GPU Comparison
Select up to 2 GPUs to analyze their pricing, performance, and specifications side-by-side.
Market Value Leader
Radeon RX 6400 is the clear winner, offering 200.5% better value than Radeon R9 390.
The Radeon RX 6400 is significantly faster than the Radeon R9 390, leading by roughly 20% in our performance index. It is also the stronger value pick here, so it's the easy recommendation if your budget allows.
Maximum Capacity Reached. Remove a model to add another. (2/2)
Radeon RX 6400 vs Radeon R9 390: In-Depth Breakdown
Performance: Radeon RX 6400 vs Radeon R9 390
The Radeon RX 6400 is significantly faster, around 20% ahead of the Radeon R9 390. Both cards sit in the same broad class, well suited to entry-level 1080p.
Price & Value
Right now the Radeon RX 6400 starts at $852 AED against $2,133 AED for the Radeon R9 390. Because it's both faster and competitively priced, the Radeon RX 6400 wins on performance-per-dollar by about 201%. The Radeon RX 6400 still sits about $693 AED above its $159 AED MSRP. The Radeon R9 390 still sits about $1,804 AED above its $329 AED MSRP.
Power & Efficiency
The Radeon RX 6400 draws just 53W versus 275W for the Radeon R9 390, 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 R9 390 has more headroom for 4K textures and memory-hungry creative/AI tasks where the Radeon RX 6400's 4GB can fall short. The Radeon R9 390's memory is also faster — 384 GB/s versus 128 GB/s (512-bit vs 64-bit bus) — which helps feed the GPU at 4K and with heavy textures.
Generation & Longevity
The Radeon RX 6400 is roughly 7 years newer than the Radeon R9 390 (RDNA 2 vs GCN 2.0), so it generally benefits from a more modern architecture and longer driver-support runway.
Which should you buy: Radeon R9 390 or Radeon RX 6400?
The Radeon RX 6400 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 R9 390 if you find it at a steep discount.
Frequently Asked Questions
Is the Radeon RX 6400 better than the Radeon R9 390?
Which is better for 4K gaming, the Radeon R9 390 or the Radeon RX 6400?
Is the Radeon R9 390 worth the extra $1,281 AED over the Radeon RX 6400?
Does the Radeon R9 390 have enough VRAM advantage to matter?
Technical Specifications Comparison
Architecture & Cores
| Specification | Radeon R9 390 | Radeon RX 6400 |
|---|---|---|
| Architecture | GCN 2.0 | RDNA 2 |
| Process Node | TSMC 28nm | TSMC N6 |
| CUDA Cores (Stream Processors / Stream Processors) | 2,560✓ | 768 |
| Ray Tracing Cores | — | 12 |
Clock Speeds
| Specification | Radeon R9 390 | Radeon RX 6400 |
|---|---|---|
| Base Clock | 1,000 MHz | 1,923 MHz✓ |
| Boost Clock | 1,000 MHz | 2,321 MHz✓ |
Memory
| Specification | Radeon R9 390 | Radeon RX 6400 |
|---|---|---|
| VRAM Capacity | 8 GB✓ | 4 GB |
| Memory Type | GDDR5 | GDDR6 |
| Memory Bus | 512-bit✓ | 64-bit |
| Memory Speed | 6 Gbps | 16 Gbps✓ |
| Bandwidth | 384 GB/s✓ | 128 GB/s |
Connectivity & Power
| Specification | Radeon R9 390 | Radeon RX 6400 |
|---|---|---|
| Interface | PCIe 3.0 x16 | PCIe 4.0 x4 |
| TDP | 275 W | 53 W✓ |
| Power Connectors | 1x 6-pin + 1x 8-pin | None |
| Released | Jun 2015 | Jan 2022 |