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Classic II AC 700W PSU, 80+
Classic II AC 600W PSU, 80+
Classic II AC 500W PSU, 80+
More variations available Show

Micronics Classic II AC 80+ Power Supplies

The Classic II range of power supplies from Micronics are an excellent choice for anyone looking for great quality PSU at an affordable price. They also features “After Cooling” which helps to prolong the life of the PSU.


  1. Available in 500W, 600W and 700W
  2. Less than 1W standby power consumption
  3. High efficiency 80PLUS certified
  4. Flat ribbon cabling
  5. Features “After Cooling"
  6. Ultra-quiet 120mm fan

The Classic II power supplies from Micronics are their value range. That doesn’t mean important features have been omitted. In fact all of the PSUs feature After Cooling, flat cabling and Active PFC to mention a few. They also feature less than 1W standby power consumption and are 80+ certified.

After Cooling

After Cooling is a simple but very effective feature. When the PC is switched off the fan inside the PSU will continue to rotate. This allows the internal components of the PSU to cool down much quicker than a PSU without this feature. The result of this helps to prolong the life of the PSU. The below image shows the difference between a PSU with After Cooling and one without.

Flat Cabling

The Classic II are non-modular PSUs and therefore all cabling is directly attached to the PSUs loom. The cables are all flat which reduces the amount of space they take up compared to round cabling. Flat cables also give better flexibility, allowing for a tidier and cooler PC.

Active PFC

Active Power Factor Correction (Active PFC) is basically a AC to DC convertor that controls the electrical current supplied to the PSU via pulse-width modulation (PWM). This helps to improve efficiency and minimise power loss while maximising the supplied current. It also protects the power supply by suppressing the generation of high frequencies.

Quiet 120mm Fan Cools Premium Components

The internal components of the power supply are just as impressive as the external casing. They feature a plethora of safety protection and a Magic IC Switch which provides excellent energy saving by providing 0mW when there is no PSU load. As a result the PSU is 80 PLUS certified, giving it an efficiency rating of up to 80%! And all these high quality internal component are cooled by a large 120mm quiet fan, while producing very little noise!

Show specifications and reviews for:
SpecificationsClassic II 500WClassic II 600WClassic II 700W
Power500W 600W 700W
ModularNo No No
+3.3V maximum output current22 A 22 A 22 A
+5V maximum output current22 A 22 A 22 A
+12 maximum output current37.5 A 45 A 52.5 A
Voltage220–230Vac 220–230Vac 220–230Vac
Frequency60Hz 60Hz 60Hz
Form factor ATX 12VVersion 2.4 Version 2.4 Version 2.4
80PLUS CertificationYes Yes Yes
Active PFCYes Yes Yes
ErP2013 readyYes Yes Yes
ATX-Mainboard (20+4-pin)Yes Yes Yes
PCI-Express (6+2-pin)2 2 4
P8-/P4-connector1x P8 and 2x P4 1x P8 and 2x P4 1x P8 and 2x P4
SATA Connectors6 6 6
Molex Connectors3 3 3
Floppy Connectors1 1 1
Dimensions 160 x 140 x 86mm 160 x 140 x 86mm 160 x 140 x 86mm
Warranty24 months 24 months 24 months
EAN barcode8809436060143 8809436060204 8809436060242
SpecificationsClassic II 500WClassic II 600WClassic II 700W
Power500W 600W 700W
+3.3V maximum output current22 A
+5V maximum output current22 A
+12 maximum output current37.5 A 45 A 52.5 A
Form factor ATX 12VVersion 2.4
80PLUS CertificationYes
Active PFCYes
ProtectionOVP, UVP, SCP, OPP
ErP2013 readyYes
ATX-Mainboard (20+4-pin)Yes
PCI-Express (6+2-pin)2 4
P8-/P4-connector1x P8 and 2x P4
SATA Connectors6
Molex Connectors3
Floppy Connectors1
Dimensions 160 x 140 x 86mm
Warranty24 months
EAN barcode8809436060143 8809436060204 8809436060242

Product Resources


  • Do high wattage power supplies cost more to run?

    No - the rated wattage of a power supply refers to the maximum amount of power it can deliver at full load, not how much power it uses. More powerful PSUs will consume around the same amount of power as lower powered power supplies in any given PC system, so your electricity bill will not be higher when using a more powerful power supply!

    The best way to reduce your electricity bill when using your PC is to use a more efficient power supply or make your PC consume less power by removing components which are not needed, such as extra drives and expansion cards, or by choosing a cooler-running processor or graphics card.

  • My brand new power supply doesn’t work! Am I doing something wrong?

    It’s possible that the power supply may be faulty, but here are some simple things to check. Firstly, a power supply will not work if you simply plug it in and flick the switch. The power supply will only turn on if you connect it to a working motherboard and associated items (processor, memory, video card, etc). It is actually the motherboard which tells the power supply when to switch on.

    Secondly (if applicable), check the voltage is set correctly to 115/230 volts depending on what country you are in. Thirdly, if possible it would be good to try the power supply in another PC to see if it works, or try another power supply in your PC to see if that works. You can then tell whether it is the power supply which is faulty or the actual PC itself. If all else fails, please contact us for further support, and/or return details.

  • Why should I buy a whole new PSU when I could just replace the noisy fan in my existing one?

