Two power supplies, same wattage printed on the box, three times the price apart. The cheap one is not cheaper because the brand is generous — it is cheaper because of what is missing inside. And what is missing only matters on the worst day your PC will ever have.
Most buyers compare SMPS units by one number: watts. That is exactly the number the cheap end of the market games hardest. The honest comparison is different. A power supply is not really a wattage product — it is an insurance product. Its real job happens on the bad day: the voltage surge, the short circuit, the overheating afternoon. The circuits that handle that day are where the money goes, and where the cheap units quietly save it.
A cheap unit's wattage is often a peak figure — what it can touch briefly, in a cool test room, when new. The continuous rating, at real Indian room temperatures, can be far lower. That is why a '450 W' budget unit can shut down under a load a quality 450 W unit handles for years.
Honest brands rate continuously, at temperature, and publish the rail breakdown. The number that matters most is the +12 V rail's capacity, because the CPU and graphics card live on it. Two boxes both saying 450 W can differ by a third on that rail.
The alphabet soup on a good unit's box is the list of bad days it survives:
OVP / UVP — over and under voltage protection: the unit shuts down instead of feeding the board a killing voltage.OCP / OPP — over current and over power: a hungry or faulty part cannot drag the unit into overload.SCP — short circuit protection: a shorted wire or component trips the unit instead of burning.OTP — over temperature: the unit saves itself on the hottest afternoon instead of cooking.Budget units routinely ship with this list trimmed — SCP only, or a fuse standing in for real circuits. Nothing on the box will tell you loudly. That silence is the saving.
Even with protections present, the parts inside set the lifespan. Capacitors — the parts that fail first in every SMPS — come in grades, with temperature ratings and hour ratings that differ by multiples. Quality units use higher-rated capacitors on the hot secondary side, heavier heatsinks and a fan that moves air quietly for years.
This is why the failure timeline differs. The pattern pages in this series — random shutdowns, sagging rails, burnt smells — are the biography of cheap components ageing in heat. You are not buying this year's performance difference. You are buying year four.
Every SMPS eventually dies. The question the price answers is: how? A protected, quality unit usually dies politely — refuses to start, or shuts down and stays down, taking nothing with it. An unprotected unit can die loudly: a voltage spike on its way out, straight into the motherboard and drives it was feeding.
That is the arithmetic the cheap price hides. Saving fifteen hundred rupees on the supply can put fifteen thousand of motherboard and data at risk on the one day the supply fails. Insurance always looks wasted until the day it is collected.
+12 V rail rating on the label photo or datasheet — not the headline watts.Before you buy, watch the video's testing method — it shows exactly how a weak unit behaves, which is what the protection circuits exist to prevent.
▶️ Watch Full VideoYes, in its honest lower tier. The office PC's risk is not load — it is the mains. Voltage swings, surges and a shorted cable are handled by the protection circuits, which are present in a brand's entry model and often missing in the cheapest unbranded units. You do not need high wattage or fancy ratings; you need the full protection list.
80 Plus certifies efficiency — how little power is wasted as heat at different loads. It is a real, tested standard, and higher efficiency means a cooler, quieter unit. But it is not a quality or protection certificate by itself. Treat it as a good sign on top of the protection list and brand, never as a substitute for them.
Not at all — protections are for the bad day, not the ordinary ones, and plenty of cheap units live quiet lives. The risk is probabilistic: ageing components, one voltage surge, one short. The honest claim is not that a cheap unit will kill your PC; it is that when its day comes, nothing inside is assigned to protect the rest of the machine.