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Thread: InWin P85

  1. #1
    Xtreme Reviewer
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    Apr 2011

    InWin P85


    When looking for a power supply as either a replacement or as part of a new system build, there are certain key features that will generally always separate the better products from those best avoided. Efficiency ratings, capacitors, and even just the basic assurance of a nice long warranty. Today's review sample is the InWin P85. This is the top member of the "P" series, with the other two members having 750W and 650W capacity. The latest designs, carry a lot of impressive features and upgrades on prior models with, of course, gold-rated efficiency ratings, fully modular, premium Japanese capacitors and a 5-year guarantee! InWin’s new fan control concept is the best choice for silent PC enthusiast. InWin believes power supply fans should not rotate as fast as they could but should be in operation as little as possible to preserve energy and create the most silent possible working environment. This is the first power supply we have ever received from be InWin, and we are excited to take a look at what they have to offer.

    The P Series comes with plenty of safety protections safeguards. These precautions are to ensure quality and a safe power usage.

    Packaging & Contents

    The front of the packaging is devoid of any huge pieces of information and instead concentrates on the major factors. These being the product name, an image of it (albeit somewhat hard to make out), the wattage and the gold-efficiency rating.

    Whatever the front lacks in the fine detail is certainly made up hugely on the rear. It is literally a wall of information and while it is a little on the small size you are told all the inner details you could want to know about this power supply.

    Logo, product name, serial number, barcode, official website on the left/right side of the outer box.

    The internals of the box are well protected by lots of packaging foam. On top of that the PSU, is wrapped in plastic.

    The paper manual is not attached, and the electronic file of the manual can be downloaded in order to reduce the use of paper.

    As a fully modular power supply giving off 850w, the InWin P85 has more than enough connections to hook up even the most complex of gaming systems. This also includes those of you who have multiple GPU and (less common) CPU set-ups. We can see a set of ATX20+4P black ribbon modular cables. The 18AWG wire length is 65 cm. A set of processor power black ribbon modular cables, provides 2 CPU12V 4+4P connectors. The 16AWG wire length to the first connector is 65 cm and the length of the 18AWG wire between the connectors is 10 cm. Two groups of graphics card power black ribbon modular cables. Each group provides 2 PCIE 6+2P connectors. The length of the 16AWG line to the first connector is 60 cm, and the length of the 18AWG line between the connectors is 10 cm. Three groups of right-angle SATA connectors with strip-shaped modular lines. Each group provides 4 right-angle SATA connectors. The length of the 18AWG line to the first connector is 55 cm, and the length of the 18AWG line between the connectors is 10 cm. A set of large 4P connector strip-shaped modular cables, providing 4 labor-saving and easy-to-pull large 4P connectors. The length of the 18AWG line to the first connector is 55 cm and the length of the 18AWG line between the connectors is 10 cm, providing a large 4P to small 4P conversion wiring.

    A Closer Look Outside

    The external build quality of InWin P85 power supply is excellent- a good indication the company is serious about the product they are selling. We will take it apart in just a moment. Fit is done well with minimal panel gaps, and all edges are nicely finished off. The level of refinement with regards to the external build quality is right up there with all the other high-quality PSUs I have used in the past. As aforementioned, we will crack open the power supply to see what components are inside in the following section.

    From our view below, you can spot be InWin's logo prominently embossed. To make sure you will always see the text right side up, the orientation of it is different on both sides, so whatever side facing the user after installation will always be correct. Meanwhile, four screws secure the power supply case together. A warranty seal extends over one edge of the power supply, so you cannot open the InWin P85 without voiding its 5-year warranty.

    Its classical SECC construction is conservative and pragmatic, and a non detachable fan grille guards the primary and only cooling fan installed. The 135mm fan generates airflow by drawing air from the bottom of the power supply over its internal components to keep the temperatures in check. The fan stops running when the output load is less than 20%, and the fan will still run for a short period of time after shutting down to help cool down.

    Exhaust heat is allowed to leave at the back of the power supply through the secondary honeycomb mesh opening. What you will find here is a vertically aligned male connector for power input on the western edge along with an on/off switch next to it. The low resistance honeycomb mesh design is implemented to maximize airflow and minimize air resistance. This is done as heat needs to leave the power supply as easily and efficiently as possible, because the P85 incorporates only one 120mm fan at the bottom. As with all active PFC power supplies, the P85 has automatic full range 100V to 240V AC line voltage selection, so the user does not have to worry about manually selecting input voltage.

    Like many power supplies we cover here at, the InWin P85 is a fully modular power supply. This means all cables are completely detachable from the main unit. While it is somewhat questionable with regards to why this is necessary, since cables such as the ATX 24-pin and ATX 4-pin/EPS 8-pin have practically an 100% chance of being always connected, it may prove to be beneficial to an extent when building your computer initially. The rear cable connection panel is done nicely. InWin has also made the labels right side up in standard orientation. Similar connectors are grouped together and are laid out in a very logical manner. To ensure you know what is going on, they are all grouped and clearly labeled for minimal ambiguity. Starting from left of our photo, we have a motherboard 24-pin split into two blocks next to each other. Next, there are two ATX/EPS 4+4 pin outputs. Three PCI Express connectors come next. Lastly, there are four peripheral headers for Molex and SATA. Incompatible outputs will not physically fit into each other, so InWin has done a great job in this regard. This is a reasonable array of outputs in correspondence number of connectors on each modular cable, which should be sufficient for casual users and power enthusiasts alike.

