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Radeon HD 6670 (OEM) vs Radeon R5 M255

Intro

The Radeon HD 6670 (OEM) has core speeds of 800 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 RAM. It features 480 SPUs as well as 24 TAUs and 8 ROPs.

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 6670 (OEM) should be a lot faster than the Radeon R5 M255 in general. (explain)

Radeon HD 6670 (OEM) 64000 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 48000 (300%)

Texel Rate

The Radeon HD 6670 (OEM) will be just a bit (about 2%) faster with regards to AF than the Radeon R5 M255. (explain)

Radeon HD 6670 (OEM) 19200 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 400 (2%)

Pixel Rate

The Radeon R5 M255 should be a small bit (more or less 18%) faster with regards to AA than the Radeon HD 6670 (OEM), and should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R5 M255 7520 Mpixels/sec
Radeon HD 6670 (OEM) 6400 Mpixels/sec
Difference: 1120 (18%)

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 6670 (OEM)

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 6670 (OEM) Radeon R5 M255
Manufacturer AMD AMD
Year February 2011 June 2014
Code Name Turks Jet Pro
Memory 512 MB 2048 MB
Core Speed 800 MHz 940 MHz
Memory Speed 4000 MHz 2000 MHz
Power (Max TDP) 63 watts (Unknown) watts
Bandwidth 64000 MB/sec 16000 MB/sec
Texel Rate 19200 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 6400 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 480 320
Texture Mapping Units 24 20
Render Output Units 8 8
Bus Type GDDR5 DDR3
Bus Width 128-bit 64-bit
Fab Process 40 nm 28 nm
Transistors 715 million (Unknown) million
Bus PCIe 2.1 x16 PCIe 3.0 x8
DirectX Version DirectX 11 DirectX 11.2
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units of the card by the core clock 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 maximum number of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 6670 (OEM)

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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