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Radeon HD 7950 vs Radeon RX 470

Intro

The Radeon HD 7950 uses a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this specific card. It features 1792 SPUs as well as 112 TAUs and 32 ROPs.

Compare those specifications to the Radeon RX 470, which uses a 14 nm design. AMD has set the core speed at 926 MHz. The GDDR5 RAM runs at a speed of 1650 MHz on this specific card. It features 2048 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470 120 Watts
Radeon HD 7950 200 Watts
Difference: 80 Watts (67%)

Memory Bandwidth

Theoretically, the Radeon HD 7950 should be a bit faster than the Radeon RX 470 in general. (explain)

Radeon HD 7950 240000 MB/sec
Radeon RX 470 211200 MB/sec
Difference: 28800 (14%)

Texel Rate

The Radeon RX 470 is much (about 32%) better at anisotropic filtering than the Radeon HD 7950. (explain)

Radeon RX 470 118528 Mtexels/sec
Radeon HD 7950 89600 Mtexels/sec
Difference: 28928 (32%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon RX 470 is a better choice, though only just barely. (explain)

Radeon RX 470 29632 Mpixels/sec
Radeon HD 7950 25600 Mpixels/sec
Difference: 4032 (16%)

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 7950

Amazon.com

Radeon RX 470

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 7950 Radeon RX 470
Manufacturer AMD AMD
Year January 2012 August 2016
Code Name Tahiti Pro Polaris 10
Memory 1536 MB 8192 MB
Core Speed 800 MHz 926 MHz
Memory Speed 5000 MHz 6600 MHz
Power (Max TDP) 200 watts 120 watts
Bandwidth 240000 MB/sec 211200 MB/sec
Texel Rate 89600 Mtexels/sec 118528 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 29632 Mpixels/sec
Unified Shaders 1792 2048
Texture Mapping Units 112 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit
Fab Process 28 nm 14 nm
Transistors 4313 million 5700 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.2 OpenGL 4.5

Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 most pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock 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 rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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