RX 570 vs RX 580 Power Use & PSU Needs

The RX 580 draws noticeably more power than the RX 570—about 30–40W more under full load—so if you already own a 450W power supply, the RX 570 is the safer choice, while the RX 580 typically wants a 500W–550W unit. Both cards use the same Polaris architecture, but the RX 580 runs higher clocks and needs a beefier PSU to stay stable under sustained gaming.

Formula

Recommended PSU wattage = (GPU TDP + CPU TDP + Other components) × (1 + headroom percentage). The variables are:

• GPU TDP (W): the graphics card’s thermal design power—185W for the RX 580, 150W for the RX 570.
• CPU TDP (W): your processor’s rated power draw (e.g., 65W for a typical six-core).
• Other components (W): motherboard, RAM, drives, fans, RGB—usually 30–60W.
• Headroom (%): extra buffer for transient spikes and aging PSUs—20% is a common recommendation.

Worked Example

Using the defaults (RX 580 TDP 185W, CPU 65W, other 50W, 20% headroom):

1. Total system draw = 185 + 65 + 50 = 300W
2. Headroom multiplier = 1 + 20/100 = 1.20
3. Recommended PSU = 300 × 1.20 = 360W

The calculator rounds to 360W. That is the minimum recommendation for a quality unit; many builders prefer 450W–500W for quieter operation and future upgrades.

Why the RX 580 Uses More Power

Both cards are built on AMD’s 14nm Polaris 20 chip, but the RX 580 ships with higher factory clocks: base ~1257MHz vs ~1168MHz, boost ~1340MHz vs ~1244MHz. Higher clocks mean more voltage and more current, directly increasing power draw. The RX 580’s TDP is rated at 185W, while the RX 570 sits at 150W—a 35W gap. In real gaming, the difference is usually 25–40W, depending on the game and cooling.

That extra power buys roughly 10–15% more performance, but it also means more heat in your case and a higher electric bill over a year of daily use.

What Your PSU Actually Needs

Power supply ratings are not about what the card “uses” at idle—they are about peak sustained load plus transient spikes. A quality 450W PSU can run an RX 570 with a typical 65W CPU, but it leaves little room for overclocking or a power-hungry CPU like a 125W Ryzen 7. For the RX 580, AMD’s official recommendation is a 500W PSU, though many 450W units work fine if the rest of the system is modest.

Key PSU specs to check:

• +12V rail rating: most of the card’s power comes from this rail; a 450W unit should have at least 400W on +12V.
• PCIe power connectors: the RX 570 needs one 8-pin; the RX 580 typically needs one 8-pin (some models add a 6-pin).
• 80 Plus certification: not a power rating, but a sign of efficiency—a Bronze unit is fine.

Choosing Between the Two for Your PSU

If you already have a PSU, follow this quick decision path:

1. Check your PSU’s wattage and +12V rating on its label.
2. Add your CPU TDP, GPU TDP, and ~50W for other parts.
3. If the total is under 80% of the PSU’s rated wattage, either card works.
4. If you are at 85% or higher, pick the RX 570 or upgrade the PSU.

For a new build, a 550W Bronze unit is the sweet spot for the RX 580; a 450W unit is enough for the RX 570. Avoid “no-name” PSUs that overstate their capacity—stick to reputable brands and check reviews for ripple and voltage regulation.

Common Problems and Misconceptions

A frequent mistake is confusing TDP with actual power draw. TDP is a thermal design guideline, not a hard limit—the card can briefly spike above it. Another misconception is that a “500W” PSU always delivers 500W on the +12V rail; cheap units often deliver far less. If your system shuts down under load, it is usually the PSU, not the GPU.

Also, undervolting the RX 580 can reduce power draw by 20–30W with minimal performance loss—many users do this to run it on a 450W PSU. Conversely, overclocking the RX 570 can push it past 180W, negating its power advantage.

Cost and Efficiency Over Time

At 4 hours of gaming per day, the 35W difference translates to about 0.14 kWh per day. At an average electricity rate, that is roughly $5–10 per year—minor compared to the upfront price difference. However, the RX 580 runs hotter, which can shorten fan bearing life and increase case dust buildup. If your room is warm, the extra heat is noticeable.

Alternatives and Upgrades

If power efficiency is your top priority, newer cards like the GTX 1650 Super or RX 6400 draw under 100W while offering similar or better performance than the RX 570. If you need more performance than the RX 580, an RTX 2060 or RX 6600 uses less power (160W and 132W respectively) and runs cooler. For a budget build with an old PSU, the RX 570 is the pragmatic choice; for a new system, a 550W PSU plus RX 580 gives the best performance-per-dollar.

Frequently Asked Questions

Can a 450W PSU run an RX 580? Yes, with a modest CPU (65W or less) and a quality PSU with a strong +12V rail. Total system draw will be around 300W, leaving 150W headroom. Avoid overclocking and check that your PSU has an 8-pin PCIe connector.

What PSU do I need for an RX 570? A 400W unit from a reputable brand is the minimum; 450W is comfortable. With a typical 65W CPU, the system draws about 265W under load, so a 400W PSU leaves a 34% headroom.

Is the RX 580 worth the extra power? It delivers 10–15% more frames per second than the RX 570 for about 25–40W more power. If your PSU can handle it and you want higher settings at 1080p, yes. If you are on a tight PSU budget, the RX 570 is safer.

Can I use a 500W PSU for both cards? Yes, a 500W unit runs both the RX 570 and RX 580 with any mainstream CPU. It is the recommended minimum for the RX 580, and gives the RX 570 plenty of headroom for overclocking.

Does a higher wattage PSU always use more electricity? No—a PSU draws only what the components need, regardless of its rating. A 750W PSU will not increase your electric bill compared to a 450W unit; efficiency ratings matter more.

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in tdp | GPU TDP (watts) | W | 185 | 0 | 500
in cpu | CPU TDP (watts) | W | 65 | 0 | 400
in other | Other components (watts) | W | 50 | 0 | 300
in margin | PSU headroom (%) | % | 20 | 0 | 100
out psu | Recommended PSU wattage | W | (tdp + cpu + other) * (1 + margin / 100) | 0