Radeon RX 7400 vs HD 6990
Aggregate performance score
We've compared Radeon HD 6990 and Radeon RX 7400, covering specs and all relevant benchmarks.
RX 7400 outperforms HD 6990 by a whopping 282% based on our aggregate benchmark results.
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 580 | 224 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 0.60 | no data |
| Power efficiency | 1.53 | 50.83 |
| Architecture | TeraScale 3 (2010−2013) | RDNA 3.0 (2022−2026) |
| GPU code name | Antilles | Navi 33 |
| Market segment | Desktop | Desktop |
| Release date | 8 March 2011 (14 years ago) | 8 August 2025 (less than a year ago) |
| Launch price (MSRP) | $699 | no data |
Cost-effectiveness evaluation
The higher the ratio, the better. We use the manufacturer's recommended prices.
Performance to price scatter graph
Detailed specifications
General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.
| Pipelines / CUDA cores | 1536 ×2 | 1792 |
| Core clock speed | 830 MHz | 1452 MHz |
| Boost clock speed | no data | 2300 MHz |
| Number of transistors | 2,640 million | 13,300 million |
| Manufacturing process technology | 40 nm | 6 nm |
| Power consumption (TDP) | 375 Watt | 43 Watt |
| Texture fill rate | 79.68 ×2 | 257.6 |
| Floating-point processing power | 2.55 TFLOPS ×2 | 16.49 TFLOPS |
| ROPs | 32 ×2 | 64 |
| TMUs | 96 ×2 | 112 |
| Ray Tracing Cores | no data | 28 |
| L0 Cache | no data | 448 KB |
| L1 Cache | 384 KB | 512 KB |
| L2 Cache | 512 KB | 2 MB |
| L3 Cache | no data | 64 MB |
Form factor & compatibility
Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).
| Interface | PCIe 2.0 x16 | PCIe 4.0 x8 |
| Length | 295 mm | no data |
| Width | 2-slot | 2-slot |
| Supplementary power connectors | 2x 8-pin | 1x 6-pin |
VRAM capacity and type
Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.
| Memory type | GDDR5 | GDDR6 |
| Maximum RAM amount | 2 GB ×2 | 8 GB |
| Memory bus width | 256 Bit ×2 | 128 Bit |
| Memory clock speed | 1250 MHz | 2250 MHz |
| Memory bandwidth | 160.0 GB/s ×2 | 288.0 GB/s |
| Resizable BAR | - | + |
Connectivity and outputs
This section shows the types and number of video connectors on each GPU. The data applies specifically to desktop reference models (for example, NVIDIA’s Founders Edition). OEM partners often modify both the number and types of ports. On notebook GPUs, video‐output options are determined by the laptop’s design rather than the graphics chip itself.
| Display Connectors | 1x DVI, 4x mini-DisplayPort | 1x HDMI 2.1a, 3x DisplayPort 2.1 |
| HDMI | - | + |
API and SDK support
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 11.2 (11_0) | 12 Ultimate (12_2) |
| Shader Model | 5.0 | 6.8 |
| OpenGL | 4.4 | 4.6 |
| OpenCL | 1.2 | 2.2 |
| Vulkan | N/A | 1.3 |
Synthetic benchmarks
Non-gaming benchmark results comparison. The combined score is measured on a 0-100 point scale.
Combined synthetic benchmark score
This is our combined benchmark score.
Passmark
This is the most ubiquitous GPU benchmark. It gives the graphics card a thorough evaluation under various types of load, providing four separate benchmarks for Direct3D versions 9, 10, 11 and 12 (the last being done in 4K resolution if possible), and few more tests engaging DirectCompute capabilities.
Gaming performance
Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.
Pros & cons summary
| Performance score | 7.46 | 28.47 |
| Recency | 8 March 2011 | 8 August 2025 |
| Maximum RAM amount | 2 GB | 8 GB |
| Chip lithography | 40 nm | 6 nm |
| Power consumption (TDP) | 375 Watt | 43 Watt |
RX 7400 has a 281.6% higher aggregate performance score, an age advantage of 14 years, a 300% higher maximum VRAM amount, a 566.7% more advanced lithography process, and 772.1% lower power consumption.
The Radeon RX 7400 is our recommended choice as it beats the Radeon HD 6990 in performance tests.
Other comparisons
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