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**B Grade** Formula Series 550W 80 Plus Gold Power Supply
B Grade items may have been used, have damaged packaging, missing accessories or a combination of these.
Some items may have scuff marks or slight scratches but should otherwise be an operable product.
BitFenix describes the Formula series as the little brother of its successful Whisper M series. In fact, the Formula power supplies have almost identical technical features. This begins with modern electronics and the efficiency that goes with that, which results in a particularly low level of waste heat. The 120 mm fan can turn particularly slowly as a result. The specially developed fan control allows operation at just 500 RPM at low to medium load.
The grill design of the fan cover is particularly low resistance and this helps to reduce air turbulence at the air inlet. This means that the air flow is, subjectively speaking, virtually silent at low and medium loads while still (very) quiet at full load. Possible noise from the bearings is avoided over the lifetime of the product by using an encapsulated FDB bearing. In cooler surroundings (up to around 25 degrees room temperature) the Formula 80 Plus Gold produces 18 dB(A) at 60% load.
State-of-the-art technology under the hood of the non-modular power supply unit: In the primary range, BitFenix relies on Active PFC and LLC resonance conversion, in the secondary range, DC-DC down-conversion is used. Unlike many competitors, BitFenix does not have to rely on an existing platform of a contract manufacturer and was instead able to develop its own PCB for the Formula series in order to fully meet the expectations of its customers.
In addition to the particularly high efficiency due to the reduced conversion losses, the main benefit of the numerous optimisation measures is the voltage quality include the fact that due to the independently regulated voltages, the total rated power of 550 watts can be provided on the +12 volt rail for CPU and GPU, something which is vital today. On the so-called minor Rails +3.3 and +5 Volts, up to 100 Watts of load are permissible - sufficient for large amounts of high-end storage and a dozen drives.
Even highly asymmetrical loads do not result in significant deviations of the voltages from the set-points. Intel's new processor generations with the current C6/C7 power saving modes are of course fully supported. High-quality Japanese 105-degree electrolytic capacitors and polymer solid capacitors ensure perfect voltage smoothing and minimum residual ripple. In short: the performance values of the formula are first-class in every respect.
In the case of protection circuits, BitFenix is determined to prevent damage to other components of the computer in all cases. The protective circuit package is complete with protection against overload (OPP), overheating (OTP), overvoltage and undervoltage (OVP, UVP), short-circuit (SCP) and overcurrent (OCP). In addition, BitFenix relies on optimised multi-rail technology. The 550 Watt model has three separately fused, but single main transformer powered +12 Volt rails. Combined with the appropriate trip values for each of the rails, the manufacturer combines optimum safety with unrestricted suitability for demanding components and overclocking. In addition, the power supply units of the Formula series are protected against interference from the mains by generously proportioned filters, inrush current limiters and a varistor as primary overvoltage protection (SIP). Load-free operation is also possible (NLO).
Modern electronics with high-quality components have yet another advantage: BitFenix finds it easy to demonstrate confidence in its own products: the manufacturer's warranty for the Whisper series is a full five years. Buyers of this power supply are therefore not only getting the best performance today, but also outstanding reliability for a very long period of time. In the unlikely event of technical problems, customer service is available in English and German.
To ensure that the BF-550G's enormous performance also reaches the components, BitFenix provides sufficient connections. The connection is made with completely black ribbon-style cables of sufficient length for optically pleasing cable laying, even in large housings: the 4+4 pin connection is, for example, a whole 65 cm long. The ATX main connector and the graphics card connector have equally generous room for manoeuvre with 60 centimetres and 55 centimetres respectively. A total of two 6+2 pin PCIe connectors and two Molex and six SATA connectors are available. The ATX cable is additionally equipped with electrolytic capacitors, which on the one hand decouple disturbing interferences, smooth the voltage and on the other hand serve as a buffer for sudden load peaks in the supply voltage - an ideal power supply for overclockers and modders.
- Dimensions: 150 x 86 x 140 mm (W x H x D)
- Fans: 120 mm (FDB bearings, automatic control with particularly low RPM)
- Colour: Black (PSU, fan)
- Efficiency: minimum 91/90/88 % at 50/20/100 % load (115 Volt input voltage; efficiency up to 2% higher at the 230V common in Europe), 80 Plus Gold Certification
- Active PFC
- Form Factor: ATX12V 2.4
- Performance: 550 W
+3,3V: 20 A
+5V: 20 A
+3,3V & +5V Combined: 100 W
+12V1: 25 A
+12V2: 25 A
+12V3: 30 A
+12V Combined: 550 W
-12V: 3,6 W / 0,3 A
+5Vsb: 12,5 W / 2,5 A
- Connectors (Modular):
1x 20+4-Pin ATX12V/EPS12V
1x 4+4-Pin ATX12V/EPS12V
2x 6+2-Pin PCIe
2x 4-Pin Molex
- Manufacturer's Guarantee: 5 Years