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Radeon HD 4870 1GB vs Radeon RX 460

Intro

The Radeon HD 4870 1GB comes with a clock frequency of 750 MHz and a GDDR5 memory speed of 900 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon RX 460, which has core speeds of 1090 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 RAM. It features 896 SPUs along with 56 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 460 75 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 75 Watts (100%)

Memory Bandwidth

The Radeon HD 4870 1GB, in theory, should perform just a bit faster than the Radeon RX 460 overall. (explain)

Radeon HD 4870 1GB 115200 MB/sec
Radeon RX 460 112000 MB/sec
Difference: 3200 (3%)

Texel Rate

The Radeon RX 460 should be much (about 103%) faster with regards to AF than the Radeon HD 4870 1GB. (explain)

Radeon RX 460 61040 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 31040 (103%)

Pixel Rate

The Radeon RX 460 is quite a bit (about 45%) more effective at anti-aliasing than the Radeon HD 4870 1GB, and able to handle higher resolutions without losing too much performance. (explain)

Radeon RX 460 17440 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 5440 (45%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Radeon HD 4870 1GB

Radeon RX 460

Specifications

Display Specifications

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Model Radeon HD 4870 1GB Radeon RX 460
Manufacturer AMD AMD
Year Jun 25, 2008 August 2016
Code Name RV770 XT Polaris 11
Memory 1024 MB 4096 MB
Core Speed 750 MHz 1090 MHz
Memory Speed 3600 MHz 7000 MHz
Power (Max TDP) 150 watts 75 watts
Bandwidth 115200 MB/sec 112000 MB/sec
Texel Rate 30000 Mtexels/sec 61040 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 17440 Mpixels/sec
Unified Shaders 800(160x5) 896
Texture Mapping Units 40 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 14 nm
Transistors 956 million 3000 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 12.0
OpenGL Version OpenGL 3.0 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of information (measured in megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Radeon HD 4870 1GB

Radeon RX 460

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