    Virtually all the noise generated by a PC power supply originates from the cooling fan inside it, so simply replacing the fan with a quiet fan may seem an obvious way to go. However, if you are thinking about attempting this operation, please bear the following points in mind:

    1. Your existing power supply will be designed to run with a specific amount of airflow in order to adequately cool the components inside and reducing the airflow may lead to overheating and damage to the power supply and/or PC.
    2. All PC power supplies contain very high voltages and even with the power disconnected, the voltages stored in the capacitors can be easily enough to kill. It is not recommended to take the cover off any PC power supply for this reason unless you are absolutely confident of your own ability. Because of the grave dangers involved, all PC power supplies by law carry a warning label forbidding removal of the power supply case.
    3. There will be no standard PC fan connector inside the power supply to use to connect a replacement fan, and it would probably have to be soldered directly into the PCB inside the power supply, or have a specialist power connector attached. This can be a tricky operation to say the least.

    Please consider the above points very carefully before proceeding with an operation to replace the fan in your existing power supply!

  • What is PFC (Power Factor Correction)?

    If you are interested in being “green” and saving the planet, you might like to read a short explanation of how our power supplies can save energy using Active PFC (Power Factor Correction), not to be confused with Power Conversion Efficiency which is also very good in most of our PSUs. “Power Factor” is a measure of how efficiently electrical power is consumed. Ideally, Power Factor would be 1 (or 100%) and known as unity.

    Unfortunately in the real world, Power Factor is reduced by highly inductive loads down to values of 0.7 (70%) or less. This induction is caused by equipment such as small electric motors, fans, fluorescent lighting ballasts and transformers such as those in PSUs. This is bad news for the electricity generating companies who can impose a surcharge on heavy users if they have a consistently low Power Factor, as more electricity has to be produced to make up the shortfall.

    Power Factor Correction (PFC) is used in some equipment to minimise the inductive component of the electrical current. This helps to reduce the losses in the electrical supply to that equipment. Power Factor Correction capacitors are normally used to reduce induction in an electrical load, which minimises wasted energy and hence improves the efficiency of a company and reduces electricity costs.

    It is not usually practical to reach unity, i.e. Power Factor 1, and it seems that most electricity supply companies accept consumers having a Power Factor as low as 0.94 (94%) without imposing a surcharge. Unfortunately most of the cheap (and not so cheerful) PSUs tend to have a Passive PF as low as 0.75 or 75% which in a large office can lead to a PF surcharge.

    However, the good news is that most of Quiet PC’s PSUs implement a system known as Active PFC which involves some clever electronics. This means that their power factor (PF) can be as high as 0.94 or 94% (at full load), while harmful harmonic frequencies are reduced to well below legal requirements. So by using our products, you can be happy in the knowledge that you are doing your bit to save the planet!

  • How do I know what size of wattage power supply I need?

    The best answer we can give to this question is to go ahead and take an intelligent “guesstimate"! There are no hard and fast rules about what size of power supply any given PC needs as a minimum. Our advice would be that if you are replacing an existing power supply, then consider a new one at least of the same wattage as the old one. In addition, if you wish to build in a “safety margin” to allow for reliable running and possible future upgrades, consider adding 100-200 watts to the rating of your existing unit.

    If you are building a new PC, most customers now buy a power supply rated in the region of 500-800 watts depending primarily on the performance level of their graphics card(s) and number of drives to be installed. But in any event if you are unsure about which power supply would be best for your PC then please do contact us by phone or email and we will be happy to give you a specific recommendation based on your budget.

  • My new PSU came with a 24-pin connector but my motherboard needs 20 pins! Do I need an adaptor cable?

    We receive many customer enquiries about this. In fact, most of the 24-pin compatible power supplies we sell come with special motherboard connectors which can be converted to 20-pins with no additional conversion cables. All you need to do is look carefully at the connector and you will see that the end four pins can be slid off, turning the connector into a 20-pin compatible one (see below) - easy when you know how!

    Image showing how to change a power supply's 24-pin motherboard connector into a 20-pin connector by unclipping the end four-pin block
    Image showing how to change a power supply’s 24-pin motherboard connector into a 20-pin connector by unclipping the end four-pin block
  • What do the PSU safety protection abbreviations mean?

    There are many possible safety protections a PSU can have. Below is a list of what each abbreviation means. Please note, not all PSUs have all safety protections.

    OCP - Over-Current Protection

    OVP - Over Voltage Protection

    UVP - Under Voltage Protection

    SCP - Short Circuit Protection

    OPP - Over Power Protection

    OTP - Over Temperature Protection

    UL - Underwriters Laboratories, more information.

    TÜV - Technical Inspection Association, more information.

    CE - European Conformity, more information.

    FCC - Federal Communications Commission, more information.

    RoHS - Restriction of Hazardous Substances Directive, more information.

    WEE - Electronic waste, more information.

    80 PLUS - Promotes energy efficiency for PC power supplies, more information.

    ErP - Energy Related Products, more information.

    More information on certification marks can be found here.

Top Quiet Power Supplies

“It really is silent!”

“Excellent product from an excellent company. After living with a PC for many years that made so much noise it is amazing to be sat next to my new PC that makes absolutely no sound at all. All I have to do now is find a silent keyboard!

I would recommend the Quiet PC Nofan A850a Silent PC without hesitation.”

(Review via Trustpilot)