ATI Radeon HD 4855 vs GeForce 840M
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 787 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 5.94 | no data |
| Architecture | Maxwell (2014−2017) | TeraScale (2005−2013) |
| GPU code name | GM108 | RV770 |
| Market segment | Laptop | Desktop |
| Release date | 12 March 2014 (10 years ago) | 3 January 2010 (14 years 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 | 640 |
| Core clock speed | 1029 MHz | 575 MHz |
| Boost clock speed | 1124 MHz | no data |
| Number of transistors | no data | 956 million |
| Manufacturing process technology | 28 nm | 55 nm |
| Power consumption (TDP) | 33 Watt | 110 Watt |
| Texture fill rate | 17.98 | 18.40 |
| Floating-point processing power | 0.8632 TFLOPS | 0.736 TFLOPS |
| ROPs | 8 | 16 |
| TMUs | 16 | 32 |
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 |
| Bus support | PCI Express 2.0, PCI Express 3.0 | no data |
| Interface | PCIe 3.0 x8 | PCIe 2.0 x16 |
| Length | no data | 220 mm |
| Width | no data | 2-slot |
| Supplementary power connectors | no data | 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 | DDR3 | GDDR5 |
| Maximum RAM amount | 4 GB | 512 MB |
| Memory bus width | 64 Bit | 256 Bit |
| Memory clock speed | 1001 MHz | 900 MHz |
| Memory bandwidth | 16.02 GB/s | 115.2 GB/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 | No outputs | 1x DVI, 1x HDMI, 1x VGA |
| HDMI | - | + |
Supported technologies
Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.
| GPU Boost | 2.0 | no data |
| Optimus | + | - |
| GameWorks | + | - |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (11_0) | 10.1 (10_1) |
| Shader Model | 5.1 | 4.1 |
| OpenGL | 4.5 | 3.3 |
| OpenCL | 1.2 | 1.1 |
| Vulkan | 1.1.126 | N/A |
| CUDA | + | - |
Pros & cons summary
| Recency | 12 March 2014 | 3 January 2010 |
| Maximum RAM amount | 4 GB | 512 MB |
| Chip lithography | 28 nm | 55 nm |
| Power consumption (TDP) | 33 Watt | 110 Watt |
GeForce 840M has an age advantage of 4 years, a 700% higher maximum VRAM amount, a 96.4% more advanced lithography process, and 233.3% lower power consumption.
We couldn't decide between GeForce 840M and Radeon HD 4855. We've got no test results to judge.
Be aware that GeForce 840M is a notebook card while Radeon HD 4855 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.
