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Radeon HD 4890 1GB vs Radeon RX 460

Intro

The Radeon HD 4890 1GB has core clock speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

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

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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

In theory, the Radeon HD 4890 1GB is 11% quicker than the Radeon RX 460 overall, due to its higher data rate. (explain)

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

Texel Rate

The Radeon RX 460 is quite a bit (about 53%) faster with regards to anisotropic 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

If running with high levels of AA is important to you, then the Radeon RX 460 is the winner, though not by far. (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

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Radeon HD 4890 1GB

Amazon.com

Radeon RX 460

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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 max amount of data (counted in MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

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