Radeon RX 7990 XTX vs 660M
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 329 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 28.39 | no data |
| Architecture | RDNA 2.0 (2020−2024) | RDNA 3.0 (2022−2024) |
| GPU code name | Rembrandt+ | Navi 31 |
| Market segment | Laptop | Desktop |
| Release date | 3 January 2023 (1 year ago) | 2023 (1 year ago) |
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 | 384 | 6144 |
| Core clock speed | 1500 MHz | 2500 MHz |
| Boost clock speed | 1900 MHz | 3599 MHz |
| Number of transistors | 13,100 million | 57,700 million |
| Manufacturing process technology | 6 nm | 5 nm |
| Power consumption (TDP) | 40 Watt | 405 Watt |
| Texture fill rate | 45.60 | 1,382 |
| Floating-point processing power | 1.459 TFLOPS | 88.45 TFLOPS |
| ROPs | 16 | 192 |
| TMUs | 24 | 384 |
| Ray Tracing Cores | 6 | 96 |
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 4.0 x8 | PCIe 4.0 x16 |
| Length | no data | 287 mm |
| Width | no data | 3-slot |
| Supplementary power connectors | None | 3x 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 | System Shared | GDDR6 |
| Maximum RAM amount | System Shared | 24 GB |
| Memory bus width | System Shared | 384 Bit |
| Memory clock speed | System Shared | 3000 MHz |
| Memory bandwidth | no data | 1.15 TB/s |
| Shared memory | + | - |
Connectivity and outputs
Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.
| Display Connectors | Portable Device Dependent | 1x HDMI 2.1a, 2x DisplayPort 2.1, 1x USB Type-C |
| HDMI | - | + |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 Ultimate (12_2) | 12 Ultimate (12_2) |
| Shader Model | 6.7 | 6.7 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 2.0 | 2.2 |
| Vulkan | 1.3 | 1.3 |
Pros & cons summary
| Chip lithography | 6 nm | 5 nm |
| Power consumption (TDP) | 40 Watt | 405 Watt |
Radeon 660M has 912.5% lower power consumption.
RX 7990 XTX, on the other hand, has a 20% more advanced lithography process.
We couldn't decide between Radeon 660M and Radeon RX 7990 XTX. We've got no test results to judge.
Be aware that Radeon 660M is a notebook card while Radeon RX 7990 XTX is a desktop one.
Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.
Comparisons with similar GPUs
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
