Does your PSU actually match your GPU?
Short answer: Check three things: (1) total system wattage — add CPU TDP plus GPU TDP plus 150W overhead and multiply by 1.2; (2) the PSU's 80 Plus efficiency rating — Gold or above for gaming; (3) the brand's Indian warranty coverage. A correct PSU pairing means your desktop runs stable under full gaming load without random shutdowns, voltage sags (momentary drops in supply voltage), or long-term capacitor stress. In India, where power fluctuations are common, PSU quality is more important than in markets with cleaner grid power.
How to match a PSU to your GPU in India
Wattage math: the right calculation for Indian desktop builders
Every component in your desktop draws power from the PSU (Power Supply Unit — the box that converts AC wall power to the DC voltages your components need). The GPU (Graphics Processing Unit — the graphics card) and CPU together account for 70–85% of total system power draw at peak gaming load.
The calculation: CPU TDP + GPU TDP + 150W (for motherboard, RAM, drives, fans, and cooling) = total draw. Multiply by 1.2 to land at 80% PSU load, which is the efficiency sweet spot. Examples in India: RTX 4060 (115W) + Ryzen 5 9600X (65W) + 150W = 330W × 1.2 = 396W — a 500W Gold PSU is sufficient. RTX 4070 Ti (285W) + Core i7-14700K (125W) + 150W = 560W × 1.2 = 672W — a 750W Gold PSU is correct. RTX 4090 (450W) + Core i9-14900K (125W) = 725W × 1.2 = 870W — a 1000W Gold PSU minimum.
The 12V rail and why quality matters more than wattage stickers
The 12V rail is the primary power delivery line to your GPU and CPU. The wattage on the PSU's sticker is the claimed total output, but a poorly designed PSU may not actually deliver that wattage reliably at 12V under stress. This matters especially during the hard transient loads that GPUs create when they spike from idle to full load in milliseconds.
The quality marker to look for is the 80 Plus rating: Bronze means about 82% efficiency at 50% load; Gold means about 88%; Platinum about 92%. Higher efficiency means less heat, longer PSU life, and lower electricity cost over time. In India, where electricity costs ₹5–₹12 per unit in most states, a Gold or Platinum PSU in a gaming PC that runs 4–6 hours daily saves ₹600–₹1,500 per year in electricity versus a Bronze unit of the same wattage. Over a 5-year desktop lifespan, the PSU pays for its premium.
PSU brands with reliable Indian warranty service
Four brands dominate the reliable segment in India: Seasonic (10-year warranty on Prime Titanium series; wide online availability), Corsair (RM and HX series; excellent Indian service network through Rashi Peripherals), be quiet! (Straight Power and Pure Power lines; 5-year warranty; growing Indian presence), and Cooler Master (MWE Gold Full Modular; strong offline availability; 5-year warranty). All four use Japanese capacitors — a detail that matters for India's power fluctuation environment, as cheaper capacitors degrade faster with voltage spikes.
The segment to avoid completely: generic SMPS (Switched Mode Power Supplies) sold in computer markets at ₹600–₹1,200. These units frequently misrepresent their wattage, use low-quality capacitors, and have failed within weeks in our workshop. A budget Corsair CV650 (80+ Bronze, ₹4,500) is the absolute minimum. See also our guide on the desktop power supply buying guide for India.
India angle: voltage fluctuation and PSU protection circuits
Indian grid power frequently delivers voltages outside the nominal 230V — particularly in areas with poor distribution infrastructure. A quality PSU has multiple protection circuits: OVP (Over-Voltage Protection), UVP (Under-Voltage Protection), OCP (Over-Current Protection), and OTP (Over-Temperature Protection). These circuits prevent component damage when the grid misbehaves.
Budget PSUs skip or under-implement these protections. When the power comes back after a cut with an irregular spike, a quality PSU's OVP trips and absorbs the surge. A cheap PSU lets it through to the motherboard or GPU. This is one reason we see desktop motherboards come in for repair after power cuts more often than laptops — laptops have their own battery as a buffer. Our desktop repair service diagnoses PSU-related damage and recommends the right replacement before any other component is replaced.
Cost breakdown + when to call us
India PSU price guide by wattage and rating (as of writing)
| Wattage + Rating | Target GPU Tier | India Price (₹) |
|---|---|---|
| 500W 80+ Gold | RTX 4060 / RX 7600 | 4,500–6,500 |
| 650W 80+ Gold | RTX 4070 / RX 7700 XT | 5,500–8,500 |
| 750W 80+ Gold | RTX 4070 Ti / RX 7900 GRE | 7,000–11,000 |
| 1000W 80+ Gold | RTX 4090 / RX 7900 XTX | 10,000–18,000 |
Indicative ranges from reputable brands. Generic units at half these prices are not comparable quality.
A note from the LRW Engineer Team
The most preventable desktop damage we see on the bench is from failing cheap PSUs. The failure mode is rarely sudden — it is gradual. The PSU slowly delivers less than its rated voltage under load, the GPU throttles or crashes, and the customer assumes the GPU itself is faulty. They bring in the desktop, we swap a known-good PSU from our test bench, and the system runs perfectly. The GPU was fine the whole time. A ₹4,500 quality PSU would have saved the ₹149 diagnostic visit and the anxiety.