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PSU Chieftec BPS-750C2 (Nitro 2 Series) Review

Chieftec, a renowned PSU designer, developed and released its Nitro 2 series of power supply units a few years ago. Last year the series replenished with new models and nowadays it consists of nine units with 400W-850W power. All of them have managed to gain 80 Plus Bronze certificate, due to a high efficiency level 81-85-81 at 20%, 50% and 100% power loading correspondingly. Chieftec BPS-750C2 unit is a deserving representative of Nitro 2 series that attracts clients not only by its facilities but also by a democratic price.

Design and Delivery Kit

Chieftec BPS-750C2 is housed in a black casing with a rough texture. Black ventilation grid with the company's logo in the center covers the integrated cooling system fan. Network socket on the external side is supplemented with a switch; internal side accommodates four sockets for the connection of cables that provide power to peripheral devices, and two more sockets for the graphics cards power supply. Each socket is distinguished by a separate color and caption, so the user will have zero chances of confusing them. This unit is equipped with an active PFC and might operate at wide input voltage limits (from 110V to 240V). Besides, it supports various security technologies that minimize the unit's collapse.

Nominal delivery set consists of a user's guideline, demountable cables, a network cable, mounting screws, and a velor case for the unused loops. The main motherboard power loop is non-removable, similar to a couple of 60 mm cables with EPS12V (4+4) sockets for CPU power supply. The list of other available cables includes: a single cable with two connectors for IDE devices, a single cable with two connectors for IDE devices and one FDD, a pair of cables with two 8-contact connectors for PCI Express graphics cards, and a pair of cables with four power connectors for SATA devices. Such delivery kit is supposed to be sufficient for the organization of a powerful PC gaming system, while the second loop might appear to be useless.

General Specifications

Power supply unit from Chieftec features quite updated for this industry specifications. Therefore, it has got a single +12V rail (62A) and is capable to manage up to 744W power loading that approximates the claimed nominal index. The combined power registered on +3.3V and +5V rails equals to 130W; this will be enough for the delivery of power to a rather efficient PC system.

Internal Framework

Chieftec BPS-750C2 hides a large amount of internal components and a minimal amount of heatsinks for the power elements cooling-off. The heatsinks themselves are usual aluminum plates without any additional ribs for better heat dissipation activity. The only exception is diode bridges' cooler that ends up with five ribs.

High-voltage section is represented by two key transistors and APFC elements which are governed by a PWM controller CM6800 (Champion Microelectronics) and cooled down by a heatsink located near the pulse transformer. Secondary circuit has undergone major changes: Chieftec has implemented a high-efficiency synchronous rectifier on transistors for the main +12V rail instead of Schottky diodes. Its components are located on a separate circuit board and are monitored by a thermal sensor. Low-voltage section consists of independent DC-DC converters that are governed by APW7159 controller. Stable PSU operation is ensured by polymer capacitors, while +12V voltage is organized via quite thick conductors.

Maintenance of optimal thermal conditions is assigned to the integrated 140 mm fan, codenamed D14BH-12 (Yate Loon Electronics). Its utmost rotational speed is recorded at 2800 RPM at two-wire connection. The fan's edge is covered by a plate to provide for a more even cooling; this plate directs the airflow to the internal part of the unit.

One more thing is the noise level. This PSU model can't be characterized as a silent product. In standby and idle mode the user won't probably differentiate its sounding from the background noise. Nonetheless, on heightened loading, the noise level might appear to be a bit bothersome.
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  • 28 January 2013, 13:43
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