UHD Graphics 770 vs ATI Radeon HD 4855
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | not rated | 580 |
| Place by popularity | not in top-100 | 35 |
| Power efficiency | no data | 28.14 |
| Architecture | TeraScale (2005−2013) | Generation 12.2 (2022−2023) |
| GPU code name | RV770 | Raptor Lake GT1 |
| Market segment | Desktop | Desktop |
| Release date | 3 January 2010 (14 years ago) | 27 September 2022 (2 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 | 640 | 256 |
| Core clock speed | 575 MHz | 300 MHz |
| Boost clock speed | no data | 1650 MHz |
| Number of transistors | 956 million | no data |
| Manufacturing process technology | 55 nm | 10 nm |
| Power consumption (TDP) | 110 Watt | 15 Watt |
| Texture fill rate | 18.40 | 26.40 |
| Floating-point processing power | 0.736 TFLOPS | 0.8448 TFLOPS |
| ROPs | 16 | 8 |
| TMUs | 32 | 16 |
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 2.0 x16 | Ring Bus |
| Length | 220 mm | no data |
| Width | 2-slot | IGP |
| Supplementary power connectors | 1x 6-pin | no data |
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 | System Shared |
| Maximum RAM amount | 512 MB | System Shared |
| Memory bus width | 256 Bit | System Shared |
| Memory clock speed | 900 MHz | System Shared |
| Memory bandwidth | 115.2 GB/s | no data |
| 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 | 1x DVI, 1x HDMI, 1x VGA | Motherboard Dependent |
| HDMI | + | - |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 10.1 (10_1) | 12 (12_1) |
| Shader Model | 4.1 | 6.6 |
| OpenGL | 3.3 | 4.6 |
| OpenCL | 1.1 | 3.0 |
| Vulkan | N/A | 1.3 |
Pros & cons summary
| Recency | 3 January 2010 | 27 September 2022 |
| Chip lithography | 55 nm | 10 nm |
| Power consumption (TDP) | 110 Watt | 15 Watt |
UHD Graphics 770 has an age advantage of 12 years, a 450% more advanced lithography process, and 633.3% lower power consumption.
We couldn't decide between Radeon HD 4855 and UHD Graphics 770. We've got no test results to judge.
Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.
Comparisons with similar GPUs
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