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Radeon HD 4870 1GB vs Radeon R5 M255

Intro

The Radeon HD 4870 1GB features a clock frequency of 750 MHz and a GDDR5 memory speed of 900 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Compare that to the Radeon R5 M255, which uses a 28 nm design. AMD has clocked the core frequency at 940 MHz. The DDR3 RAM works at a frequency of 1000 MHz on this card. It features 320 SPUs along with 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4870 1GB, in theory, should be quite a bit faster than the Radeon R5 M255 in general. (explain)

Radeon HD 4870 1GB 115200 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 99200 (620%)

Texel Rate

The Radeon HD 4870 1GB should be a lot (more or less 60%) faster with regards to texture filtering than the Radeon R5 M255. (explain)

Radeon HD 4870 1GB 30000 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 11200 (60%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4870 1GB is the winner, by a large margin. (explain)

Radeon HD 4870 1GB 12000 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 4480 (60%)

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 4870 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 4870 1GB Radeon R5 M255
Manufacturer AMD AMD
Year Jun 25, 2008 June 2014
Code Name RV770 XT Jet Pro
Memory 1024 MB 2048 MB
Core Speed 750 MHz 940 MHz
Memory Speed 3600 MHz 2000 MHz
Power (Max TDP) 150 watts (Unknown) watts
Bandwidth 115200 MB/sec 16000 MB/sec
Texel Rate 30000 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 800(160x5) 320
Texture Mapping Units 40 20
Render Output Units 16 8
Bus Type GDDR5 DDR3
Bus Width 256-bit 64-bit
Fab Process 55 nm 28 nm
Transistors 956 million (Unknown) million
Bus PCIe 2.0 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 max amount of information (in units of megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 4870 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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