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Radeon HD 6970 vs Radeon R5 M255

Intro

The Radeon HD 6970 comes with a core clock frequency of 880 MHz and a GDDR5 memory speed of 1375 MHz. It also features a 256-bit bus, and makes use of a 40 nm design. It is made up of 1536 SPUs, 96 TAUs, and 32 Raster Operation Units.

Compare all of that to the Radeon R5 M255, which uses a 28 nm design. AMD has set the core frequency at 940 MHz. The DDR3 memory runs at a speed of 1000 MHz on this model. It features 320 SPUs as well as 20 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 6970, in theory, should perform a lot faster than the Radeon R5 M255 overall. (explain)

Radeon HD 6970 176000 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 160000 (1000%)

Texel Rate

The Radeon HD 6970 should be quite a bit (more or less 349%) better at AF than the Radeon R5 M255. (explain)

Radeon HD 6970 84480 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 65680 (349%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6970 is superior to the Radeon R5 M255, by far. (explain)

Radeon HD 6970 28160 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 20640 (274%)

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 6970

Amazon.com

Check prices at:

Radeon R5 M255

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 6970 Radeon R5 M255
Manufacturer AMD AMD
Year December 2010 June 2014
Code Name Cayman XT Jet Pro
Memory 2048 MB 2048 MB
Core Speed 880 MHz 940 MHz
Memory Speed 5500 MHz 2000 MHz
Power (Max TDP) 250 watts (Unknown) watts
Bandwidth 176000 MB/sec 16000 MB/sec
Texel Rate 84480 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 28160 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 1536 320
Texture Mapping Units 96 20
Render Output Units 32 8
Bus Type GDDR5 DDR3
Bus Width 256-bit 64-bit
Fab Process 40 nm 28 nm
Transistors 2640 million (Unknown) million
Bus PCIe x16 PCIe 3.0 x8
DirectX Version DirectX 11 DirectX 11.2
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher 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 texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of texture units by the core 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 card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on 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 potential to get to the max fill rate.

Display Prices

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Radeon HD 6970

Amazon.com

Check prices at:

Radeon R5 M255

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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