Radeon RX 6900 XT vs ATI HD 4855
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | not rated | 36 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 30.42 |
| Power efficiency | no data | 16.32 |
| Architecture | TeraScale (2005−2013) | RDNA 2.0 (2020−2025) |
| GPU code name | RV770 | Navi 21 |
| Market segment | Desktop | Desktop |
| Release date | 3 January 2010 (15 years ago) | 28 October 2020 (5 years ago) |
| Launch price (MSRP) | no data | $999 |
Cost-effectiveness evaluation
The higher the ratio, the better. We use the manufacturer's recommended prices.
Performance to price scatter graph
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 | 5120 |
| Core clock speed | 575 MHz | 1825 MHz |
| Boost clock speed | no data | 2250 MHz |
| Number of transistors | 956 million | 26,800 million |
| Manufacturing process technology | 55 nm | 7 nm |
| Power consumption (TDP) | 110 Watt | 300 Watt |
| Texture fill rate | 18.40 | 720.0 |
| Floating-point processing power | 0.736 TFLOPS | 23.04 TFLOPS |
| ROPs | 16 | 128 |
| TMUs | 32 | 320 |
| Ray Tracing Cores | no data | 80 |
| L0 Cache | no data | 1.3 MB |
| L1 Cache | 128 KB | 1 MB |
| L2 Cache | 256 KB | 4 MB |
| L3 Cache | no data | 128 MB |
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 | PCIe 4.0 x16 |
| Length | 220 mm | 267 mm |
| Width | 2-slot | 3-slot |
| Supplementary power connectors | 1x 6-pin | 2x 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 | GDDR5 | GDDR6 |
| Maximum RAM amount | 512 MB | 16 GB |
| Memory bus width | 256 Bit | 256 Bit |
| Memory clock speed | 900 MHz | 2000 MHz |
| Memory bandwidth | 115.2 GB/s | 512.0 GB/s |
| Shared memory | - | - |
| Resizable BAR | - | + |
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 | 1x DVI, 1x HDMI, 1x VGA | 1x HDMI 2.1, 2x DisplayPort 1.4a, 1x USB Type-C |
| HDMI | + | + |
API and SDK support
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 10.1 (10_1) | 12 Ultimate (12_2) |
| Shader Model | 4.1 | 6.8 |
| OpenGL | 3.3 | 4.6 |
| OpenCL | 1.1 | 2.1 |
| Vulkan | N/A | 1.3 |
Pros & cons summary
| Recency | 3 January 2010 | 28 October 2020 |
| Maximum RAM amount | 512 MB | 16 GB |
| Chip lithography | 55 nm | 7 nm |
| Power consumption (TDP) | 110 Watt | 300 Watt |
ATI HD 4855 has 172.7% lower power consumption.
RX 6900 XT, on the other hand, has an age advantage of 10 years, a 3100% higher maximum VRAM amount, and a 685.7% more advanced lithography process.
We couldn't decide between Radeon HD 4855 and Radeon RX 6900 XT. We've got no test results to judge.
Other comparisons
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