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Radeon HD 7970 vs Radeon R5 M255

Intro

The Radeon HD 7970 has a core clock speed of 925 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 384-bit memory bus, and uses a 28 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

Compare those specs to the Radeon R5 M255, which features GPU core speed of 940 MHz, and 2048 MB of DDR3 RAM running at 1000 MHz through a 64-bit bus. It also features 320 SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 should be 1550% faster than the Radeon R5 M255 overall, due to its greater bandwidth. (explain)

Radeon HD 7970 264000 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 248000 (1550%)

Texel Rate

The Radeon HD 7970 is a lot (more or less 530%) more effective at texture filtering than the Radeon R5 M255. (explain)

Radeon HD 7970 118400 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 99600 (530%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7970 is a better choice, by a large margin. (explain)

Radeon HD 7970 29600 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 22080 (294%)

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 7970

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 7970 Radeon R5 M255
Manufacturer AMD AMD
Year January 2012 June 2014
Code Name Tahiti XT Jet Pro
Memory 3072 MB 2048 MB
Core Speed 925 MHz 940 MHz
Memory Speed 5500 MHz 2000 MHz
Power (Max TDP) 250 watts (Unknown) watts
Bandwidth 264000 MB/sec 16000 MB/sec
Texel Rate 118400 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 29600 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 2048 320
Texture Mapping Units 128 20
Render Output Units 32 8
Bus Type GDDR5 DDR3
Bus Width 384-bit 64-bit
Fab Process 28 nm 28 nm
Transistors 4313 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x8
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 7970

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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