GPU Comparison
Select up to 2 GPUs to analyze their pricing, performance, and specifications side-by-side.
Market Value Leader
Only verified data for Radeon RX 6400 is available. Benchmarks for other models are currently being processed.
The Radeon RX 7900M is dramatically faster than the Radeon RX 6400, leading by roughly 500% in our performance index.
Maximum Capacity Reached. Remove a model to add another. (2/2)
Radeon RX 7900M vs Radeon RX 6400: In-Depth Breakdown
Performance: Radeon RX 7900M vs Radeon RX 6400
The Radeon RX 7900M is dramatically faster, around 500% ahead of the Radeon RX 6400. That gap is enough to move it up a tier: the Radeon RX 7900M is comfortable at 1440p, while the Radeon RX 6400 is better matched to entry-level 1080p. The Radeon RX 7900M packs 4,608 stream processors versus 768 on the Radeon RX 6400.
Power & Efficiency
The Radeon RX 6400 pulls less power (53W vs 180W), so it's the easier card to cool and the lighter load on your PSU. The faster Radeon RX 7900M draws more overall but extracts more performance from each watt — plan for a sturdier power supply if you pick it. Its more modern RDNA 3 architecture on a TSMC N5 process is part of why it does more with each watt.
VRAM & Future-Proofing
With 16GB against 4GB, the Radeon RX 7900M 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 7900M's memory is also faster — 576 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 7900M?
The Radeon RX 7900M is the faster card by about 500%. With live pricing limited for this pair, base your decision on the spec differences above — particularly VRAM and power draw — and check current stock before buying.
Frequently Asked Questions
Is the Radeon RX 7900M better than the Radeon RX 6400?
Which is better for 4K gaming, the Radeon RX 6400 or the Radeon RX 7900M?
Does the Radeon RX 7900M have enough VRAM advantage to matter?
Technical Specifications Comparison
Architecture & Cores
| Specification | Radeon RX 6400 | Radeon RX 7900M |
|---|---|---|
| Architecture | RDNA 2 | RDNA 3 |
| Process Node | TSMC N6 | TSMC N5 |
| CUDA Cores (Stream Processors / Stream Processors) | 768 | 4,608✓ |
| Ray Tracing Cores | 12 | 72✓ |
| Tensor / AI Cores | — | 144 |
Clock Speeds
| Specification | Radeon RX 6400 | Radeon RX 7900M |
|---|---|---|
| Base Clock | 1,923 MHz✓ | 1,825 MHz |
| Boost Clock | 2,321 MHz✓ | 2,090 MHz |
Memory
| Specification | Radeon RX 6400 | Radeon RX 7900M |
|---|---|---|
| VRAM Capacity | 4 GB | 16 GB✓ |
| Memory Type | GDDR6 | GDDR6 |
| Memory Bus | 64-bit | 256-bit✓ |
| Memory Speed | 16 Gbps | 18 Gbps✓ |
| Bandwidth | 128 GB/s | 576 GB/s✓ |
Connectivity & Power
| Specification | Radeon RX 6400 | Radeon RX 7900M |
|---|---|---|
| Interface | PCIe 4.0 x4 | PCIe 4.0 x16 |
| TDP | 53 W✓ | 180 W |
| Power Connectors | None | None |
| Released | Jan 2022 | Oct 2023 |