ATI Radeon HD 4855: specs and benchmarks
Summary
ATI started Radeon HD 4855 sales 3 January 2010. This is a desktop graphics card based on a TeraScale architecture and made with 55 nm manufacturing process. It is primarily aimed at gamer market. 512 MB of GDDR5 memory clocked at 0.9 GHz are supplied, and together with 256 Bit memory interface this creates a bandwidth of 115.2 GB/s.
Compatibility-wise, this is a dual-slot graphics card attached via PCIe 2.0 x16 interface. Its manufacturer default version has a length of 220 mm. 1x 6-pin power connector is required, and power consumption is at 110 Watt.
Primary details
Some basic facts about Radeon HD 4855: architecture, market segment, release date etc.
| Place in the ranking | not rated | |
| Place by popularity | not in top-100 | |
| Architecture | TeraScale (2005−2013) | |
| GPU code name | RV770 | |
| Market segment | Desktop | |
| Release date | 3 January 2010 (14 years ago) |
Detailed specifications
Radeon HD 4855's specs such as number of shaders, GPU base clock, manufacturing process, texturing and calculation speed. These parameters indirectly speak of Radeon HD 4855's performance, but for precise assessment you have to consider its benchmark and gaming test results.
| Pipelines / CUDA cores | 640 | of 21760 (GeForce RTX 5090) |
| Core clock speed | 575 MHz | of 2670 MHz (Arc B580) |
| Number of transistors | 956 million | of 208,000 million (B200 SXM 192 GB) |
| Manufacturing process technology | 55 nm | of 3 nm (Arc Graphics 140V) |
| Power consumption (TDP) | 110 Watt | of 2400 Watt (Data Center GPU Max Subsystem) |
| Texture fill rate | 18.40 | of 2,554 (Radeon Instinct MI300X) |
| Floating-point processing power | 0.736 TFLOPS | of 109.7 (GeForce RTX 5090) |
| ROPs | 16 | of 192 (GRID A100A) |
| TMUs | 32 | of 1280 (Data Center GPU Max NEXT) |
Form factor & compatibility
This section provides details about the physical dimensions of Radeon HD 4855 and its compatibility with other computer components. This information is useful when selecting a computer configuration or upgrading an existing one. For desktop graphics cards, it includes details about the interface and bus (for motherboard compatibility) and additional power connectors (for power supply compatibility).
| Interface | PCIe 2.0 x16 | |
| Length | 220 mm | |
| Width | 2-slot | |
| Supplementary power connectors | 1x 6-pin |
VRAM capacity and type
Parameters of memory installed on Radeon HD 4855: its type, size, bus, clock and resulting bandwidth. Note that GPUs integrated into processors have no dedicated memory and use a shared part of system RAM instead.
| Memory type | GDDR5 | |
| Maximum RAM amount | 512 MB | of 294912 (Radeon Instinct MI325X) |
| Memory bus width | 256 Bit | of 8192 Bit (Radeon Instinct MI250X) |
| Memory clock speed | 900 MHz | of 20000 (RTX 5000 Ada Generation Mobile) |
| Memory bandwidth | 115.2 GB/s | of 5,171 GB/s (Radeon Instinct MI300X) |
Connectivity and outputs
Types and number of video connectors present on Radeon HD 4855. As a rule, this section is relevant only for desktop reference graphics cards, since for notebook ones the availability of certain video outputs depends on the laptop model, while non-reference desktop models can (though not necessarily will) bear a different set of video ports.
| Display Connectors | 1x DVI, 1x HDMI, 1x VGA | |
| HDMI | + |
API compatibility
APIs supported by Radeon HD 4855, sometimes including their particular versions.
| DirectX | 10.1 (10_1) | |
| Shader Model | 4.1 | |
| OpenGL | 3.3 | of 4.6 (GeForce GTX 1080 Mobile) |
| OpenCL | 1.1 | |
| Vulkan | N/A |
NVIDIA equivalent
According to our data, the closest NVIDIA alternative to Radeon HD 4855 is GeForce GTX 460 SE.
Similar GPUs
Here is our recommendation of several graphics cards that are more or less close in performance to the one reviewed.
Recommended processors
These processors are most commonly used with Radeon HD 4855 according to our statistics.
