ATI Mobility Radeon HD 4870 vs HD 6870 X2
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | not rated | 925 |
| Place by popularity | not in top-100 | not in top-100 |
| Architecture | TeraScale 2 (2009−2015) | TeraScale (2005−2013) |
| GPU code name | Barts | M98 |
| Market segment | Desktop | Laptop |
| Release date | 8 July 2011 (14 years ago) | 9 January 2009 (16 years ago) |
| Launch price (MSRP) | $520 | no data |
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 | 1120 ×2 | 800 |
| Core clock speed | 900 MHz | 550 MHz |
| Number of transistors | 1,700 million | 956 million |
| Manufacturing process technology | 40 nm | 55 nm |
| Power consumption (TDP) | 300 Watt | no data |
| Texture fill rate | 50.40 ×2 | 22.00 |
| Floating-point processing power | 2.016 TFLOPS ×2 | 0.88 TFLOPS |
| ROPs | 32 ×2 | 16 |
| TMUs | 56 ×2 | 40 |
| L1 Cache | 224 KB | 160 KB |
| L2 Cache | 512 KB | 256 KB |
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 | no data | large |
| Interface | PCIe 2.0 x16 | PCIe 2.0 x16 |
| Length | 304 mm | no data |
| Width | 2-slot | 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 | GDDR3 |
| Maximum RAM amount | 1 GB ×2 | 512 MB |
| Memory bus width | 256 Bit ×2 | 256 Bit |
| Memory clock speed | 1050 MHz | 888 MHz |
| Memory bandwidth | 134.4 GB/s ×2 | 56.83 GB/s |
| Shared memory | - | - |
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 | 2x DVI, 1x HDMI, 2x mini-DisplayPort | No outputs |
| HDMI | + | - |
API and SDK support
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 11.2 (11_0) | 10.1 (10_1) |
| Shader Model | 5.0 | 4.1 |
| OpenGL | 4.4 | 3.3 |
| OpenCL | 1.2 | 1.1 |
| Vulkan | N/A | N/A |
Pros & cons summary
| Recency | 8 July 2011 | 9 January 2009 |
| Maximum RAM amount | 1 GB | 512 MB |
| Chip lithography | 40 nm | 55 nm |
HD 6870 X2 has an age advantage of 2 years, a 100% higher maximum VRAM amount, and a 37.5% more advanced lithography process.
We couldn't decide between Radeon HD 6870 X2 and Mobility Radeon HD 4870. We've got no test results to judge.
Be aware that Radeon HD 6870 X2 is a desktop graphics card while Mobility Radeon HD 4870 is a notebook one.
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