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Radeon HD 3870 X2 512MB vs Radeon R5 M255

Intro

The Radeon HD 3870 X2 512MB comes with a core clock frequency of 825 MHz and a GDDR3 memory speed of 900 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon R5 M255, which comes with a core clock frequency of 940 MHz and a DDR3 memory frequency of 1000 MHz. It also uses a 64-bit memory bus, and uses a 28 nm design. It is made up of 320 SPUs, 20 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3870 X2 512MB will be 620% faster than the Radeon R5 M255 overall, due to its higher data rate. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 99200 (620%)

Texel Rate

The Radeon HD 3870 X2 512MB will be a lot (more or less 40%) better at AF than the Radeon R5 M255. (explain)

Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 7600 (40%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 3870 X2 512MB is superior to the Radeon R5 M255, by a large margin. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 18880 (251%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 3870 X2 512MB

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 3870 X2 512MB Radeon R5 M255
Manufacturer AMD AMD
Year Jan 28, 2008 June 2014
Code Name R680 Jet Pro
Memory 512 MB (x2) 2048 MB
Core Speed 825 MHz (x2) 940 MHz
Memory Speed 1800 MHz (x2) 2000 MHz
Power (Max TDP) (Unknown) watts (Unknown) watts
Bandwidth 115200 MB/sec 16000 MB/sec
Texel Rate 26400 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 320(64x5) (x2) 320
Texture Mapping Units 16 (x2) 20
Render Output Units 16 (x2) 8
Bus Type GDDR3 DDR3
Bus Width 256-bit (x2) 64-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 3.0 x8
DirectX Version DirectX 10.1 DirectX 11.2
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once 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, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs 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 is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 512MB

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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