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Radeon HD 6970 vs Radeon R5 M255

Intro

The Radeon HD 6970 comes with clock speeds of 880 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs along with 96 TAUs and 32 ROPs.

Compare those specs to the Radeon R5 M255, which has a clock speed of 940 MHz and a DDR3 memory frequency of 1000 MHz. It also makes use of a 64-bit memory bus, and uses a 28 nm design. It is made up of 320 SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 6970, in theory, should perform much 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 will be a lot (more or less 349%) more effective 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

The Radeon HD 6970 is quite a bit (about 274%) better at full screen anti-aliasing than the Radeon R5 M255, and also will be capable of handling higher screen resolutions better. (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 maximum amount of data (in units of megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can 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 Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

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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