ATI Radeon HD 4855 vs GeForce GTX 275
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 714 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 0.33 | no data |
| Power efficiency | 1.14 | no data |
| Architecture | Tesla 2.0 (2007−2013) | TeraScale (2005−2013) |
| GPU code name | GT200B | RV770 |
| Market segment | Desktop | Desktop |
| Release date | 15 January 2009 (15 years ago) | 3 January 2010 (14 years ago) |
| Launch price (MSRP) | $249 | no data |
Cost-effectiveness evaluation
Performance to price ratio. The higher, the better.
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 | 240 | 640 |
| Core clock speed | 633 MHz | 575 MHz |
| Number of transistors | 1,400 million | 956 million |
| Manufacturing process technology | 55 nm | 55 nm |
| Power consumption (TDP) | 219 Watt | 110 Watt |
| Maximum GPU temperature | 105 °C | no data |
| Texture fill rate | 50.64 | 18.40 |
| Floating-point processing power | 0.6739 TFLOPS | 0.736 TFLOPS |
| ROPs | 28 | 16 |
| TMUs | 80 | 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).
| Bus support | PCI-E 2.0 | no data |
| Interface | PCIe 2.0 x16 | PCIe 2.0 x16 |
| Length | 267 mm | 220 mm |
| Height | 4.376" (111 mm) (11.1 cm) | no data |
| Width | 2-slot | 2-slot |
| Supplementary power connectors | 2x 6-pin | 1x 6-pin |
| SLI options | + | - |
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 | GDDR3 | GDDR5 |
| Maximum RAM amount | 896 MB | 512 MB |
| Memory bus width | 448 Bit | 256 Bit |
| Memory clock speed | 1134 MHz | 900 MHz |
| Memory bandwidth | 127.0 GB/s | 115.2 GB/s |
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 | Two Dual Link DVI | 1x DVI, 1x HDMI, 1x VGA |
| Multi monitor support | + | no data |
| HDMI | - | + |
| Maximum VGA resolution | 2048x1536 | no data |
| Audio input for HDMI | S/PDIF | no data |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 11.1 (10_0) | 10.1 (10_1) |
| Shader Model | 4.0 | 4.1 |
| OpenGL | 3.0 | 3.3 |
| OpenCL | 1.1 | 1.1 |
| Vulkan | N/A | N/A |
| CUDA | + | - |
Pros & cons summary
| Recency | 15 January 2009 | 3 January 2010 |
| Maximum RAM amount | 896 MB | 512 MB |
| Power consumption (TDP) | 219 Watt | 110 Watt |
GTX 275 has a 75% higher maximum VRAM amount.
ATI HD 4855, on the other hand, has an age advantage of 11 months, and 99.1% lower power consumption.
We couldn't decide between GeForce GTX 275 and Radeon HD 4855. 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
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
