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Radeon HD 6970 vs Radeon R5 M255

Intro

The Radeon HD 6970 features core clock speeds of 880 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.

Compare those specs to the Radeon R5 M255, which comes with core speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 320 SPUs along with 20 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 6970 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 is much (approximately 349%) more effective at anisotropic filtering 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 high levels of AA 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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum 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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