EVGA 450 BT PSU Review: Amazing Value At $25

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Teardown & Component Analysis

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General Data
Manufacturer (OEM)RSY (Super Flower design)
Primary Side
Transient Filter4x Y caps, 4x X caps, 2x CM chokes, 1x MOV (10D561K)
Inrush ProtectionNTC thermistor & relay
Bridge Rectifier(s)1x GBU806 (600V, 10A @ 100°C)
APFC MOSFETs2x Infineon IPA50R280CE (550V, 11.4A @ 100°C, 0.28Ω)
APFC Boost Diode1x STMicroelectronics STTH8R06D (600V, 8A @ 130°C)
Hold-up Cap(s)1x Teapo (400V, 270uF, 2000h @ 105°C, LW)
Main Switchers2x Infineon IPA50R280CE (550V, 11.4A @ 100°C, 0.28Ω)
Combo APFC/PWM ControllerON Semiconductor FAN4800C & CM03X Green PFC controller
TopologyPrimary side: Double-forward Secondary side: Passive rectification & group regulation design
Secondary Side
+12V MOSFETs2x Mospec S30M60C SBR (60V, 30A)
5V & 3.3V2x Mospec S30M45C SBR (45V, 30A)
Filtering CapacitorsElectrolytics: Teapo (1-3,000 @ 105°C, SC)
Supervisor ICGrenergy GR8323N (OVP, UVP, OCP, SCP, PG)
Fan ModelGlobe Fan S1202512L (120mm, 12V, 0.18A, 50 CFM, 34 dB[A], 2000 RPM, sleeve bearing)
5VSB Circuit
Rectifier1x Mospec S30M60C SBR (60V, 30A)
Standby PWM ControllerExcelliance EM8564A

This is an outdated Super Flower platform manufactured by RSY. We find a double-forward design on the primary side, while passive rectification and a group regulated scheme are utilized on the secondary side, tying the +12V and 5V rails together. The 3.3V rail is rectified by an independent circuit. EVGA keeps the maximum combined power of its minor rails low, enabling acceptable performance under cross-load scenarios, where the loads between rails are highly imbalanced.

It is good to see Infineon FETs in such a budget-oriented PSU. Moreover, the filtering caps are provided by Teapo, one of the best alternatives when Japanese capacitors are out of reach. We also appreciate the bypass relay that supports the NTC thermistor. However, that thermistor should be a bit larger to more effectively protect against large inrush currents.

We noticed that the MOV is rated too generously. It allows up to 925VAC to pass freely, while the bridge rectifier can handle 600V tops. An MOV with a lower clamping voltage should have been used instead.

These photos illustrate the PSU's major parts, while the following video shows its internals.

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Contributing Editor

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

  • Onus
    This looks like a decent choice for a business-class PC, or even a light gamer, which probably won't pull more than half its rated output.
  • chimera201
    Could you measure hold up at lower loads(20%, 50%, etc)?
    And why isn't inrush results included in cybenetics database?
    Normally "S" is considered higher than "A++"
  • Aris_Mp
    S stands for standard. As for the hold-up time, it is measured only in the worst case scenario, which is full load. Unfortunately there is no time to take extra measurements, especially since we want to implement some other tests.

    About the inrush current, Cyben''s pdf report covers only the basic in order to be kept at a normal size.
  • chimera201
    Just curious how the values for hold up would look like at lower loads (I know it's higher). If you do plan on testing it even once at-least do it on a cheaper PSU unit. Testing it on a higher-end unit would defeat the purpose.

    And I thought Cybenetics was supposed to give a detailed report. Not including inrush results, etc kind of defeats the purpose.
  • Aris_Mp
    The main role of Cybenetics is to provide efficiency and noise certifications. The extra results are just to let people know a little more about a PSU's quality. If Cyben provided everything then it would be a review and not a certification.
    Quality,low power PSU's are hard to find-Reason-Quality components cost money.
    Seasonic G360 or G450
    Corsair SF450
  • Marlin Schwanke
    Read the list of cons again. This thing is junk. There is no such thing as a decent $25 power supply.
  • fry178
    so more cons than pros, calling it decent build quality when almost all cons are related to quality.
    less respect with every review like this..
  • Aris_Mp
    Every product is judged based on its price.

    "Almost all cons are related to quality". Actually two our of the six have to do, in a degree, with build quality. Thin cables and overated MOV. Transient response, lower hold-up time, noise and old platform are not build quality related. Build quality has to do with the quality of the components and the craftsmanship unless you imply/understand something else.

    You know what I also call decent build quality? A PSU that has a 25C rating and manages to finish all of my tests at much higher ambient temperatures. If its components were crappy then it wouldn't even last a minute under the overload tests, as many other PSUs that have died in my hands so far.
  • fry178
    cables are still components.
    and as well as everything else, it's still directly/indirectly related to quality, no matter if physical parts or design/engineering.
    especially since this isnt a box sold by a 12y living in the grandparents basement.

    i dont expect a semi modular unit with a 140mm silent fan on this, but i doubt lots of ppl would consider this type of "quality" product, if it was anything else they are using, not even talking about the fact its a name brand that sells very good units.

    when did it start to be ok for a product to have more cons than pros?...
    doesnt make any sense to me to call it "amazing value".
    but i guess thats just me.