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Radeon HD 4870 1GB vs Radeon HD 7790

Intro

The Radeon HD 4870 1GB features a clock frequency of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 7790, which has a clock speed of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 128-bit bus, and uses a 28 nm design. It features 896 SPUs, 56 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 65 Watts (76%)

Memory Bandwidth

The Radeon HD 4870 1GB should theoretically perform a bit faster than the Radeon HD 7790 in general. (explain)

Radeon HD 4870 1GB 115200 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 19200 (20%)

Texel Rate

The Radeon HD 7790 should be a lot (about 87%) better at texture filtering than the Radeon HD 4870 1GB. (explain)

Radeon HD 7790 56000 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 26000 (87%)

Pixel Rate

The Radeon HD 7790 will be a lot (approximately 33%) better at AA than the Radeon HD 4870 1GB, and should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 7790 16000 Mpixels/sec
Radeon HD 4870 1GB 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 1GB

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 1GB Radeon HD 7790
Manufacturer AMD AMD
Year Jun 25, 2008 March 2013
Code Name RV770 XT Bonaire XT
Memory 1024 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 maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 applied per second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 1GB

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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