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Radeon HD 3850 X2 vs Radeon R5 M255

Intro

The Radeon HD 3850 X2 uses a 55 nm design. AMD has set the core frequency at 668 MHz. The GDDR3 memory works at a frequency of 828 MHz on this specific card. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 ROPs.

Compare that to the Radeon R5 M255, which comes with GPU core speed of 940 MHz, and 2048 MB of DDR3 RAM set to run at 1000 MHz through a 64-bit bus. It also features 320 Stream Processors, 20 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3850 X2 should in theory be quite a bit faster than the Radeon R5 M255 overall. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 89984 (562%)

Texel Rate

The Radeon HD 3850 X2 should be a small bit (more or less 14%) faster with regards to anisotropic filtering than the Radeon R5 M255. (explain)

Radeon HD 3850 X2 21376 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 2576 (14%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 3850 X2 is the winner, by a large margin. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 13856 (184%)

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 3850 X2

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 3850 X2 Radeon R5 M255
Manufacturer AMD AMD
Year Apr 4, 2008 June 2014
Code Name RV670 PRO Jet Pro
Memory 512 MB (x2) 2048 MB
Core Speed 668 MHz (x2) 940 MHz
Memory Speed 1656 MHz (x2) 2000 MHz
Power (Max TDP) (Unknown) watts (Unknown) watts
Bandwidth 105984 MB/sec 16000 MB/sec
Texel Rate 21376 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 21376 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 largest amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 number of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels 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 calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3850 X2

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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