    The power specifications label almost entirely covers the top of the PSU. There are one main virtual rail. Up to 22A can be delivered via the +3.3V and +5V rails. The total combined output for the +3.3V and +5V rail is 120W. In other words, your power allocation combination must fall within the limits of the listed specifications. Meanwhile, the +12V rail delivers up to 70.9A combined for a total of 850W. Having a single +12V rail is important to reduce operating overhead compared to multiple +12V rails. Overall, the combined power output for the whole InWin P85 is... well, 850W.

    A Closer Look Inside

    The SIRTEC platform uses high quality parts, including Rubycon, Nippon Chemi-Con and Nichicon caps. It adopts half-bridge LLC resonance and secondary side 12V synchronous rectification, 3.3V/5V after DC-DC conversion. The design is nice, leaving lots of space on the secondary side for increased airflow. The heatsinks on the primary side are medium-sized, while the +12 V heatsinks are relatively small.

    The transient/EMI filter stages have all the necessary parts. One X capacitor and two Y capacitors are welded to the AC input socket. The X capacitor discharge IC is directly mounted on the bottom circuit board of the X capacitor. The X capacitor shell/pin, L/N circuit core, and main switch solder joints are all covered Insulating sleeve. The horizontally installed fuse at the AC input end has a covered sleeve, and the input EMI filter circuit has two common-mode inductors, an X capacitor, and two Y capacitors hidden under the X capacitor.

    Two GBU1506L bridge rectifiers in parallel configuration are installed on the heat sink, and the surge absorber installed on the left side of the rectifier is not covered with an insulating sleeve.

    APFC inductor adopts closed magnetic core structure.

    APFC adopts Rubycon MXH series 680F 400V 105℃ electrolytic capacitor. APFC power components use two TOSHIBA TK16A60W fully insulated package Power MOSFETs and a USCi UJD06506TS diode half-bridge LLC resonant converter primary side uses two TOSHIBA TK16A60W fully insulated package Power MOSFETs.

    The power management circuit and the APFC circuit are set on the same daughter card, and the optical coupling IC is used in the middle for isolated signal transmission. The APFC controller is an Infineon ICE3PCS01G, so I expect good PF readings since Infineon ICs perform better than corresponding Champion ones in this section. A vertical PCB located on the secondary side hosts the supervisor IC, a SITI PS224 that supports all protections except for OTP out of the box. The same IC provides OCP for up to two +12V rails, but this unit only has one. There is also a STC15W408AS microcontroller on the left side of PS224. It is speculated that this controller may be responsible for voltage feedback compensation control, fan low-watt stall control, and fan after shutdown. Control mechanisms such as delayed shutdown. Four Silan Microelectronics FETs are arranged into a full-bridge topology. The LLC resonant controller handling them and the +12 V FETs is the omnipresent Champion CM6901X.

    A resonant inductor and two resonant capacitors form a primary LLC resonant tank. Below the resonant capacitor is the primary current detection comparator and isolation drive transformer. The main transformer, resonant inductor and isolation drive transformer are covered with black polyester film tape. The current-converter is covered with an insulating sleeve. The empty welding position of the red frame on the far right should be equipped with an NTC thermistor to suppress the input surge current and a relay to short-circuit the NTC after the power supply is started.

    The main transformer is covered with black polyester film tape.

    The standby PWM controller is a Sanken STR-A6069H, and the auxiliary power circuit transformer on the right is covered with black polyester film tape.

    In the secondary side only Nippon Chemi-Con caps (KZE series rated at 105C) Japanese caps are used for filtering purposes. The metal heat sinks on both sides provide heat dissipation from the secondary side synchronous rectification components on the back of the circuit board.

    The common PWM controller is an ANPEC APW7159C. Both the 3.3V and 5V power stages use three Advanced Power Electronics AP3R303GMT MOSFETs, which are configured with two groups.

    Tinned on the back of the modular output socket board to increase the current-carrying capacity without covering the insulating sheet.

    On the front of the modular output socket board, some Nichicon FP series solid capacitors are placed next to the socket to enhance the output filtering effect.

    Soldering quality is satisfactory. The six fets responsible for the rectification of +12V are installed at the solder side of the main PCB and are cooled passively by the unit's case and aforementioned heatsinks. Their model number is BSC027N04LS and they are made by Infineon. A copper plate is installed between the +12V fets to provide increased conductivity. This power supply is added to the 5VSB circuit Set up two Infineon BSC0906NS MOSFETs, when the power is turned on, the 5VSB supply source will be switched from the auxiliary power circuit to the DC-DC 5V output to reduce the power consumption of the auxiliary power circuit and improve the overall conversion efficiency.

    The fan is a POWER YEAR PY-13525L12S 13.5 cm FDB bearing 12V/0.28A 1500rpm two-wire fan.

