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Deepcool PQ850M Power Supply Review

The Deepcool PQ850M achieves decent performance and it is silent.

Deepcool PQ850M
(Image: © Tom's Hardware)

Tom's Hardware Verdict

The Deepcool PQ850M achieves good but not competitive overall performance. It is silent though, and it is covered by a long warranty.

Pros

  • +

    + Full power at 47 degrees Celsius

  • +

    + Tight load regulation at 12V

  • +

    + Good build quality

  • +

    + Efficient

  • +

    + Good enough ripple suppression

  • +

    + Silent operation

  • +

    + Long hold-up time

  • +

    + Low inrush current with 115V

  • +

    + Low conducted EMI

  • +

    + Fully modular

  • +

    + Enough connectors for its capacity

  • +

    + Compatible with the alternative sleep mode

  • +

    + Compact dimensions

  • +

    + 10-year warranty

Cons

  • -

    - Lacks a 12+4 pin (12VHPWR) connector

  • -

    - High inrush current with 230V

  • -

    - Mediocre transient response at 3.3V

  • -

    - Not so efficient 5VSB rail

  • -

    - Small distance between peripheral connectors

  • -

    - Weird exterior design

The Deepcool PQ850M uses a pretty good and reliable Seasonic platform, which has started to show its age, though. Thanks to its terrific CWT platform, the Corsair RM850x (2021) remains the performance king in the 850W Gold category. The weird exterior design of the PQ850 doesn't help, either. Another decent option with similar specs from Deepcool is the DQ850-M-V2L, which achieves better performance than the PQ850M, using a budget CWT platform. A revision of the PQ850M is required, featuring a 12+4 pin connector, to give it a chance for inclusion in our best PSUs article

Deepcool enriched its PSU lines with the PQ-M series, including four models with 650W to 1000W max power. All are fully modular and use the trendy Seasonic Focus Gold platform. They have compact dimensions and are equipped with a 120mm diameter fluid dynamic bearing fan provided by Hong Hua. The exterior design looks weird because of the square holes of the fan grille. The design definitely stands out from the crowd, but not in a good way, according to our taste, at least. 

This review will evaluate the second strongest member of the PQ-M line, the 850W unit, which is strong enough to support a capable gaming system. The PSU doesn't have a 12+4 pin PCIe connector, meaning that it isn't compatible with either the newest ATX spec (v3.0) or upcoming GPUs. It is not ideal to buy a PSU right now because we are in a transition phase from the previous ATX spec to the new one. 

The only graphics card, so far at least, that comes with a 12+4 pin PCIe connector is the Nvidia RTX 3090 Ti, and it has an adapter from three 6+2 PCIe to a single 12+4 PCIe. Still, you need the PSU to be as future-proof as possible, and the upcoming GPUs will utilize the extra 4-pins so that adapters won't be fully compatible. 

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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An extended, ten-year warranty covers the PQ850M, and its MSRP is set at 169 dollars, which is a fair amount given its features. It is certified as Gold by 80 PLUS and Platinum by Cybenetics. It also has a noise rating of Cybenetics A- (25-30 dB[A]). 

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Specifications

Manufacturer (OEM)

Seasonic

Max. DC Output

850W

Efficiency80 PLUS Gold, Cybenetics Gold (87-89%)

Noise

Cybenetics A- (25-30 dB[A])

Modular

✓ (fully)

Intel C6/C7 Power State Support

Operating Temperature (Continuous Full Load)

0 - 40°C

Over Voltage Protection

Under Voltage Protection

Over Power Protection

Over Current (+12V) Protection

Over Temperature Protection

Short Circuit Protection

Surge Protection

Inrush Current Protection

Fan Failure Protection

No Load Operation

Cooling

135mm Fluid Dynamic Bearing Fan (HA13525M12F-Z)

Semi-Passive Operation

✓ (selectable)

Dimensions (W x H x D)

150 x 85 x 140mm

Weight

1.7 kg (3.75 lb)

Form Factor

ATX12V v2.53, EPS 2.92

Warranty

10 Years

Power Specifications

Rail3.3V5V12V5VSB-12V
Max. PowerAmps20207030.3
Watts100840153.6
Total Max. Power (W)850

