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Radeon HD 3690/3830 vs Radeon R5 M255

Intro

The Radeon HD 3690/3830 has a clock speed of 668 MHz and a GDDR3 memory speed of 828 MHz. It also makes use of a 128-bit bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon R5 M255, which comes with a clock frequency of 940 MHz and a DDR3 memory frequency of 1000 MHz. It also makes use of a 64-bit bus, and makes use of a 28 nm design. It features 320 SPUs, 20 TAUs, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3690/3830 should be much faster than the Radeon R5 M255 in general. (explain)

Radeon HD 3690/3830 26496 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 10496 (66%)

Texel Rate

The Radeon R5 M255 is much (about 76%) more effective at AF than the Radeon HD 3690/3830. (explain)

Radeon R5 M255 18800 Mtexels/sec
Radeon HD 3690/3830 10688 Mtexels/sec
Difference: 8112 (76%)

Pixel Rate

The Radeon HD 3690/3830 will be a lot (approximately 42%) more effective at FSAA than the Radeon R5 M255, and also should be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 3690/3830 10688 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 3168 (42%)

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 3690/3830

Amazon.com

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Radeon R5 M255

Amazon.com

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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 3690/3830 Radeon R5 M255
Manufacturer AMD AMD
Year 2008 June 2014
Code Name RV670 PRO Jet Pro
Memory 256 MB 2048 MB
Core Speed 668 MHz 940 MHz
Memory Speed 1656 MHz 2000 MHz
Power (Max TDP) 75 watts (Unknown) watts
Bandwidth 26496 MB/sec 16000 MB/sec
Texel Rate 10688 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 320(64x5) 320
Texture Mapping Units 16 20
Render Output Units 16 8
Bus Type GDDR3 DDR3
Bus Width 128-bit 64-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) 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: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core 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 rate is also dependant on lots of other factors, most notably the memory bandwidth - 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 3690/3830

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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