    Instrumentation used

    Below we report the instrumentation used in the test phase for the be quiet! InWin P85.

    PowerKiller 2.0. Test bench designed for power supplies up to 2185W.
    Stingray DS1M12 USB Oscilloscope
    PCE-PA 6000 Wattmeter
    Range 1W ~ 6kW
    Accuracy 1.5%
    3 x HT81
    1 x ABB Metrawatt M2004
    1 x Eldes ELD9102
    1 x Kyoritsu Kew Model 2001
    1 x EDI T053
    Scythe Kama Wireless Thermometer
    Center 325 sound level meter

    Voltage Regulation

    The voltage regulation tests are carried out by connecting all the electrical lines to our PowerKiller, simulating the behavior of the power supply with loads comparable to those of a real location.
    + 3.3V line
    Average voltage 3,281 volts
    Deviation from the ideal value (3.33 volts) = -1.45%

    + 5V line
    Average voltage 4,945 volts
    Deviation from the ideal value (5.0 volts) = -1.10%

    + 12V line
    Average voltage 12,133 volts
    Deviation from the ideal value (12.0 volts) = + 1.11%

    The average voltage value differs from the ideal one with an interval of between + or -1.5% for all three lines of interest. The voltage regulation for the InWin P85 is both amazingly solid and consistent. As you can see in the results above the level of deviancy is amazingly low while the results themselves are highly consistent.


    As this is a gold-rated efficiency power supply, it is required to meet a high standard of power efficiency. This, in basic terms, means the power that goes in versus the power that comes out. In this regard, the InWin P85 is a very solid gold-rated power supply, albeit it does ride a little close to what that requirement is. Sometimes we may see a power supply perform well beyond that remit and in this instance, gold is very-much the level here. Not that this is, in any way, a criticism. It’s doing exactly what it says it can!

    Efficiency levels are pretty solid for an 80 Plus Gold unit, hitting a peak of 93.6% at maximum efficiency. This drops to 89.6% at full load.

    Cross Load

    When you consider that EU standards allow these to go as high as 50, you’ll note that across all the ranges and loads this power supply received in our test, not once did the figure go into double digits. This is very impressive and shows that the power is being delivered very cleanly indeed!


    Cross Load

    + 3.3V line
    Maximum Vdrop 0.10 volts (3.00%)

    + 5V line
    Maximum Vdrop 0.09 volts (1.80%)

    + 12V line
    Maximum Vdrop 0.19 volts (1.55%)

    The robustness of the electronics is undoubted with voltage drops which, on average, remain contained within 2%.

    APFC & OverLoad

    The power factor control system (APFC) at full load reaches 0.98.

    We just have to push the power supply beyond the plate limits to check the overload behavior and the effectiveness of the protection systems.

    We can see a fast response from the protection system that switches off the power supply at the threshold of + 20%, with a power absorbed by the mains of 1024W and a efficiency close to 81%. As always, we reiterate that the overload test is performed by us for the sole purpose of ascertaining the goodness of the internal circuitry and protection systems, which is why we recommend choosing the power supply based on the real needs of your workstation, without making reliance on its ability to work out of specification.


    The large fan manages to keep things well under control, with the thermal overhead rising to 10c above ambient under full load conditions.


    Under lighter load situations, the fan does not spin. At around 20% load the fan starts to spin and it becomes audible around 500 watts load – but still very unobtrusive. At higher load levels the fan spins up to compensate for rising heat. At 850Watt, the fan is clearly audible.

    Final Thoughts

    Exceptional quality, both internally and externally, is the signature feature of the InWin P85. Externally, the designers made sure that the PSU will be aesthetically appealing with a modern, yet not extravagant design. The build quality is fantastic, and there are no indications that InWin have cut any manufacturing corners to hit a more competitive price point in the mid range market. Internally, InWin is using only top-quality components from known and reliable manufacturers, including using only Japanese capacitors. It is no coincidence that InWin backs this unit up with a 5-year warranty. The InWin modular cabling is top drawer and number of provided connectors is sufficient. It is great to see the peripheral connectors set adequately far apart. The P85 features a 135mm FDB fan with intelligent semi-fanless operation which makes it great for quiet home or office use. If the loading condition is below 20%, the fan will remain off for silent operation. The unit is very quiet unless you are constantly demanding in excess of 850 watts. Technically, the P85 is rock solid. Cross Load is worthy of another mention, and the efficiency levels are high, easily achieving 80 Plus Gold certification. Voltage regulation is another plus point – without any hitches in the delivery we can mention.

    Although there doesn’t appear to be many retailers stocking, InWin advertises this particular 850w model for around $147 in the US and 167 Euros in Europe. Based on comparative competitor alternatives, of which there are few that perform this well, the price is pretty decent. It may sound at this point that we’re in danger of waxing lyrical about the InWin P85 and if we are, it’s only because it really is that good! In terms of a power supply, from the most basic to advanced consumer, this is practically perfect in terms of what it offers and, more importantly, delivers. Overall, the InWin P85 easily deserves our Awesome award.

    Last edited by testman78; 08-16-2021 at 06:33 AM.



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