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Radeon HD 4870 2GB vs Radeon HD 7790

Intro

The Radeon HD 4870 2GB features 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 TAUs and 16 ROPs.

Compare all that to the Radeon HD 7790, which comes with GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1500 MHz through a 128-bit bus. It also features 896 Stream Processors, 56 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
Radeon HD 4870 2GB 150 Watts
Difference: 65 Watts (76%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 2GB should be a bit faster than the Radeon HD 7790 in general. (explain)

Radeon HD 4870 2GB 115200 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 19200 (20%)

Texel Rate

The Radeon HD 7790 should be quite a bit (about 87%) faster with regards to texture filtering than the Radeon HD 4870 2GB. (explain)

Radeon HD 7790 56000 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 26000 (87%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7790 is a better choice, by a large margin. (explain)

Radeon HD 7790 16000 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 4000 (33%)

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 HD 7790

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 HD 7790
Manufacturer AMD AMD
Year Jun 25, 2008 March 2013
Code Name RV770 XT Bonaire XT
Memory 2048 MB 1024 MB
Core Speed 750 MHz 1000 MHz
Memory Speed 3600 MHz 6000 MHz
Power (Max TDP) 150 watts 85 watts
Bandwidth 115200 MB/sec 96000 MB/sec
Texel Rate 30000 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 16000 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 28 nm
Transistors 956 million 2080 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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

Display Prices

Hide Prices

Radeon HD 4870 2GB

Amazon.com

Check prices at:

Radeon HD 7790

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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