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Radeon HD 4870 X2 vs Radeon RX 460


Intro

The Radeon HD 4870 X2 has clock 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 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon RX 460, which features a clock speed of 1090 MHz and a GDDR5 memory frequency of 1750 MHz. It also features a 128-bit bus, and uses a 14 nm design. It is made up of 896 SPUs, 56 TAUs, and 16 ROPs.

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

The Radeon HD 4870 X2 should theoretically perform a lot faster than the Radeon RX 460 overall. (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%) faster with regards to AF 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 4870 X2 is a better choice, and very much so. (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: Bandwidth is the largest amount of data (measured in MB per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Radeon HD 4870 X2

Radeon RX 460

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