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Radeon HD 3870 512MB vs Radeon HD 6670 (OEM) 1GB

Intro

The Radeon HD 3870 512MB comes with a GPU clock speed of 775 MHz, and the 512 MB of GDDR3 memory runs at 900 MHz through a 256-bit bus. It also features 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare all that to the Radeon HD 6670 (OEM) 1GB, which comes with a core clock frequency of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 128-bit bus, and makes use of a 40 nm design. It is comprised of 480 SPUs, 24 Texture Address Units, and 8 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB 63 Watts
Radeon HD 3870 512MB 106 Watts
Difference: 43 Watts (68%)

Memory Bandwidth

The Radeon HD 6670 (OEM) 1GB, in theory, should be a bit faster than the Radeon HD 3870 512MB in general. (explain)

Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Radeon HD 3870 512MB 57600 MB/sec
Difference: 6400 (11%)

Texel Rate

The Radeon HD 6670 (OEM) 1GB will be quite a bit (about 55%) more effective at anisotropic filtering than the Radeon HD 3870 512MB. (explain)

Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 6800 (55%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 3870 512MB is superior to the Radeon HD 6670 (OEM) 1GB, by a large margin. (explain)

Radeon HD 3870 512MB 12400 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 6000 (94%)

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

Radeon HD 3870 512MB

Amazon.com

Radeon HD 6670 (OEM) 1GB

Amazon.com

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

Model Radeon HD 3870 512MB Radeon HD 6670 (OEM) 1GB
Manufacturer AMD AMD
Year Nov 19, 2007 February 2011
Code Name RV670 XT Turks
Fab Process 55 nm 40 nm
Bus PCIe 2.0 x16/AGP 8x PCIe 2.1 x16
Memory 512 MB 1024 MB
Core Speed 775 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 900 MHz (1800 MHz effective) 1000 MHz (4000 MHz effective)
Unified Shaders 320(64x5) 480
Texture Mapping Units 16 24
Render Output Units 16 8
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1
Power (Max TDP) 106 watts 63 watts
Shader Model 4.1 5.0
Bandwidth 57600 MB/sec 64000 MB/sec
Texel Rate 12400 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 6400 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high 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 of the card by the core clock speed of the chip. The better the texel rate, the better the graphics 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 most pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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