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Radeon HD 3690/3830 vs Radeon R5 M255

Intro

The Radeon HD 3690/3830 comes with 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 comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

Compare all of that to the Radeon R5 M255, which features GPU clock speed of 940 MHz, and 2048 MB of DDR3 RAM running at 1000 MHz through a 64-bit bus. It also is comprised of 320 SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 3690/3830 should theoretically be quite a bit better 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 will be much (more or less 76%) better at anisotropic filtering 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%) better at anti-aliasing than the Radeon R5 M255, and also will be able to handle higher screen resolutions without slowing down too much. (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

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 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: Bandwidth is the max amount of data (in units of MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. 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 many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max 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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