Cables & Connectors

DescriptionCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (610mm)1118AWGNo
4+4 pin EPS12V (660mm)2218AWGNo
6+2 pin PCIe (760mm)3318AWGNo
SATA (460mm+120mm+120mm+120mm)2818AWGNo
SATA (450mm+120mm) / 4-pin Molex (+120mm+120mm)12 / 218AWGNo
4-pin Molex (450mm+120mm+120mm)1318AWGNo
AC Power Cord (1370mm) - C13 coupler1118AWG-

The only three PCIe connectors are on dedicated cables, so this PSU can even power an RTX 3090 Ti, using the provided adapter. Given that it is not wise to use PCIe cables with more than one connector and that SLI and Crossfire are long dead, there is no need for more than three PCIe connectors on dedicated cables in an 850W PSU. 

There are no in-cable caps, and all cables are long enough. If only the distance between the peripheral connectors was longer, at 150mm, at least. Finally, it would be nice to see thicker gauges on the ATX, EPS, and PCIe connectors. 

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Component Analysis

We strongly encourage you to have a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we're about to discuss.

General Data-
Manufacturer (OEM)Seasonic
PCB TypeDouble Sided
Primary Side-
Transient Filter4x Y caps, 2x X caps, 2x CM chokes, 1x MOV, 1x Champion CM02X (Discharge IC)
Inrush ProtectionNTC Thermistor MF72-5D15M (5Ohm) & Relay
Bridge Rectifier(s)
2x GBU1508 (800V, 15A @ 100°C)
APFC MOSFETs
2x Infineon IPA60R190P6 (600V, 12.7A @ 100°C, Rds(on): 0.19Ohm)
APFC Boost Diode
1x STMicronics STTH8S06D (600V, 8A)
Bulk Cap(s)
1x Nippon Chemi-Con (400V, 680uF, 2,000h @ 105°C, KMR)
Main Switchers
4x Great Power GPT13N50DG (500V, 13A, Rds(on): 0.49Ohm)
APFC Controller
Champion CM6500UNX
Resonant ControllerChampion CM6901T6
Topology
Primary side: APFC, Full-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side-
+12V MOSFETs4x Nexperia PSMN2R6-40YS (40V, 100A @ 100°C, Rds(on): 2.8mOhm)
5V & 3.3VDC-DC Converter(s)
Filtering Capacitors

Electrolytic: 2x Nippon Chemi-Con (105°C, W), 5x Nippon Chemi-Con (2-5,000h @ 105°C, KZE), 6x Nippon Chemi-Con (4-10,000h @ 105°C, KY)
Polymer: 17x FPCAP, 8x NIC, 2x no info

Supervisor ICWeltrend WT7527V (OCP, OVP, UVP, SCP, PG)
Fan ModelHong Hua HA1225H12F-Z (120mm, 12V, 0.58A, Fluid Dynamic Bearing Fan)
5VSB Circuit-
Rectifier
1x M.C.C. MBR1045ULPS SBR (45V, 10A)
Standby PWM ControllerExcelliance MOS EM8569C
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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool utilized Seasonic's trendy Focus Plus Gold design for this series. This is a good and reliable platform but not fully compatible with the newest ATX spec. The build quality is good, and as usual, Seasonic used good parts everywhere. The heat sinks are small, and there is ample space between parts for good airflow, so the Hong Hua FDB fan won't have to work over hours. 

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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The transient/EMI filter has all necessary parts, including an MOV and a discharge IC, providing a small efficiency boost. There is also an NTC thermistor for lowering inrush currents, supported by a bypass relay. 

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Deepcool PQ850M

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Deepcool PQ850M

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The pair of bridge rectifiers can handle up to 30A of current. 

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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The APFC converter uses two Infineon FETs and a single boost diode provided by STMicronics. The bulk cap is by Chemi-Con, and it has enough capacity to provide a longer than 17ms hold-up time. The APFC controller is a Champion CM6500UNX

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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The main FETs are four Great Power, installed in a full-bridge topology. An LLC resonant converter is also used to increase efficiency. The resonant controller is a Champion CM6901T6.

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Four Nexperia FETs regulate the 12V rail. Two DC-DC converters generate the minor rails. 

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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The electrolytic filtering caps are by Chemi-Con so that they will outlive the provided warranty. Lots of polymer caps are also used. 

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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The standby PWM controller is an Excelliance MOS EM8569C

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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The modular board has many polymer and two electrolytic caps. 

