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Radeon HD 6870 vs Radeon RX 460


Intro

The Radeon HD 6870 features clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 1120 SPUs as well as 56 Texture Address Units and 32 ROPs.

Compare those specifications to the Radeon RX 460, which has a GPU core clock speed of 1090 MHz, and 4096 MB of GDDR5 RAM running at 1750 MHz through a 128-bit bus. It also is made up of 896 Stream Processors, 56 Texture Address Units, and 16 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon RX 460 5600 points
Radeon HD 6870 2870 points
Difference: 2730 (95%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 460 75 Watts
Radeon HD 6870 151 Watts
Difference: 76 Watts (101%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6870 should theoretically be a small bit superior to the Radeon RX 460 in general. (explain)

Radeon HD 6870 134400 MB/sec
Radeon RX 460 112000 MB/sec
Difference: 22400 (20%)

Texel Rate

The Radeon RX 460 should be quite a bit (more or less 21%) more effective at anisotropic filtering than the Radeon HD 6870. (explain)

Radeon RX 460 61040 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 10640 (21%)

Pixel Rate

The Radeon HD 6870 should be quite a bit (approximately 65%) better at anti-aliasing than the Radeon RX 460, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon RX 460 17440 Mpixels/sec
Difference: 11360 (65%)

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 6870

Radeon RX 460

Specifications

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Model Radeon HD 6870 Radeon RX 460
Manufacturer AMD AMD
Year October 2010 August 2016
Code Name Barts XT Polaris 11
Memory 1024 MB 4096 MB
Core Speed 900 MHz 1090 MHz
Memory Speed 4200 MHz 7000 MHz
Power (Max TDP) 151 watts 75 watts
Bandwidth 134400 MB/sec 112000 MB/sec
Texel Rate 50400 Mtexels/sec 61040 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 17440 Mpixels/sec
Unified Shaders 1120 896
Texture Mapping Units 56 56
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 14 nm
Transistors 1700 million 3000 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 12.0
OpenGL Version OpenGL 4.1 OpenGL 4.5

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few 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 6870

Radeon RX 460

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