How to Choose a PSU for Your PC Without Overpaying

The short answer to how to choose a PSU for your PC is three decisions taken in order: match the wattage to what your graphics card maker recommends for the whole system, buy 80 PLUS Bronze as an absolute floor and Gold if the build is worth protecting, then check the connector list against your CPU and GPU before you pay. Modularity, fan noise and looks come after that, not before.

The power supply is the only component that can take the rest of the build with it when it fails badly. It is also the part most often trimmed to make a budget work. This guide follows the order we use on the bench: start at the graphics card, add the processor, add a sensible margin, then stop spending.

The three numbers that actually describe a power supply

Ignore the model names. Every unit in our power supply range is usefully described by three things.

• Continuous wattage. The sustained output the unit is rated to deliver, not a peak figure. A 650W unit should hold 650W hot, in a closed cabinet, in May.
• Efficiency tier. 80 PLUS white, Bronze, Gold, Platinum, or a Cybenetics grade. This governs how much of the wall power turns into heat instead of work, and it loosely tracks internal component quality.
• Connectors. How many PCIe power leads, how many EPS leads for the CPU, and whether a modern high-draw card can be fed without an adapter octopus.

A fourth thing matters in India more than the spec sheet admits: warranty length, and whether the brand has a replacement path you can actually walk into. We do not list warranty terms on our product pages, so check the printed terms or ask us before you buy. A long warranty from a brand with an Indian service desk is worth more than a marginally better efficiency badge from one without.

How to choose a PSU for a PC around your graphics card

The graphics card sets the number. Card makers publish a recommended system wattage, which already accounts for a mainstream processor, drives, fans and a margin for transient spikes. It is a minimum to respect, not a target to beat. Below are the recommended system wattages and board power figures for cards we currently stock in our graphics card range.

Two things in that table are worth pausing on. First, board power and recommended system power are not the same conversation: the RTX 4060 draws 115W but still asks for a 550W system, because the recommendation covers the whole machine plus spike headroom. Second, the same GPU chip can carry different recommendations depending on the board partner. Both RTX 4090 cards we stock share a 450W board power, but the Founders Edition is specified against an 850W system while the factory-overclocked MSI SUPRIM LIQUID X asks for 1000W. Always read the recommendation for the exact card you are buying, not the chipset.

How much headroom is sensible, and how much is waste

Once you have the card's number, sanity-check it against the processor. TDP figures across our processor range land in three broad bands: 65W for the mainstream parts like the Ryzen 5 7600 and Core i5-14400, 105W to 125W for unlocked chips like the Ryzen 7 5800X and Core i5-14600K, and 170W for the top Ryzen 9 parts such as the 7950X. Those are the rated figures, and real peak draw under an all-core load runs above them.

In practice, if you pair a 65W processor with a card asking for 550W, that recommendation already has room. If you pair a 170W processor with the same card, you are eating into the margin and should move up one size. The same applies in an un-air-conditioned Delhi summer, where everything runs hotter and less efficiently.

Treat the card maker's recommended system wattage as your floor, not your goal. Buy exactly that number if the build is finished and final. Buy one step up — 650W instead of 550W, 850W instead of 750W — if you expect to change the graphics card once before you change the whole machine.

There is a limit to this logic. Buying a 1200W unit for a 300W build does not make the machine safer or faster. Power supplies are generally at their most efficient at part load rather than at the very bottom of their range, so a wildly oversized unit spends its life in a less efficient part of its own curve, costs more, and takes up more room in the cabinet. Headroom is insurance; excess is just expense.

80 PLUS Bronze, Gold and Platinum: what the badge buys you

The 80 PLUS badge certifies how much of the power a unit draws from the wall reaches your components rather than becoming heat. The tiers — white, Bronze, Gold, Platinum — rank that efficiency, measured at fixed load points. We do not publish measured efficiency figures for the units we stock, so treat the badge as a tier ranking rather than a number you can put against your electricity bill.

Be honest about what that is worth. The electricity saved is unlikely to repay the price difference quickly. What you are actually buying with Gold is the class of components manufacturers tend to put behind that badge: better capacitors, better voltage regulation under load swings, and quieter, slower-spinning fans. That is the argument, not the power bill.

Cybenetics ratings are not 80 PLUS ratings

Two units in our range — the Corsair RM750e and the Corsair RM850x — carry a Cybenetics Gold rating rather than an 80 PLUS one. Cybenetics is an independent lab that tests efficiency across the load range instead of at a handful of fixed points, and separately certifies noise output. A Cybenetics Gold badge is a different test, not a rebranded one. It is a credible rating; just do not assume it maps one-to-one onto the 80 PLUS scale.

