In Win Classic Series C750, C900 PSUs Now Available

During Computex 2016, In Win announced (among other things) the launch of the Classic PSU line which consists of two members, the C750 and C900. Both these units became officially available today. The C900 costs $190, and its smaller brother has a lower price tag (close to $170). As the high price tags indicate, both units belong in the high-end category.

Aside from offering an attractive look, the aluminum enclosure with the brushed hairline finish also plays a major role into the unit's cooling, because the FETs that regulate the +12V rails come in contact, through a thermal pad, with the chassis in order to lower their operational temperatures.

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LineClassic Series
ModelsC750, C900
Max. DC Output750W, 900W(respectively)
Efficiency80 Plus Platinum
ModularYes (fully)
Intel Haswell ReadyYes
Operating temperatureNo Info
ProtectionsOver Voltage Protection Under Voltage Protection Over Current Protection Short Circuit Protection Over Power Protection Over Temperature Protection
Cooling120 mm Hypro Bearing Fan
Semi-passive operationYes (Selectable)
Number of ConnectorsEPS: 1PCIe: 4
Dimensions150 x 87 x 165mm (WxHxD)
ComplianceATX12V v2.4, EPS 2.92
Warranty7 years

Strangely enough, both units share the same number of connectors. This is strange, considering the 150W difference between them. On top of that, we expected those PSUs to be equipped with at least a couple of EPS connectors, but according to the official specs, they have but one. This will definitely lead to compatibility problems with high-end mainboards that require two EPS connectors, or a combination of EPS and ATX12V connectors. Moreover, the number of PCIe connectors is low for the C900 unit.

We should note that the review sample (C900) that we have in our hands came with two EPS cables/connectors, but on its box, In Win insisted that it has only one. In the photo above, you can also see the power specifications table. Both units have four +12V rails and not a single one, as has been the trend for several years now.

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General Data
Manufacturer (OEM)In Win
Primary Side
Transient Filter6x Y caps, 3x X caps, 2x CM chokes, 1x MOV
Inrush ProtectionNTC Thermistor & Relay
Bridge Rectifier(s)2x Shindengen LL15XB60 (600 V, 15 A @ 124 °C)
APFC MOSFETS2x Infineon IPP60R125P6 (650 V, 19 A @ 100 °C, 0.125 Ohm @ 25 °C)
APFC Boost Diode1x CREE C3D10060A (600 V, 10 A @ 153 °C)
Hold-up Cap(s)2x Nippon Chemi-Con (420 V, 390 uF each or 780 uF combined, 105 °C )
Main Switchers2x Infineon IPW60R160P6 (650 V, 15 A @ 100 °C, 0.16 Ohm @ 25 °C)
APFC ControllerOn Semiconductor NCP1654
Switching ControllerChampion CM6901
TopologyPrimary side: Half-Bridge & LLC Resonant Converter Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETS4x Alpha & Omega AON6590 (40 V, 100 A @ 100 °C, 1.55 mOhm @ 125 °C)
5V & 3.3VDC-DC Converters: 8x  D528 (GA5G13) FETs PWM Controller: ANPEC APW7160A
Filtering CapacitorsElectrolytics: Nippon Chemi-Con (105 °C, KY, KZE) Polymers: Nippon Chemi-Con
Supervisor ICSITI PS223 (OVP, UVP, OCP, SCP, OTP )
Fan ModelADDA AD1212DX-A70GL (120 mm, 12 V, 0.13 A, Hypro Bearing)
5VSB Circuit
RectifierTaiwan Semiconductor TSF20U45C (45 V, 20 A)
Standby PWM ControllerExcelliance MOS EM8569D
-12V Circuit
PWM ControllerANPEC APW7174

As you can easily figure from the table above, In Win used quality parts in the new Classic series PSUs, and the build quality is high overall. Our only objection concerns the low combined capacity of the bulk caps, something that will inevitably lead to a low hold-up time. We hope, at least, that the power signal will be accurate and that it won't provide "fake" data to the system's mainboard.

The design is modern and very clean. There are no cables running around freely over the main PCB, and that's advantageous for airflow. In addition, all filtering caps are provided by Nippon Chemi-Con, and it uses both electrolytic and polymer caps.

As usual, for a Platinum efficiency PSU, an LLC resonant converter is used to boost efficiency. The primary controller is the usual aspect, a Champion CM6901 IC. 

The Hypro Bearing fan is provided by Adda. According to its maker, this type of bearing offers increased lifetime because it develops a hypro wave in the bearing's center, where the oil reservoir is located. This means that the center point of the bearing has a lower temperature compared to its outer surface, promoting the cold to hot flow circulation. The re-circulation of the lubricant and the seal prevent the oil from evaporating, thereby significantly extending the fan's lifetime. The Hypro Bearing fans have a lifetime that exceeds 50,000 hours, so according to paper specs, they last as long as the good ball-bearing ones--which are more noisy in general.

The In Win Classic C750 and C900 are available now.

Contributing Editor

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.