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Radeon HD 4870 X2 vs Radeon RX 460


Intro

The Radeon HD 4870 X2 has core speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

Compare that to the Radeon RX 460, which comes with clock speeds of 1090 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 memory. 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 X2 350 Watts
Difference: 275 Watts (367%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 X2 will be 106% quicker than the Radeon RX 460 overall, due to its greater bandwidth. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon RX 460 112000 MB/sec
Difference: 118400 (106%)

Texel Rate

The Radeon RX 460 should be a bit (more or less 2%) more effective at texture filtering than the Radeon HD 4870 X2. (explain)

Radeon RX 460 61040 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 1040 (2%)

Pixel Rate

The Radeon HD 4870 X2 is quite a bit (more or less 38%) more effective at AA than the Radeon RX 460, and also will be capable of handling higher screen resolutions better. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
Radeon RX 460 17440 Mpixels/sec
Difference: 6560 (38%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Radeon HD 4870 X2

Radeon RX 460

Specifications

Display Specifications

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Model Radeon HD 4870 X2 Radeon RX 460
Manufacturer AMD AMD
Year Aug 12, 2008 August 2016
Code Name R700 Polaris 11
Memory 1024 MB (x2) 4096 MB
Core Speed 750 MHz (x2) 1090 MHz
Memory Speed 3600 MHz (x2) 7000 MHz
Power (Max TDP) 350 watts 75 watts
Bandwidth 230400 MB/sec 112000 MB/sec
Texel Rate 60000 Mtexels/sec 61040 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 17440 Mpixels/sec
Unified Shaders 800(160x5) (x2) 896
Texture Mapping Units 40 (x2) 56
Render Output Units 16 (x2) 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 14 nm
Transistors 956 million 3000 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 12.0
OpenGL Version OpenGL 3.0 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be moved past the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Radeon HD 4870 X2

Radeon RX 460

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