Modular, semi-modular or non-modular

Modularity changes nothing electrically. It changes how much unused cable you have to hide.

• Non-modular — every cable is permanently attached. Cheapest for the specification, and completely fine in a roomy mid tower. The Ant Esports VS500L, Cooler Master MWE Bronze 650 V2 and Corsair CV650 are all non-modular.
• Semi-modular — the essential motherboard and CPU cables are fixed, the PCIe and peripheral leads detach. The Ant Esports FP650B is the only semi-modular unit we stock.
• Fully modular — every cable detaches. The Corsair RM750e, Cooler Master MWE Gold 850 V2, Corsair RM850x and be quiet! Straight Power 12 are all fully modular.

Modularity earns its keep in two situations: a compact or Micro-ATX build where there is nowhere to stuff a spare cable loom, and a build with a glass side panel where you care what the inside looks like. Check the cable routing space on the product page for whatever you pick from our cabinet range before deciding you need it.

The connector check most people skip

This is where builds stall at the last step. Before you commit, confirm four things.

1. PCIe power leads. Count what your specific graphics card needs — six-pin, eight-pin, or a 12V-2x6 connector — and confirm the unit supplies that many on separate cables where the card asks for it.
2. EPS/CPU leads. A 65W processor on a Micro-ATX board is usually happy with one eight-pin. A 125W or 170W chip on an enthusiast board from our motherboard range may want two, and some boards will not post cleanly without both populated.
3. Adapters. If the card ships with a 12V-2x6 adapter that splits into multiple eight-pins, your PSU must have that many eight-pins free. Seat adapters fully; a partially seated high-current connector is a genuine fire risk, not a forum myth.
4. Cable length. In a full tower with a bottom-mounted PSU and rear routing, a short EPS cable will not reach the top of the board. Check before you cable-manage, not after.

Our product listings give wattage, efficiency and modularity but do not itemise every connector on every unit. If your card or board has an unusual requirement, message us with the exact models before ordering and we will confirm against the physical unit rather than guess.

How to choose a PSU for a budget PC without gambling

On a tight budget the temptation is to treat the PSU as the flex item. Some compromises are reasonable and some are not.

Reasonable: dropping from Gold to Bronze, dropping from fully modular to non-modular, and buying exactly the recommended wattage rather than a size up. Not reasonable: buying an uncertified no-name unit, buying a unit whose rated wattage sits below the card's recommendation, or reusing a decade-old PSU because it still turns on. Capacitors age, and an old unit that was adequate years ago is not necessarily honest about its rating today.

One more budget note: a 500W unit is genuinely enough for a machine with no discrete graphics card — an integrated-graphics processor, a board, memory and an SSD. It is not enough for any card in our range, because the lowest recommendation we stock is 550W. Do not stretch it.

Every power supply we stock, compared

Here is the full range with the builds each unit suits, based on the recommended system wattages above. Prices are at the time of writing.

One gap worth stating plainly: we currently have nothing between 850W and 1200W. If your build lands on a 900W or 1000W recommendation — the RX 7900 XTX and the liquid-cooled RTX 4090 both do — the 1200W be quiet! is the only unit in our range that clears it. That is more headroom than strictly necessary, and it costs accordingly. If that matters to your budget, tell us and we will source to the requirement rather than sell you overhead you did not ask for.

What we would buy

For an office or integrated-graphics machine with no discrete card, the Ant Esports FP650B at Rs 3,999 is the better buy than the Rs 2,199 VS500L if you think a graphics card might arrive later; if the build is genuinely final, the VS500L does the job.

For a 1080p build around an RTX 4060 or RX 7600, the FP650B is the value pick, since it is the only semi-modular unit in the range. The Cooler Master MWE Bronze 650 V2 and Corsair CV650 cover exactly the same cards at the same wattage and efficiency if you do not mind fixed cables.

For anything at 1440p on a 4070 SUPER, RX 7800 XT, 4070 Ti SUPER or RTX 5070 Ti, the Corsair RM750e is the natural fit: fully modular, and correctly sized for those recommendations rather than oversold.

At the top, the Corsair RM850x is the sensible 4080 SUPER and 4090 Founders Edition companion, with the Cooler Master MWE Gold 850 V2 as the cheaper route to the same wattage at Rs 11,499. Only step up to the be quiet! Straight Power 12 if your card's recommendation genuinely demands it. If you would rather not size any of this yourself, our prebuilt PCs ship with the power supply already matched, and every part is bench-tested before dispatch.

If you are assembling a machine part by part, put the configuration together in our PC builder and check your chosen power supply against the recommended system wattage for your card in the table above.