ATI Radeon X1900 XT vs 840M
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 550 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 45.56 | no data |
| Architecture | RDNA 3.5 (2025−2026) | R500 (2005−2007) |
| GPU code name | Krackan Point | R580 |
| Market segment | Laptop | Desktop |
| Release date | March 2025 (1 year ago) | 24 January 2006 (20 years ago) |
| Launch price (MSRP) | no data | $299 |
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 | 256 | no data |
| Core clock speed | 400 MHz | 625 MHz |
| Boost clock speed | 2900 MHz | no data |
| Number of transistors | no data | 384 million |
| Manufacturing process technology | 4 nm | 90 nm |
| Power consumption (TDP) | 15 Watt | 100 Watt |
| Texture fill rate | 46.40 | 10.00 |
| ROPs | 8 | 16 |
| TMUs | 16 | 16 |
| Ray Tracing Cores | 4 | no data |
| L0 Cache | 64 KB | no data |
| L1 Cache | 64 KB | no data |
| L2 Cache | 1024 KB | no data |
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).
| Laptop size | medium sized | no data |
| Interface | PCIe 4.0 x8 | PCIe 1.0 x16 |
| Length | no data | 242 mm |
| Width | no data | 2-slot |
| Supplementary power connectors | None | 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 | System Shared | GDDR3 |
| Maximum RAM amount | System Shared | 256 MB |
| Memory bus width | System Shared | 256 Bit |
| Memory clock speed | System Shared | 725 MHz |
| Memory bandwidth | no data | 46.4 GB/s |
| Shared memory | + | - |
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 | Portable Device Dependent | 2x DVI, 1x S-Video |
API and SDK support
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 Ultimate (12_2) | 9.0c (9_3) |
| Shader Model | 6.8 | 3.0 |
| OpenGL | 4.6 | 2.1 (full) 3.0 (partial) |
| OpenCL | 2.1 | N/A |
| Vulkan | 1.4 | N/A |
Pros & cons summary
| Chip lithography | 4 nm | 90 nm |
| Power consumption (TDP) | 15 Watt | 100 Watt |
Radeon 840M has a 96% more advanced lithography process, and 85% lower power consumption.
We couldn't decide between Radeon 840M and Radeon X1900 XT. We've got no test results to judge.
Be aware that Radeon 840M is a notebook graphics card while Radeon X1900 XT is a desktop one.
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