Personal View site logo
Make sure to join PV Telegram channel! Perfect to keep up with community on your smartphone.
Can Platinum and Titanium PSUs be worse than cheaper ones?
  • Yes, they can.

    Main marketing push is efficiency. Yet beyond good Bronze PSU it is questionable, beyond Gold it is stupid.

    Rising efficiency means that you need to reduce losses in elements of PSU.

    Bronze PSU do this by going from group stabilization to DC-DC converters for 5V and 3.3V. Good Bronze PSU can have very high efficiency and use elements (mostly MOSFETS) designed for much higher load to further reduce losses.

    image

    Gold PSU is doing efficiency improvement mostly by switching to so called LLC resonant half-bridge scheme (some PSUs even use full-bridge to gain 1-2% more efficiency).

    Further progress requires to put even more beefy elements and ... actually reduce voltage quality.

    image

    Main savings start to come from reducing number of transistors switching events. The lower the PWM frequency - the higher the ripple voltage (you can compensate it with capacitors, but still).

    It is much better idea to put nice good heatsinks (very cheap extruded alu) and high quality fan and reduce it's speed a lot where possible.

    But in reality we have huge marketing expenses, certification costs, stupid idea of half/full passive modes, Japanese capacitors craze and much more of such shit.

    sa6819.jpg
    800 x 292 - 29K
    sa6818.jpg
    704 x 563 - 77K
  • 4 Replies sorted by
  • Another difference of such PSUs is on this photo:

    image

    PSU has thermistors in series connection with filter capacitors that limits inrush current during switching power supply on. Yet after it serve it's functions it still remains a resistor and slightly (very slightly!) reduce power efficiency of PSU. To reach top marketing numbers you need to add relay into circuit to go around thermistors after they served their function.

    sa6857.jpg
    456 x 255 - 27K
  • @leonbeas

    Well, my whole point to not have "favorite brand ", but look at specific models only.

    Seasonic FOCUS Plus is good, but can find lot of same quality PSUs.

    It is not problem to find good PSU in this price range and in US.