Radeon RX 6600 XT vs R9 390 X2
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | not rated | 132 |
| Place by popularity | not in top-100 | 88 |
| Cost-effectiveness evaluation | no data | 47.15 |
| Power efficiency | no data | 19.13 |
| Architecture | GCN 2.0 (2013−2017) | RDNA 2.0 (2020−2025) |
| GPU code name | Grenada | Navi 23 |
| Market segment | Desktop | Desktop |
| Release date | 3 September 2015 (11 years ago) | 30 July 2021 (5 years ago) |
| Launch price (MSRP) | $1,399 | $379 |
Cost-effectiveness evaluation
The higher the ratio, the better. We use the manufacturer's recommended prices.
Performance to price scatter graph
Currently popular graphics cards are shown for comparison.
Detailed specifications
General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Real power consumption of some graphics cards can well exceed their nominal TDP, especially if overclocked.
| Pipelines / CUDA cores | 2560 ×2 | 2048 |
| Core clock speed | 1000 MHz | 1968 MHz |
| Boost clock speed | no data | 2589 MHz |
| Number of transistors | 6,200 million | 11,060 million |
| Manufacturing process technology | 28 nm | 7 nm |
| Power consumption (TDP) | 580 Watt | 160 Watt |
| Texture fill rate | 160.0 ×2 | 331.4 |
| Floating-point processing power | 5.12 TFLOPS ×2 | 10.6 TFLOPS |
| ROPs | 64 ×2 | 64 |
| TMUs | 160 ×2 | 128 |
| Ray Tracing Cores | no data | 32 |
| L0 Cache | no data | 512 KB |
| L1 Cache | 640 KB | 512 KB |
| L2 Cache | 1024 KB | 2 MB |
| L3 Cache | no data | 32 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 3.0 x16 | PCIe 4.0 x8 |
| Length | no data | 190 mm |
| Width | 3-slot | 2-slot |
| Supplementary power connectors | 4x 8-pin | 1x 8-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 | 8 GB ×2 | 8 GB |
| Memory bus width | 512 Bit ×2 | 128 Bit |
| Memory clock speed | 1350 MHz | 2000 MHz |
| Memory bandwidth | 345.6 GB/s ×2 | 256.0 GB/s |
| Shared memory | - | - |
| 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 | 2x DVI, 1x HDMI, 1x DisplayPort | 1x HDMI, 2x DisplayPort |
| HDMI | + | + |
API and SDK support
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (12_0) | 12.0 Ultimate (12_2) |
| Shader Model | 6.3 | 6.5 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 2.0 | 2.1 |
| Vulkan | 1.2.131 | 1.2 |
Pros & cons summary
| Recency | 3 September 2015 | 30 July 2021 |
| Chip lithography | 28 nm | 7 nm |
| Power consumption (TDP) | 580 Watt | 160 Watt |
RX 6600 XT has an age advantage of 5 years, a 75% more advanced lithography process, and 72% lower power consumption.
We couldn't decide between Radeon R9 390 X2 and Radeon RX 6600 XT. We've got no test results to judge.
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