GPU Comparison
Select up to 2 GPUs to analyze their pricing, performance, and specifications side-by-side.
On raw speed the Radeon RX 7800 XT comes out dramatically faster — about 517% ahead of the Radeon RX 6400. It also wins on performance-per-dollar, making it the cleaner choice when you can afford it.
Maximum Capacity Reached. Remove a model to add another. (2/2)
Radeon RX 7800 XT vs Radeon RX 6400: In-Depth Breakdown
Performance: Radeon RX 7800 XT vs Radeon RX 6400
The Radeon RX 7800 XT is dramatically faster, around 517% ahead of the Radeon RX 6400. That gap is enough to move it up a tier: the Radeon RX 7800 XT is comfortable at 1440p, while the Radeon RX 6400 is better matched to entry-level 1080p. The Radeon RX 7800 XT packs 3,840 stream processors versus 768 on the Radeon RX 6400.
Price & Value
The Radeon RX 6400 currently lists from $175 GBP, $286 GBP less than the Radeon RX 7800 XT at $461 GBP. Because it's both faster and competitively priced, the Radeon RX 7800 XT wins on performance-per-dollar by about 134%. The Radeon RX 7800 XT is trading below its $499 GBP MSRP — a genuine deal.
Power & Efficiency
On power, the Radeon RX 6400 is the gentler choice at 53W versus 263W. The Radeon RX 7800 XT is more efficient per watt because it's faster, but its higher 263W draw means more heat and a bigger PSU. Its more modern RDNA 3 architecture on a TSMC N5 process is part of why it does more with each watt.
VRAM & Future-Proofing
The Radeon RX 7800 XT carries 16GB versus 4GB on the Radeon RX 6400. The extra 12GB helps at 4K, with high-resolution texture packs, and for content-creation or local-AI workloads that exhaust smaller buffers. The Radeon RX 7800 XT's memory is also faster — 624 GB/s versus 128 GB/s (256-bit vs 64-bit bus) — which helps feed the GPU at 4K and with heavy textures.
Which should you buy: Radeon RX 6400 or Radeon RX 7800 XT?
The Radeon RX 7800 XT 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.