GPU Comparison
Select up to 2 GPUs to analyze their pricing, performance, and specifications side-by-side.
The Radeon RX 580 is significantly faster than the Radeon RX 6400, leading by roughly 29% in our performance index. It is also the stronger value pick here, so it's the easy recommendation if your budget allows.
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Radeon RX 580 vs Radeon RX 6400: In-Depth Breakdown
Performance: Radeon RX 580 vs Radeon RX 6400
The Radeon RX 580 is significantly faster, around 29% ahead of the Radeon RX 6400. Both cards sit in the same broad class, well suited to entry-level 1080p. The Radeon RX 580 packs 2,304 stream processors versus 768 on the Radeon RX 6400.
Price & Value
Right now the Radeon RX 580 starts at $137 GBP against $174 GBP for the Radeon RX 6400. Because it's both faster and competitively priced, the Radeon RX 580 wins on performance-per-dollar by about 63%. The Radeon RX 580 is trading below its $229 GBP MSRP — a genuine deal.
Power & Efficiency
The Radeon RX 6400 draws just 53W versus 185W for the Radeon RX 580, and it also delivers more performance per watt — so it runs cooler and quieter and needs less PSU headroom. Its more modern RDNA 2 architecture on a TSMC N6 process is part of why it does more with each watt.
VRAM & Future-Proofing
With 8GB against 4GB, the Radeon RX 580 has more headroom for 4K textures and memory-hungry creative/AI tasks where the Radeon RX 6400's 4GB can fall short. The Radeon RX 580's memory is also faster — 256 GB/s versus 128 GB/s (256-bit vs 64-bit bus) — which helps feed the GPU at 4K and with heavy textures.
Generation & Longevity
The Radeon RX 6400 is roughly 5 years newer than the Radeon RX 580 (RDNA 2 vs GCN 4.0 (Polaris)), so it generally benefits from a more modern architecture and longer driver-support runway.
Which should you buy: Radeon RX 580 or Radeon RX 6400?
The Radeon RX 580 is the all-round winner here — it's faster and the better value, so buy it if it fits your budget. Only consider the Radeon RX 6400 if you find it at a steep discount.