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Radeon HD 4870 2GB vs Radeon R9 380 4G

Intro

The Radeon HD 4870 2GB has core speeds of 750 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Compare that to the Radeon R9 380 4G, which comes with clock speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 RAM. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 2GB 150 Watts
Radeon R9 380 4G 190 Watts
Difference: 40 Watts (27%)

Memory Bandwidth

Theoretically, the Radeon R9 380 4G should be much faster than the Radeon HD 4870 2GB in general. (explain)

Radeon R9 380 4G 182400 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 67200 (58%)

Texel Rate

The Radeon R9 380 4G will be much (about 262%) faster with regards to anisotropic filtering than the Radeon HD 4870 2GB. (explain)

Radeon R9 380 4G 108640 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 78640 (262%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 380 4G is a better choice, and very much so. (explain)

Radeon R9 380 4G 31040 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 19040 (159%)

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 4870 2GB

Amazon.com

Check prices at:

Radeon R9 380 4G

Amazon.com

Check prices at:

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 4870 2GB Radeon R9 380 4G
Manufacturer AMD AMD
Year Jun 25, 2008 June 2015
Code Name RV770 XT Antigua PRO
Memory 2048 MB 4096 MB
Core Speed 750 MHz 970 MHz
Memory Speed 3600 MHz 5700 MHz
Power (Max TDP) 150 watts 190 watts
Bandwidth 115200 MB/sec 182400 MB/sec
Texel Rate 30000 Mtexels/sec 108640 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 31040 Mpixels/sec
Unified Shaders 800(160x5) 1792
Texture Mapping Units 40 112
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 28 nm
Transistors 956 million 5000 million
Bus PCIe 2.0 x16 PCIe 3.0 ×16
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 MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, 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 maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. 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 many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4870 2GB

Amazon.com

Check prices at:

Radeon R9 380 4G

Amazon.com

Check prices at:

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.

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