Deepcool PQ850M

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The main supervisor IC is a Weltrend WT7527V.

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Deepcool PQ850M

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Soldering quality is good. 

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Deepcool PQ850M

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Deepcool PQ850M

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The cooling fan measures 120mm across and it uses a fluid dynamic bearing. 

MORE: Best Power Supplies

MORE: How We Test Power Supplies

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

  • Co BIY
    This category seems to show all the competitors neck-and-neck. Are they all using the SeaSonic Gold Platform ?

    I don't mind the grid pattern and perhaps it's excellent airflow allowed for less fan.

    I think it looks particularly sharp on the back.
    Reply
  • drajitsh
    It is not ideal to buy a PSU right now because we are in a transition phase from the previous ATX spec to the new one. I am likely going to be forced to buy 2 systems for my office. They will have integrated graphics to start with and will be upgraded to low end discrete graphics in 1-2 years. Does your recommendation still stand?
    Reply
  • Co BIY
    drajitsh said:
    It is not ideal to buy a PSU right now because we are in a transition phase from the previous ATX spec to the new one. I am likely going to be forced to buy 2 systems for my office. They will have integrated graphics to start with and will be upgraded to low end discrete graphics in 1-2 years. Does your recommendation still stand?

    I don't think low end cards will be requiring the new connectors in the short term. This is a necessity only for the high end cards with crazy peak power draws.

    The makers of the low end cards will also build them to match the likely customer , you and the other 500 million people running machines without the ATX3.0 PSU upgrades.

    Question: Why are PSU's built with fan grills ? None of the other fans in PCs have grills and PSU fans aren't bigger or faster . Also readily replaceable fans could be a great selling point because users want to mod.
    Reply
  • Tom Sunday
    The old story...eveyone wants a piece of the pie! Deepcool once dedicated exclusively for PC cooling now into PSU's as well. Next we have Seasonic making memory. I wish that companies would perfect theiroriginally intended product line and giving us those results, instead of just plastering their nane on products made by others. I have no respect for this as it is a quick fix to make more money and even having some people believe that they have a better product when this is absolutely not the case .
    Reply
  • Co BIY
    Tom Sunday said:
    The old story...eveyone wants a piece of the pie! Deepcool once dedicated exclusively for PC cooling now into PSU's as well. Next we have Seasonic making memory. I wish that companies would perfect their originally intended product line and giving us those results, instead of just plastering their nane on products made by others. I have no respect for this as it is a quick fix to make more money and even having some people believe that they have a better product when this is absolutely not the case .

    I agree with you if they just slap their "Premium" name and a few RGB's to something of below average quality and then throw it out there at a Premium price.

    In this case they started with a very solid platform, executed it competently and it delivers the goods quietly.

    This PSU doesn't seem like it's worth getting the pitchforks out for.
    Reply
  • Tom Sunday
    Co BIY said:
    This PSU doesn't seem like it's worth getting the pitchforks out for.

    Yes you are on the point as always! My other 'Deepcool' thought and great hope was that someday perhaps air-cooling products will equal the thermal performance of AIO’s. In part many users even with extensive experience sometimes have trouble installing AIO’s into their case. Of course for the time being the sheer profits (or in Asetek’s case the patent license fees to other manufacturers) by keeping on manufacturing AIO’s is much more profitable. Hence perhaps stifling the development or serious further $$$ investments into the ‘inventiveness’ of air-cooling. Amazing though the AIO Asetek patent, filed in November 2004 has never been significantly improved upon and just basically copied over and over again. Of course and just perhaps further CPU development in the years ahead may offer whereby no CPU cooling will ever be necessary. That would of course be the best of both worlds!
    Reply
  • Co BIY
    Tom Sunday said:
    Yes you are on the point as always!

    Thank You for the compliment!

    Tom Sunday said:
    My other 'Deepcool' thought and great hope was that someday perhaps air-cooling products will equal the thermal performance of AIO’s. In part many users even with extensive experience sometimes have trouble installing AIO’s into their case.

    I agree with you that the simplicity, reliability and cost advantages of air cooling justify continued development. Lenovo has an interesting offset stacked air cooler design on their new Threadripper workstations that I would like to see make it to the DIY market .


    Lenovo Thinkstation P620 Review (at Anandtech)
    Reply