universal switching circuit improves Power Factor value up to 0.99, reducing AC line reactive power loss to minimum level and automatically adopting AC voltage from 100~240V.

8P PCI-E connector supplied supporting extreme graphic cards.

Protected by Over Power, Over Voltage, Over Current, Short-Circuit, and Brown Out protections circuits.

CPU 12V connector rail with ﹥18A output to support next generation ﹥6 cores processor structure.

Extending CPU connector cable to 60cm facilitates installation with bottom-mounted-PSU chassis.

SATA power connector with 3.3V rail to support new generation SSD.

Modular design for easy cable management and flexible system upgrade support

Let’s now move on to see what to expect when we purchase the LEPA B850 in terms of documentation, accessories, cable count, rail layout, output characteristics, and general build quality.