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Radeon HD 3850 1GB vs Radeon R5 M255

Intro

The Radeon HD 3850 1GB comes with a core clock speed of 668 MHz and a GDDR3 memory speed of 828 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It features 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon R5 M255, which comes with a clock frequency of 940 MHz and a DDR3 memory speed of 1000 MHz. It also makes use of a 64-bit bus, and uses a 28 nm design. It is comprised of 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 3850 1GB should be a lot faster than the Radeon R5 M255 in general. (explain)

Radeon HD 3850 1GB 52992 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 36992 (231%)

Texel Rate

The Radeon R5 M255 should be much (more or less 76%) better at anisotropic filtering than the Radeon HD 3850 1GB. (explain)

Radeon R5 M255 18800 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 8112 (76%)

Pixel Rate

The Radeon HD 3850 1GB will be quite a bit (about 42%) better at AA than the Radeon R5 M255, and capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 3850 1GB 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 3850 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 3850 1GB Radeon R5 M255
Manufacturer AMD AMD
Year Nov 19, 2007 June 2014
Code Name RV670 PRO Jet Pro
Memory 1024 MB 2048 MB
Core Speed 668 MHz 940 MHz
Memory Speed 1656 MHz 2000 MHz
Power (Max TDP) 75 watts (Unknown) watts
Bandwidth 52992 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 256-bit 64-bit
Fab Process 55 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/AGP 8x 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 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 card's bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 3850 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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