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Radeon HD 3870 X2 1GB vs Radeon R5 M255

Intro

The Radeon HD 3870 X2 1GB has a GPU core speed of 825 MHz, and the 1024 MB of GDDR4 RAM runs at 1126 MHz through a 256-bit bus. It also is made up of 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

Compare all that to the Radeon R5 M255, which features 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

The Radeon HD 3870 X2 1GB should in theory perform much faster than the Radeon R5 M255 overall. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 128128 (801%)

Texel Rate

The Radeon HD 3870 X2 1GB is quite a bit (approximately 40%) faster with regards to AF than the Radeon R5 M255. (explain)

Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 7600 (40%)

Pixel Rate

The Radeon HD 3870 X2 1GB is a lot (more or less 251%) more effective at full screen anti-aliasing than the Radeon R5 M255, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 3870 X2 1GB 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 1GB

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 1GB Radeon R5 M255
Manufacturer AMD AMD
Year Jan 28, 2008 June 2014
Code Name R680 Jet Pro
Memory 1024 MB (x2) 2048 MB
Core Speed 825 MHz (x2) 940 MHz
Memory Speed 2252 MHz (x2) 2000 MHz
Power (Max TDP) (Unknown) watts (Unknown) watts
Bandwidth 144128 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 GDDR4 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: Bandwidth is the maximum amount of data (counted in MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 3870 X2 1GB

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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