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Radeon HD 4890 1GB vs Radeon RX 460


Intro

The Radeon HD 4890 1GB features a GPU core speed of 1000 MHz, and the 1024 MB of GDDR5 memory runs at 975 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon RX 460, which makes use of a 14 nm design. AMD has set the core speed at 1090 MHz. The GDDR5 memory is set to run at a frequency of 1750 MHz on this model. It features 896 SPUs along with 56 Texture Address Units 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 4890 1GB 190 Watts
Difference: 115 Watts (153%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 1GB should theoretically be just a bit superior to the Radeon RX 460 in general. (explain)

Radeon HD 4890 1GB 124800 MB/sec
Radeon RX 460 112000 MB/sec
Difference: 12800 (11%)

Texel Rate

The Radeon RX 460 will be much (about 53%) more effective at texture filtering than the Radeon HD 4890 1GB. (explain)

Radeon RX 460 61040 Mtexels/sec
Radeon HD 4890 1GB 40000 Mtexels/sec
Difference: 21040 (53%)

Pixel Rate

The Radeon RX 460 should be just a bit (approximately 9%) more effective at full screen anti-aliasing than the Radeon HD 4890 1GB, and also should be able to handle higher screen resolutions while still performing well. (explain)

Radeon RX 460 17440 Mpixels/sec
Radeon HD 4890 1GB 16000 Mpixels/sec
Difference: 1440 (9%)

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 4890 1GB

Radeon RX 460

Specifications

Display Specifications

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Model Radeon HD 4890 1GB Radeon RX 460
Manufacturer AMD AMD
Year Apr 2, 2009 August 2016
Code Name RV790 XT Polaris 11
Memory 1024 MB 4096 MB
Core Speed 1000 MHz 1090 MHz
Memory Speed 3900 MHz 7000 MHz
Power (Max TDP) 190 watts 75 watts
Bandwidth 124800 MB/sec 112000 MB/sec
Texel Rate 40000 Mtexels/sec 61040 Mtexels/sec
Pixel Rate 16000 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 959 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 maximum amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Radeon HD 4890 1GB

Radeon RX 460

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